Chandrayaan-2

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Chandrayaan-2
Chandrayaan-2 lander and orbiter integrated stack.jpg
Chandrayaan-2 composite
Mission type Lunar orbiter, lander, rover
Operator Indian Space Research Organisation (ISRO)
SATCAT no. 2019-042A
Website www.isro.gov.in/chandrayaan2-home-0
Mission durationOrbiter: ~ 7 years
Elapsed: 14 days
Vikram lander ≤ 14 days [1] [2]
Pragyan rover: ≤ 14 days [2]
Spacecraft properties
Manufacturer Indian Space Research Organisation (ISRO)
Launch massCombined (wet): 3,850 kg (8,490 lb) [3] [4] [5]
Combined (dry): 1,308 kg (2,884 lb) [6]
Orbiter (wet): 2,379 kg (5,245 lb) [4] [5]
Orbiter (dry): 682 kg (1,504 lb) [6]
Vikram lander (wet): 1,471 kg (3,243 lb) [4] [5]
Vikram lander (dry): 626 kg (1,380 lb) [6]
Pragyan rover: 27 kg (60 lb) [4] [5]
PowerOrbiter: 1 kW [7]

Vikram lander: 650 W

Pragyan rover: 50 W
Start of mission
Launch date22 July 2019, 14:43:12 IST (09:13:12 UTC) [8]
Rocket GSLV Mk III [9] [10]
Launch site Satish Dhawan Space Centre Second Launch Pad
Contractor Indian Space Research Organisation (ISRO)
Moon orbiter
Orbital insertion20 August 2019, 09:02 IST (03:32 UTC) [11] [12]
Orbital parameters
Periapsis altitude 100 km (62 mi) [13]
Apoapsis altitude 100 km (62 mi) [13]
Inclination90° (polar orbit)
Moon lander
Spacecraft component Rover
Landing date7 September 2019, 01:55 IST
(6 September 2019, 20:25 UTC) [14] [12]
 
Chandrayaan-2 mission explained

Chandrayaan-2(candra-yāna, transl."mooncraft"; [15] [16] Loudspeaker.svg pronunciation  ) is the second lunar exploration mission developed by the Indian Space Research Organisation (ISRO), [17] [18] after Chandrayaan-1. [19] [20] It consists of a lunar orbiter, the Vikram lander, and the Pragyan lunar rover, all of which were developed in India. [21] The main scientific objective is to map and study the variations in lunar surface composition, as well as the location and abundance of lunar water. [22] [23]

Exploration of the Moon various missions to the Moon

The physical exploration of the Moon began when Luna 2, a space probe launched by the Soviet Union, made an impact on the surface of the Moon on September 14, 1959. Prior to that the only available means of exploration had been observation from Earth. The invention of the optical telescope brought about the first leap in the quality of lunar observations. Galileo Galilei is generally credited as the first person to use a telescope for astronomical purposes; having made his own telescope in 1609, the mountains and craters on the lunar surface were among his first observations using it.

Indian Space Research Organisation Indias National Space Agency

The Indian Space Research Organisation is the space agency of the Government of India headquartered in the city of Bengaluru. Its vision is to "harness space technology for national development while pursuing space science research and planetary exploration". The Indian National Committee for Space Research (INCOSPAR) was established in the tenure of Jawaharlal Nehru under the Department of Atomic Energy (DAE) in 1962, with the urging of scientist Vikram Sarabhai recognizing the need in space research. INCOSPAR grew and became ISRO in 1969, also under the DAE. In 1972, Government of India setup a Space Commission and the Department of Space (DOS), bringing ISRO under the DOS. The establishment of ISRO thus institutionalized space research activities in India. It is managed by the DOS, which reports to the prime minister of India.

Contents

The mission was launched on its course to the Moon from the second launch pad at Satish Dhawan Space Centre on 22 July 2019 at 2.43 PM IST (09:13 UTC) by a Geosynchronous Satellite Launch Vehicle Mark III (GSLV Mk III). [9] [10] [24] The craft reached the Moon's orbit on 20 August 2019 and began orbital positioning manoeuvres for the landing of the Vikram lander. [25] Vikram and the rover were scheduled to land on the near side of the Moon, in the south polar region [26] at a latitude of about 70° south at approximately 20:23 UTC on 6 September 2019 and conduct scientific experiments for one lunar day, which approximates two Earth weeks.

Moon Earths natural satellite

The Moon is an astronomical body that orbits the Earth as its only permanent natural satellite. It is the fifth-largest satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits. The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known.

Satish Dhawan Space Centre Second Launch Pad launch pad in Satish Dhawan Space Centre, India

The Second Launch Pad of the Satish Dhawan Space Centre is a rocket launch site in Sriharikota, India. It is the second of two launch pads at the centre. The Second Launch Pad or SLP was designed, supplied, erected & commissioned by MECON Limited, a Government of Indian Enterprise, located at Ranchi during the period March 1999 to December 2003. It cost about 400 crore at that time. The second launch pad with associated facilities was built in 2005. However it became operational only on 5 May 2005 with the launching of PSLV-C6. MECON's sub-contractors for this project including Inox India, HEC, Tata Growth, Goderej Boyce, Simplex, Nagarjuna Construction, Steelage, etc. The other Launch Pad being the First Launch Pad. It is used by Polar Satellite Launch Vehicles and Geosynchronous Satellite Launch Vehicles, and is intended for use with future Indian rockets including the Geosynchronous Satellite Launch Vehicle Mk.III

Geosynchronous Satellite Launch Vehicle Mark III Indian medium-lift launch vehicle

The Geosynchronous Satellite Launch Vehicle Mark III, also referred to as the Launch Vehicle Mark 3 (LVM3) is a three-stage medium-lift launch vehicle developed by the Indian Space Research Organisation (ISRO). Primarily designed to launch communication satellites into geostationary orbit, it is also identified as launch vehicle for crewed missions under the Indian Human Spaceflight Programme and dedicated science missions like Chandrayaan-2. The GSLV-III has a higher payload capacity than the similarly named GSLV Mk 2.

However, the lander deviated from its intended trajectory starting at 2.1 kilometres (1.3 mi) altitude, [27] and had lost communication when touchdown confirmation was expected. [28] [29] Initial reports suggesting a crash [30] [31] have been confirmed by ISRO chairman K. Sivan, stating that the lander location had been found, and "it must have been a hard landing". [32]

Kailasavadivoo Sivan Chairman, Indian Space Research Organisation

Kailasavadivoo Sivan is an Indian space scientist and the chairperson of the Indian Space Research Organization. He has previously served as the Director of the Vikram Sarabhai Space Center and the Liquid Propulsion Systems Centre.

As of 8 September 2019, on-going efforts are being made by ISRO in hopes of restoring communications with Vikram. Both ISRO and NASA are in the process of trying to restore communications through their respective Deep Space Networks. Communication attempts will likely cease on 21 September 2019, fourteen days after Vikram's landing attempt. The orbiter, part of the mission with eight scientific instruments, remains operational and is expected to continue its seven-year mission to study the Moon.

History

On 12 November 2007, representatives of the Russian Federal Space Agency (Roscosmos) and ISRO signed an agreement for the two agencies to work together on the Chandrayaan-2 project. [33] ISRO would have the prime responsibility for the orbiter and rover, while Roscosmos was to provide the lander. The Indian government approved the mission in a meeting of the Union Cabinet, held on 18 September 2008 and chaired by Prime Minister Manmohan Singh. [34] The design of the spacecraft was completed in August 2009, with scientists of both countries conducting a joint review. [35] [36]

Government of India Legislative, executive and judiciary powers of India

The Government of India, often abbreviated as GoI, is the union government created by the constitution of India as the legislative, executive and judicial authority of the union of 29 states and seven union territories of a constitutionally democratic republic. It is located in New Delhi, the capital of India.

The Union Council of Ministers exercises executive authority in the Republic of India. It consists of senior ministers, called 'cabinet ministers', junior ministers, called 'ministers of state' and, rarely, deputy ministers.

Prime Minister of India Leader of the executive of the Government of India

The prime minister of India is the leader of the executive of the government of India. The prime minister is also the chief adviser to the president of India and head of the Council of Ministers. They can be a member of any of the two houses of the Parliament of India—the Lok Sabha and the Rajya Sabha —but has to be a member of the political party or coalition, having a majority in the Lok Sabha.

Although ISRO finalised the payload for Chandrayaan-2 per schedule, [37] the mission was postponed in January 2013 [38] and rescheduled to 2016 because Russia was unable to develop the lander on time. [39] [40] Roscosmos later withdrew in wake of the failure of the Fobos-Grunt mission to Mars, since the technical aspects connected with the Fobos-Grunt mission were also used in the lunar projects, which needed to be reviewed. [39] When Russia cited its inability to provide the lander even by 2015, India decided to develop the lunar mission independently. [38] [41]

Fobos-Grunt Russian spacecraft

Fobos-Grunt or Phobos-Grunt was an attempted Russian sample return mission to Phobos, one of the moons of Mars. Fobos-Grunt also carried the Chinese Mars orbiter Yinghuo-1 and the tiny Living Interplanetary Flight Experiment funded by the Planetary Society.

The spacecraft's launch had been scheduled for March 2018, but was first delayed to April and then to October to conduct further tests on the vehicle. [42] [43] On 19 June 2018, after the program's fourth Comprehensive Technical Review meeting, a number of changes in configuration and landing sequence were planned for implementation, pushing the launch to the first half of 2019. [44] Two of the lander's legs got minor damage during one of the tests in February 2019. [45]

Chandrayaan-2 launch was initially scheduled for 14 July 2019, 21:21 UTC (15 July 2019 at 02:51 IST local time), with the landing expected on 6 September 2019. [20] However, the launch was aborted due to a technical glitch and was rescheduled. [46] [8] [47] The launch occurred on 22 July 2019 at 09:13 UTC (14:43 IST) on the first operational flight of a GSLV MK III M1. [48]

Objectives

The primary objectives of the Chandrayaan-2 lander were to demonstrate the ability to soft-land on the lunar surface and operate a robotic rover on the surface. Scientific goals include orbital studies of lunar topography, mineralogy, elemental abundance, the lunar exosphere, and signatures of hydroxyl and water ice. [49] The orbiter will map the lunar surface and help to prepare 3D maps of it. The onboard radar will also map the surface while studying the water ice in the south polar region and thickness of the lunar regolith on the surface. [50]

Design

The mission was launched on a Geosynchronous Satellite Launch Vehicle Mark III (GSLV Mk III) with an approximate lift-off mass of 3,850 kg (8,490 lb) from Satish Dhawan Space Centre on Sriharikota Island. [3] [13] [10] [51] As of June 2019, the mission has an allocated cost of 978 crore (approximately US$141 million) which includes 603 crore for space segment and 375 crore as launch costs on GSLV Mk III. [52] [53] Chandrayaan-2 stack was initially put in an Earth parking orbit of 170 km perigee and 40,400 km apogee by the launch vehicle. [54]

Orbiter

Chandrayaan-2 orbiter at integration facility GSLV Mk III M1, Chandrayaan-2 - Orbiter at SDSC SHAR 01.jpg
Chandrayaan-2 orbiter at integration facility

As of September 2019, the Chandrayaan-2 orbiter was orbiting the Moon on a polar orbit at an altitude of 100 km (62 mi). [55] It carries eight scientific instruments; two of which are improved versions of those flown on Chandrayaan-1. The approximate launch mass was 2,379 kg (5,245 lb). [4] [5] [37] [56] The Orbiter High Resolution Camera (OHRC) will conduct high-resolution observations of the landing site prior to separation of the lander from the orbiter. [55] [2] The orbiter's structure was manufactured by Hindustan Aeronautics Limited and delivered to ISRO Satellite Centre on 22 June 2015. [57] [58]

Vikram lander

Rover Pragyan mounted on the ramp of Vikram lander GSLV Mk III M1, Chandrayaan-2 - Pragyan rover mounted on the ramp of Vikram lander.jpg
Rover Pragyan mounted on the ramp of Vikram lander
Images of the Earth captured by Chandrayaan-2 Vikram lander camera LI4 [60]

The mission's lander is called Vikram (Sanskrit : विक्रम, lit.  'Valour [61] ') Loudspeaker.svg Pronunciation   named after Vikram Sarabhai (1919–1971), who is widely regarded as the founder of the Indian space programme. [62]

The Vikram lander detached from the orbiter and descended to a low lunar orbit of 30 km × 100 km (19 mi × 62 mi) using its 800 N (180 lbf) liquid main engines. It then performed a comprehensive check of all its on-board systems before attempting a soft landing that would have deployed the rover, and perform scientific activities for approximately 14 Earth days. Vikram spacecraft apparently crash-landed. [30] [1] The lander's location has been spotted on the surface via thermal imaging, but its condition is unknown. [32] The approximate combined mass of the lander and rover is 1,471 kg (3,243 lb). [4] [5]

The preliminary configuration study of the lander was completed in 2013 by the Space Applications Centre (SAC) in Ahmedabad. [38] The lander's propulsion system consists of eight 50 N (11 lbf) thrusters for attitude control and five 800 N (180 lbf) liquid main engines derived from ISRO's 440 N (99 lbf) Liquid Apogee Motor. [63] [64] Initially, the lander design employed four main liquid engines, but a centrally mounted engine was added to handle new requirements of having to orbit the Moon before landing. The additional engine was expected to mitigate upward draft of lunar dust during the soft landing. [51] Vikram was designed to safely land on slopes up to 12°. [65] [66]

Some associated technologies include a high resolution camera, Laser Altimeter (LASA), [67] Lander Hazard Detection Avoidance Camera (LHDAC), Lander Position Detection Camera (LPDC), [68] Lander Horizontal Velocity Camera (LHVC), an 800 N throttleable liquid main engine, [57] attitude thrusters, Ka band radio altimeters (KaRA), [69] [70] Laser Inertial Reference & Accelerometer Package (LIRAP), [71] and the software needed to run these components. [2] [55] Engineering models of the lander began undergoing ground and aerial tests in late October 2016, in Challakere in the Chitradurga district of Karnataka. ISRO created roughly 10 craters on the surface to help assess the ability of the lander's sensors to select a landing site. [72]

Pragyan rover

Pragyan rover of the Chandrayaan-2 mission Pragyaan Lunar Rover for Chandrayaan-2.png
Pragyan rover of the Chandrayaan-2 mission

The mission's rover is called Pragyan (Sanskrit : प्रज्ञान, lit.  'Wisdom [73] [74] ') Loudspeaker.svg Pronunciation  ) [75] [73] with a mass of 27 kg (60 lb), would have operated on solar power. [4] [5] The rover was to move on 6 wheels traversing 500 meters on the lunar surface at the rate of 1 cm per second, perform on-site analyses and send the data to the lander, which would have relayed it to the Mission Control on the Earth. [76] [77] [37] [56] [52] For navigation, the rover uses:

The expected operating time of Pragyan rover was one lunar day, or around 14 Earth days, as its electronics were not designed to endure the frigid lunar night. However, its power system has a solar-powered sleep/wake-up cycle implemented, which could have resulted in longer service time than planned. [81] [82] Two aft wheels of the rover have the ISRO logo and the State Emblem of India embossed on them to leave behind patterned tracks on the lunar surface, [83] [84] which is used to measure the exact distance travelled, also called visual odometry.[ citation needed ]

Payload

Mission overview Chandrayaan-2 Mission Overview.jpg
Mission overview

ISRO selected eight scientific instruments for the orbiter, four for the lander, [85] [3] [86] and two for the rover. [37] While it was initially reported that NASA and ESA would participate in the mission by providing some scientific instruments for the orbiter, [87] ISRO in 2010 had clarified that due to weight restrictions it will not be carrying foreign payloads on this mission. [88] However, in an update just a month before launch, [89] an agreement between NASA and ISRO was signed to include a small laser retroreflector from NASA to the lander's payload to measure the distance between the satellites above and the microreflector on the lunar surface. [90] [91]

Orbiter

Payloads on the orbiter are: [3] [86] [1]

Vikram lander

The payloads on the Vikram lander are: [3] [86]

Pragyan rover

Pragyan rover carries two instruments to determine the abundance of elements near the landing site: [3] [86]

Chandrayaan-2 payloads CHACE2.png
CHACE2
Chandrayaan-2 payloads XSM.png
XSM
Chandrayaan-2 payloads CLASS.png
CLASS
Chandrayaan-2 payloads ILSA 6.png
ILSA MEMS sensor package
Laser Retroreflector for InSight Image-33-full.jpg
Laser retroreflector array (LRA)
Chandrayaan-2 payloads LIBS.png
LIBS
Chandrayaan-2 payloads APXS.png
APXS
Chandrayaan-2 payloads ChaSTE.png
ChaSTE

Mission profile

Animation of Chandrayaan-2
Animation of Chandrayaan-2 around Earth - Geocentric phase.gif
Geocentric phase
Animation of Chandrayaan-2 (LANDER) around Moon.gif
Lunar landing phase
Animation of Chandrayaan-2 around Earth.gif
Overall motion of Chandrayaan-2
   Earth ·   Moon ·   Chandrayaan-2
Timeline of operations [94] [95]
PhaseDateEventDetailResultReferences
Apogee /
Aposelene
Perigee /
Periselene
Geocentric phase22 July 2019 09:13:12 UTCLaunchBurn time: 16 min 14 sec45,475 km (28,257 mi)169.7 km (105.4 mi) [48]
24 July 2019 09:22 UTC1st orbit-raising maneuverBurn time: 48 sec45,163 km (28,063 mi)230 km (140 mi) [96]
25 July 2019 19:38 UTC2nd orbit-raising maneuverBurn time: 883 sec54,829 km (34,069 mi)251 km (156 mi) [97]
29 July 2019 09:42 UTC3rd orbit-raising maneuverBurn time: 989 sec71,792 km (44,609 mi)276 km (171.5 mi) [98]
2 August 2019 09:57 UTC4th orbit-raising maneuverBurn time: 646 sec89,472 km (55,595 mi)277 km (172 mi) [99]
6 August 2019 09:34 UTC5th orbit-raising maneuverBurn time: 1041 sec142,975 km (88,841 mi)276 km (171 mi) [100]
13 August 2019 20:51 UTC Trans-lunar injection Burn time: 1203 sec
[101]
Selenocentric phase20 August 2019 03:32 UTCLunar orbit insertion
1st lunar bound maneuver
Burn time: 1738 sec18,072 km (11,229 mi)114 km (71 mi) [102]
21 August 2019 07:20 UTC2nd lunar bound maneuverBurn time: 1228 sec4,412 km (2,741 mi)118 km (73 mi) [103]
28 August 2019 03:34 UTC3rd lunar bound maneuverBurn time: 1190 sec1,412 km (877 mi)179 km (111 mi) [104]
30 August 2019 12:48 UTC4th lunar bound maneuverBurn time: 1155 sec164 km (102 mi)124 km (77 mi) [105]
1 September 2019 12:51 UTC5th lunar bound maneuverBurn time: 52 sec127 km (79 mi)119 km (74 mi) [106]
Vikram lunar landing2 September 2019 7:45 UTCVikram separation
127 km (79 mi)119 km (74 mi) [107]
3 September 2019 3:20 UTC1st deorbit burnBurn time: 4 sec128 km (80 mi)104 km (65 mi) [108]
3 September 2019 22:12 UTC2nd deorbit burnBurn time: 9 sec101 km (63 mi)35 km (22 mi) [109]
6 September 2019 20:08 UTCPowered descentBurn time: 15 minLanding (planned)Landing (planned)
6 September 2019 20:23 UTCVikram landingTrajectory deviation started at 2.1 km altitude, telemetry was lost seconds before touchdown. [28]
7 September 2019 00:00 UTC-01:00 UTC (planned) Pragyan rover deployment
[110] [111]
Chandrayaan-2 lifting off on 22 July 2019 GSLV Mk III M1, Chandrayaan-2 Lifting off 01.jpg
Chandrayaan-2 lifting off on 22 July 2019

Launch

Chandrayaan-2 launch was initially scheduled for 14 July 2019, 21:21 UTC (15 July 2019 at 02:51 IST local time). [20] However, the launch was aborted 56 minutes and 24 seconds before launch due to a technical glitch, so it was rescheduled to 22 July 2019. [46] [8] Unconfirmed reports later cited a leak in the nipple joint of a helium gas bottle as the cause of cancellation. [47] [112] [113]

Finally Chandrayaan-2 was launched on-board the GSLV MK III M1 launch vehicle on 22 July 2019 at 09:13 UTC (14:43 IST) with better-than-expected apogee as a result of the cryogenic upper stage being burned to depletion, which later eliminated the need for one of the apogee-raising burns during the geocentric phase of mission. [48] [114] [115] This also resulted in the saving of around 40 kg fuel onboard the spacecraft. [116]

Immediately after launch, multiple observations of a slow-moving bright object over Australia were made, which could be related to upper stage venting of residual LOX/LH2 propellant after the main burn. [117] [118]

Geocentric phase

Chandrayaan-2 trajectory Chandrayaan2 trajectory.png
Chandrayaan-2 trajectory

After being placed into a 45,475 × 169 km parking orbit by the launch vehicle, [48] the Chandrayaan-2 spacecraft stack gradually raised its orbit using on-board propulsion over 22 days. In this phase, one perigee-raising and five apogee-raising burns were performed to reach a highly eccentric orbit of 142,975 × 276 km [100] followed by trans-lunar injection on 13 August 2019. [101] Such long Earth-bound phase with multiple orbit-raising manoeuvres exploiting the Oberth effect was required because of the limited lifting capacity of the launch vehicle and thrust of the spacecraft's on-board propulsion system. A similar strategy was used for Chandrayaan-1 and the Mars Orbiter Mission during their Earth-bound phase trajectory. [119] On 3 August 2019, the first set of Earth images were captured by the LI4 camera on the Vikram lander, showing North American landmass. [60]

Selenocentric phase

After 29 days from its launch, the Chandrayaan-2 spacecraft stack entered lunar orbit on 20 August 2019 after performing a lunar orbit insertion burn for 28 minutes 57 seconds. The three-spacecraft stack was placed into an elliptical orbit that passes over the polar regions of the Moon, with 18,072 km (11,229 mi) aposelene and 114 km (71 mi) periselene. [102] By 1 September 2019 this elliptical orbit was made nearly circular with 127 km (79 mi) aposelene and 119 km (74 mi) periselene after four orbit-lowering maneuvers [103] [104] [105] [106] followed by separation of Vikram lander from the orbiter on 7:45 UTC, 2 September 2019. [107]

Planned landing site

Landing site [120] Coordinates
Prime landing site 70°54′10″S22°46′52″E / 70.90267°S 22.78110°E / -70.90267; 22.78110
Alternate landing site 67°52′27″S18°28′10″W / 67.87406°S 18.46947°W / -67.87406; -18.46947

Two landing sites were selected, each with a landing ellipse of 32 × 11 km. [120] The prime landing site (PLS54) is at 70.90267 S 22.78110 E (~350 km north of the South Pole-Aitken Basin rim [26] [120] ), and the alternate landing site (ALS01) is at 67.874064 S 18.46947 W. The prime site is on a high plain between the craters Manzinus C and Simpelius N, [121] [26] on the near side of the Moon.

Hard landing

Vikram began its descent at 20:08:03 UTC, 6 September 2019 and was scheduled to land on the Moon at around 20:23 UTC. The descent and soft-landing were to be done by the on-board computers on Vikram, with mission control unable to make corrections. [122]

The initial descent was considered within mission parameters, passing critical braking procedures as expected, but the lander's trajectory began to deviate at about 2.1 kilometres (1.3 mi; 6,900 ft) above the surface. [123] [124] The final telemetry readings during ISRO's live-stream show that Vikram's final vertical velocity was 58 m/s (210 km/h) at 330 meters above the surface which, according to the MIT Technology Review, is "quite fast for a lunar landing." [28] Initial reports suggesting a crash [30] [31] were confirmed by ISRO chairman K. Sivan, stating that the lander location was found and that "it must have been a hard landing". [32] [125] [126]

Radio transmissions from the lander were tracked during descent by analysts using a 25-meter radio telescope owned by the Netherlands Institute for Radio Astronomy. Analysis of the doppler data suggests that the loss of signal coincided with the lander impacting the lunar surface at a velocity of nearly 50 metres (160 ft) per second (as opposed to an ideal 2 metres (6.6 ft) per second touchdown velocity). [3] [127]

The powered descent was also observed by the Lunar Reconnaissance Orbiter using its Lyman-Alpha Mapping Project (LAMP) instrument to study changes in the lunar exosphere due to exhaust gases from the lander's engines. [128]

Status

The mission's orbiter used thermal imaging to locate the lander. [129] Unconfirmed reports, citing an ISRO official, stated that the lander was intact, [130] but there has been no official announcement by ISRO on the lander's physical condition. [32] [131] ISRO's Chairman, K. Sivan, tasked senior scientist P. S. Goel to head the Failure Analysis Committee to look into the causes of the failure. [132] As of 8 September 2019, ongoing efforts are being made by ISRO in hopes to restore communications with Vikram, [133] while NASA's Lunar Reconnaissance Orbiter (LRO) is scheduled to fly over and acquire optical images for ISRO on 17 September 2019. [134] [135]

The orbiter part of the mission, with eight scientific instruments, remains operational, and will continue its seven-year mission to study the Moon. [124]

Team

A view of Mission Operations Complex (MOX-1), ISTRAC prior to the fourth Earth-bound burn. A view of Mission Operations Complex 1 (MOX-1) at ISTRAC, Peenya before commencement of fourth orbit raising burn for Chandrayaan-2.jpg
A view of Mission Operations Complex (MOX-1), ISTRAC prior to the fourth Earth-bound burn.

Key scientists and engineers involved in the development of Chandrayaan-2 include: [137] [138] [139]

See also

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The lunar south pole is of special interest to scientists because of the occurrence of water ice in permanently shadowed areas around it. The lunar south pole region features craters that are unique in that the near-constant sunlight does not reach their interior. Such craters are cold traps that contain a fossil record of hydrogen, water ice, and other volatiles dating from the early Solar System. In contrast, the lunar north pole region exhibits a much lower quantity of similarly sheltered craters.

<i>Gaganyaan</i> Indian crewed orbital spacecraft

Gaganyaan is an Indian crewed orbital spacecraft intended to be the basis of the Indian Human Spaceflight Programme. The spacecraft is being designed to carry three people, and a planned upgraded version will be equipped with rendezvous and docking capability. In its maiden crewed mission, Indian Space Research Organisation's largely autonomous 3.7-tonne (8,200 lb) capsule will orbit the Earth at 400 km (250 mi) altitude for up to seven days with a two or three-person crew on board. The crewed vehicle is planned to be launched on ISRO's GSLV Mk III in December 2021. This HAL-manufactured crew module had its first un-crewed experimental flight on 18 December 2014. As of May 2019, design of the crew module has been completed.

Lunar rover space exploration vehicle (rover) designed to move across the surface of the Moon

A lunar rover or Moon rover is a space exploration vehicle designed to move across the surface of the Moon. The Apollo Program's Lunar Roving Vehicle was driven on the Moon by members of three American crews, Apollo 15, 16, and 17. Other rovers have been partially or fully autonomous robots, such as the Soviet Union's Lunokhods and the Chinese Yutus. Four countries have had operating rovers on the Moon: the Soviet Union, the United States and China. Indian mission is en-route while Japan and Greece currently have planned missions.

The Chandrayaan programme, also known as the Indian Lunar Exploration Programme is an ongoing series of outer space missions by the Indian Space Research Organisation (ISRO). The programme incorporates a lunar orbiter, impactor, and future lunar lander and rover spacecraft. The name of the programme is from Sanskrit candrayāna.

<i>Pragyan</i> (rover) lunar rover in Chandrayaan-2 mission

Pragyan was the rover of Chandrayaan-2, a lunar mission developed by the Indian Space Research Organisation (ISRO).

Human Space Flight Centre

The Human Space Flight Centre (HSFC) is a centre of ISRO responsible for implementation of the Gaganyaan project.. The first crewed flight is planned for December 2021 on a home-grown GSLV-III rocket.

Chandrayaan-3 is a robotic sample-return lunar mission concept by the Indian Space Research Organisation (ISRO) and Japan's space agency JAXA that would send a lunar rover and lander to explore the south pole region of the Moon in 2024. JAXA is likely to provide the under-development H3 launch vehicle and the rover, while ISRO would be responsible for the lander.

References

  1. 1 2 3 4 Chandrayaan-2 Latest Update. ISRO Press Release on 7 September 2019.
  2. 1 2 3 4 5 Nair, Avinash (31 May 2015). "ISRO to deliver "eyes and ears" of Chandrayaan-2 by 2015-end". The Indian Express. Retrieved 7 August 2016.
  3. 1 2 3 4 5 6 7 8 9 "Launch Kit of GSLV Mk III M1 Chandrayaan-2" (PDF). ISRO. 19 July 2019. Archived (PDF) from the original on 19 July 2019. Retrieved 21 July 2019.
  4. 1 2 3 4 5 6 7 "Chandrayaan-2 to Be Launched in January 2019, Says ISRO Chief". Gadgets360. NDTV. Press Trust of India. 29 August 2018. Retrieved 29 August 2018.
  5. 1 2 3 4 5 6 7 "ISRO to send first Indian into Space by 2022 as announced by PM, says Dr Jitendra Singh" (Press release). Department of Space. 28 August 2018. Retrieved 29 August 2018.
  6. 1 2 3 4 5 6 7 "Chandrayaan-2: All you need to know about India's 2nd Moon mission". 22 July 2019. Archived from the original on 14 July 2019. Retrieved 22 July 2019.
  7. "Chandrayaan-2 – Home". Indian Space Research Organisation . Retrieved 20 June 2019.
  8. 1 2 3 "Chandrayan-2 Launch Rescheduled on 22nd July, 2019, AT 14:43 HRS". Indian Space Research Organisation. 18 July 2019. Retrieved 18 July 2019.
  9. 1 2 Singh, Surendra (5 August 2018). "Chandrayaan-2 launch put off: India, Israel in lunar race for 4th position". The Times of India. Times News Network. Retrieved 15 August 2018.
  10. 1 2 3 Shenoy, Jaideep (28 February 2016). "ISRO chief signals India's readiness for Chandrayaan II mission". The Times of India. Times News Network. Retrieved 7 August 2016.
  11. Ratcliffe, Rebecca (22 July 2019). "India's Chandrayaan-2 moon mission lifts off a week after aborted launch" . Retrieved 23 July 2019.
  12. 1 2 "GSLV-Mk III – M1 / Chandrayaan-2 Mission". ISRO.gov.in. Retrieved 21 July 2019.
  13. 1 2 3 4 5 6 Kiran Kumar, Aluru Seelin (August 2015). Chandrayaan-2 – India's Second Moon Mission. YouTube.com. Inter-University Centre for Astronomy and Astrophysics. Retrieved 7 August 2016.
  14. "ISRO aims for Chandrayaan-2 landing at 1.55 AM on September 07, says Dr K. Sivan" . Retrieved 24 August 2019.
  15. Monier Monier-Williams, A Sanskrit-English Dictionary (1899): candra : "[...] m. the moon (also personified as a deity Mn. &c)" yāna: "[...] n. a vehicle of any kind , carriage , waggon , vessel , ship , [...]"
  16. "Chandrayaan-2 FAQ" . Retrieved 24 August 2019. The name Chandrayaan means “Chandra- Moon, Yaan-vehicle”, –in Indian languages (Sanskrit and Hindi), – the lunar spacecraft.
  17. Kumar, Chethan (10 June 2019). "Chandrayaan-2 nearly ready for July launch". The Times of India. Retrieved 14 July 2019.
  18. d. s, Madhumathi (9 June 2019). "ISRO gears up for Chandrayaan-2 mission". The Hindu.
  19. "ISRO begins flight integration activity for Chandrayaan-2, as scientists tests lander and rover". The Indian Express. Press Trust of India. 25 October 2017. Retrieved 21 December 2017.
  20. 1 2 3 "Press release on Chandrayaan-2, ISRO". www.isro.gov.in. Retrieved 1 May 2019.
  21. Bagla, Pallava (4 August 2018). "India Slips in Lunar Race with Israel As Ambitious Mission Hits Delays". NDTV. Retrieved 15 August 2018.
  22. Rathinavel, T.; Singh, Jitendra (24 November 2016). "Question No. 1084: Deployment of Rover on Lunar Surface" (PDF). Rajya Sabha.
  23. 1 2 3 4 5 6 7 "Launch kit at a glance".
  24. "Chandrayaan-2 Launch Mission: Bahubali rocket set to take-off at 2:43 pm today".
  25. Kottasová, Ivana; Gupta, Swati (20 August 2019). "India's Chandrayaan-2 moon mission enters lunar orbit". CNN . Retrieved 6 September 2019.
  26. 1 2 3 Geological Insights into Chandrayaan-2 Landing Site in the Southern High Latitudes of the Moon. Rishiosh K. Sinha, Vijayan Sivaprahasam, Megha Bhatt, Harish Nandal, Nandita Kumari, Neeraj Srivastava, Indhu Varatharajan, Dwijesh Ray, Christian Wöhler, and Anil Bhardwaj. 50th Lunar and Planetary Science Conference 2019 (LPI Contrib. No. 2132).
  27. "Extra brake thrust may have sent Vikram out of control in home stretch".
  28. 1 2 3 Neel V. Patel (6 September 2019). "India's Chandrayaan-2 lander likely crashed into the moon's surface". MIT Technology Review. Retrieved 7 September 2019.
  29. "Did India's Chandrayaan-2 Moon Lander Survive? The Chances Are Slim".
  30. 1 2 3 India's Moon Mission Continues Despite Apparent Lander Crash. Mike Wall, Space. 7 September 2019. Quote: "India's Moon Mission Continues Despite Apparent Lander Crash."
  31. 1 2 "India's Vikram Spacecraft Apparently Crash-Lands on Moon". www.planetary.org. Retrieved 7 September 2019.
  32. 1 2 3 4 Vikram lander located on lunar surface, wasn't a soft landing: Isro. Times of India. 8 September 2019.
  33. Chand, Manish (12 November 2007). "India, Russia to expand n-cooperation, defer Kudankulam deal". Nerve. Archived from the original on 13 January 2014. Retrieved 12 January 2015.
  34. Sunderarajan, P. (19 September 2008). "Cabinet clears Chandrayaan-2". The Hindu. Retrieved 23 October 2008.
  35. "ISRO completes Chandrayaan-2 design". Domain-b.com. 17 August 2009. Retrieved 20 August 2009.
  36. "India and Russia complete design of new lunar probe". Sputnik News. RIA Novosti. 17 August 2009. Retrieved 20 August 2009.
  37. 1 2 3 4 5 6 7 8 9 10 "Payloads for Chandrayaan-2 Mission Finalised" (Press release). Indian Space Research Organisation. 30 August 2010. Retrieved 4 January 2010.
  38. 1 2 3 Ramachandran, R. (22 January 2013). "Chandrayaan-2: India to go it alone". The Hindu.
  39. 1 2 Laxman, Srinivas (6 February 2012). "India's Chandrayaan-2 Moon Mission Likely Delayed After Russian Probe Failure". Asian Scientist. Retrieved 5 April 2012.
  40. "India's next moon mission depends on Russia: ISRO chief". NDTV . Indo-Asian News Service. 9 September 2012.
  41. "Chandrayaan-2" (Press release). Department of Space. 14 August 2013. Chandrayaan-2 would be a lone mission by India without Russian tie-up.
  42. Clark, Stephen (15 August 2018). "Launch Schedule". Spaceflight Now. Archived from the original on 16 August 2018.
  43. "Chandrayaan-2 launch postponed to October: ISRO chief". The Economic Times. Press Trust of India. 23 March 2018. Retrieved 16 August 2018.
  44. "ISRO to launch PSLVC-46 followed by PSLVC-47, Chandrayaan-2 in May: K. Sivan". Asian News International . 1 April 2019. Retrieved 1 April 2019.
  45. "India's Moon Lander Damaged During Test, Chandrayaan 2 Launch Put on Hold". The Wire. Retrieved 7 April 2019.
  46. 1 2 "Chandrayaan 2 Moon Mission Launch Aborted After Technical Snag: 10 Points". NDTV.com. Retrieved 15 July 2019.
  47. 1 2 "Isro pinpoints GSLV-MkIII leak to 'nipple joint' of cryo engine". The Times of India. 17 July 2019. Retrieved 23 July 2019.
  48. 1 2 3 4 "GSLV MkIII-M1 Successfully Launches Chandrayaan-2 spacecraft". www.isro.gov.in. ISRO. Retrieved 23 July 2019.
  49. "Chandrayaan 2". NSSDCA Master Catalog . NASA . Retrieved 3 July 2019.
  50. Banerji, Abigail (13 July 2019). "Chandrayaan 2: Everything you need to know about the orbiter's mission and design". Tech2 . Retrieved 14 July 2019.
  51. 1 2 Kumar, Chethan (12 August 2018). "Isro wants Chandrayaan-2 lander to orbit moon first". The Times of India. Times News Network. Retrieved 15 August 2018.
  52. 1 2 Ramesh, Sandhya (12 June 2019). "Why Chandrayaan-2 is ISRO's 'most complex mission' so far". ThePrint. Retrieved 12 June 2019.
  53. Singh, Surendra (20 February 2018). "Chandrayaan-2 mission cheaper than Hollywood film Interstellar". The Times of India. Times News Network. Retrieved 3 March 2018.
  54. "Department of Space presentation on 18 Jan 2019" (PDF). 18 January 2019. Retrieved 30 January 2019.
  55. 1 2 3 "Annual Report 2014–2015" (PDF). Indian Space Research Organisation. December 2014. p. 82.
  56. 1 2 "Chandrayaan-2 to get closer to moon". The Economic Times. Times News Network. 2 September 2010. Archived from the original on 12 August 2011.
  57. 1 2 "Annual Report 2015-2016" (PDF). Indian Space Research Organisation. December 2015. p. 89. Archived from the original (PDF) on 5 July 2016.
  58. "HAL Delivers the Orbiter Craft Module Structure of Chandrayaan-2 to ISRO". Hindustan Aeronautics Limited. 22 June 2015. Archived from the original on 2 September 2018.
  59. 1 2 3 Singh, Surendra (7 September 2019). "Orbiter will have a lifespan of 7.5 years, it's possible to find Vikram Lander from orbiter: Isro chief | India News - Times of India". The Times of India. Retrieved 7 September 2019.
  60. 1 2 "First set of beautiful images of the Earth captured by Chandrayaan-2 Vikram Lander". Archived from the original on 6 August 2019. Retrieved 25 August 2019.
  61. Wilson, Horace Hayman (1832). A dictionary in Sanscrit and English. Calcutta: Education Press. p. 760.
  62. Kumar, Chethan (12 August 2018). "Chandrayaan-2 Lander to be named 'Vikram' after Sarabhai". The Times of India. Times News Network. Retrieved 15 August 2018.
  63. "ISRO developing vehicle to launch small satellites". Frontline. Retrieved 29 August 2018. Making a throttleable engine of 3 kilonewtons or 4 kilonewtons is a totally new development for us. But we wanted to make use of available technologies. We have a LAM [liquid apogee motor] with a 400 newton thruster, and we have been using it on our satellites. We enhanced it to 800 newtons. It was not a major, new design change.
  64. Mondal, Chinmoy; Chakrabarti, Subrata; Venkittaraman, D.; Manimaran, A. (2015). Development of a Proportional Flow Control Valve for the 800N Engine Test. 9th National Symposium and Exhibition on Aerospace and Related Mechanisms. January 2015. Bengaluru, India.
  65. "Chandrayaan-2: First step towards Indians setting foot on moon in near future". The New Indian Express. Retrieved 8 July 2019. As solar energy powers the system, a place with good visibility and area of communication was needed. Also, the place where the landing takes place should not have many boulders and craters. The slope for landing should be less than 12 degrees. The South pole has a near-flat surface, with good visibility and sunlight available from the convenience point of view,
  66. Subramanian, T. S. "Chandrayaan 2: Giant leap for ISRO". Frontline. Retrieved 9 July 2019.
  67. "How ISRO Plans To Pull Off An Unprecedented Landing On Moon's South Pole". NDTV.com. Retrieved 5 September 2019.
  68. "Space Applications Centre, Annual Report 2016–17" (PDF). SAC. p. 35. Archived (PDF) from the original on 2 January 2018. Retrieved 20 July 2019.
  69. "Key payload for Chandrayaan-2 leaves for Bengaluru". The Times of India. Retrieved 20 July 2019.
  70. "SAC Seminar 2016" (PDF). SAC.gov.in (in Hindi). 21 July 2017. p. 94. Archived (PDF) from the original on 5 September 2019. Retrieved 5 September 2019.
  71. "Department of Space Annual Report 2016–17" (PDF). ISRO.gov.in. Archived (PDF) from the original on 18 March 2017. Retrieved 20 July 2019.
  72. D. S., Madhumathi (25 October 2016). "ISRO starts landing tests for Chandrayaan-2 mission". The Hindu. Retrieved 28 October 2016.
  73. 1 2 "Chandrayaan-2 Spacecraft" . Retrieved 24 August 2019. Chandrayaan 2's Rover is a 6-wheeled robotic vehicle named Pragyan, which translates to 'wisdom' in Sanskrit.
  74. Wilson, Horace Hayman (1832). A dictionary in Sanscrit and English. Calcutta: Education Press. p. 561.
  75. Elumalai, V.; Kharge, Mallikarjun (7 February 2019). "Chandrayaan – II" (PDF). PIB.nic.in. Archived from the original (PDF) on 7 February 2019. Retrieved 7 February 2019. Lander (Vikram) is undergoing final integration tests. Rover (Pragyan) has completed all tests and waiting for the Vikram readiness to undergo further tests.
  76. "ISRO to Launch Chandrayaan 2 on July 15, Moon Landing by September 7". The Wire. Retrieved 12 June 2019.
  77. Singh, Surendra; 2019; Ist, 14:02. "Chandrayaan-2 will carry 14 payloads to moon, no foreign module this time". The Times of India. TNN. Retrieved 11 May 2019.
  78. Laha, Jayanta; Dinesh, B.; Selvaraj, P.; Krishnamoorthy, Subhalakshmi (2018). "Realization of Space Grade Miniature Digital Camera for Lunar Navigation" (PDF). International Journal of Pure and Applied Mathematics. 118 (16): 1105–1116. Archived (PDF) from the original on 26 September 2018.
  79. "With robot hands, IIT-K profs bring joy to paralytics". The Times of India. 2019. Retrieved 10 July 2019.
  80. Annadurai, Mylswami; Nagesh, G.; Vanitha, Muthayaa (28 June 2017). ""Chandrayaan-2: Lunar Orbiter & Lander Mission", 10th IAA Symposium on The Future of Space Exploration: Towards the Moon Village and Beyond, Torin, Italy". Archived from the original on 29 June 2017. Retrieved 14 June 2019. Mobility of the Rover in the unknown lunar terrain is accomplished by a Rocker bogie suspension system driven by six wheels. Brushless DC motors are used to drive the wheels to move along the desired path and steering is accomplished by differential speed of the wheels. The wheels are designed after extensive modelling of the wheel-soil interaction, considering the lunar soil properties, sinkage and slippage results from a single wheel test bed. The Rover mobility has been tested in the Lunar test facility wherein the soil simulant, terrain and the gravity of moon are simulated. The limitations w.r.t slope, obstacles, pits in view of slippage/sinkage have been experimentally verified with the analysis results.
  81. "Dr M Annadurai, Project director, Chandrayaan 1: 'Chandrayaan 2 logical extension of what we did in first mission'". The Indian Express. 29 June 2019. Retrieved 30 June 2019.
  82. Payyappilly, Baiju; Muthusamy, Sankaran (17 January 2018). "Design framework of a configurable electrical power system for lunar rover". ResearchGate: 1–6. doi:10.1109/ICPCES.2017.8117660. ISBN   978-1-5090-4426-9.
  83. "Ashoka Chakra, ISRO Logo, Flag: Chandrayaan 2 Set to Engrave India's Name on Moon for Centuries" . Retrieved 4 September 2019.
  84. Curtain Raiser video (Hindi) (in Hindi). Event occurs at 1 minute 55 seconds.
  85. 1 2 3 Bagla, Pallava (31 January 2018). "India plans tricky and unprecedented landing near moon's south pole". Science. Retrieved 8 March 2018.
  86. 1 2 3 4 5 6 "Chandrayaan-2 Payloads". 12 June 2019. Archived from the original on 13 July 2019. Retrieved 13 July 2019.
  87. Beary, Habib (4 February 2010). "NASA and ESA to partner for Chandrayaan-2". Sakal Times. Retrieved 22 February 2010.
  88. Laxman, Srinivas (5 September 2010). "'We're launching Chandrayaan-2 for a total coverage of the moon'". The Times of India .
  89. 1 2 Bartels, Meghan (24 March 2019). "How NASA Scrambled to Add Science Experiments to Israeli, Indian Moon Probes" . Retrieved 25 March 2019.
  90. 1 2 3 Science, Chelsea Gohd 2019-07-26T16:42:31Z; Astronomy. "50 Years After Apollo, India Is Carrying a NASA Laser Reflector to the Moon (And It's Only the Start)". Space.com. Retrieved 26 July 2019.
  91. "Implementing arrangement between India and United States of America for cooperation on the Chandrayaan mission-2" (PDF). Ministry of External Affairs. 11 February 2019. Archived (PDF) from the original on 30 July 2019. Retrieved 30 July 2019.
  92. Mallikarjun, Y. (29 May 2013). "India plans to send seismometer to study moonquakes". The Hindu . Retrieved 1 June 2013.
  93. India Heads to the Moon With Chandrayaan 2. David Dickinson, Sky & Telescope. 22 July 2019. Quote: "Vikram carries a seismometer, thermal probe, and an instrument to measure variation and density of lunar surface plasma, along with a laser retro-reflector supplied by NASA's Goddard Spaceflight Center."
  94. "Chandrayaan-2 update:Mission Plan of Chandrayaan-2 spacecraft - ISRO". www.isro.gov.in. Retrieved 24 July 2019.
  95. "Live media coverage of the landing of Chandrayaan-2 on lunar surface - ISRO". www.isro.gov.in. Retrieved 2 September 2019.
  96. "Chandrayaan2 update: First earth bound maneuver - ISRO". www.isro.gov.in. Retrieved 24 July 2019.
  97. "Chandrayaan2 update: Second earth bound maneuver". ISRO.gov.in. 26 July 2019. Archived from the original on 25 July 2019. Retrieved 26 July 2019.
  98. "Chandrayaan2 update: Third earth bound maneuver - ISRO". www.isro.gov.in. Retrieved 29 July 2019.
  99. 1 2 "Chandrayaan2 update: Fourth earth bound maneuver". www.isro.gov.in. Retrieved 2 August 2019.
  100. 1 2 "Chandrayaan2 update: Fifth earth bound maneuver". www.isro.gov.in. Retrieved 6 August 2019.
  101. 1 2 "Chandrayaan-2 Successfully enters Lunar Transfer Trajectory". www.isro.gov.in. Retrieved 14 August 2019.
  102. 1 2 "Chandrayaan-2 update: Lunar Orbit Insertion". www.isro.gov.in. Retrieved 20 August 2019.
  103. 1 2 "Chandrayaan-2 update: Second Lunar Orbit Maneuver". www.isro.gov.in. ISRO. Retrieved 21 August 2019.
  104. 1 2 "Chandrayaan-2 update: Third Lunar bound Orbit Maneuver". www.isro.gov.in. ISRO. Retrieved 28 August 2019.
  105. 1 2 "Chandrayaan-2 update: Fourth Lunar Orbit Maneuver". www.isro.gov.in. ISRO. Retrieved 30 August 2019.
  106. 1 2 "Chandrayaan-2 update: Fifth Lunar Orbit Maneuver". www.isro.gov.in. ISRO. Retrieved 1 September 2019.
  107. 1 2 "Chandrayaan-2 update: Vikram Lander successfully separates from Orbiter - ISRO". www.isro.gov.in. Retrieved 2 September 2019.
  108. "Chandrayaan-2 update: First de-orbiting maneuver - ISRO". www.isro.gov.in. Retrieved 3 September 2019.
  109. "Chandrayaan-2 update: Second de-orbiting maneuver - ISRO". www.isro.gov.in. Retrieved 3 September 2019.
  110. News, All India Radio (6 September 2019). "#Chandrayaan2 ; Vikram & Pragyan Timeline : #Chandrayaan2Live #Chandrayaan2Landingpic.twitter.com/nZ2u18OXjb". @airnewsalerts (in Hungarian). Archived from the original on 11 September 2019. Retrieved 11 September 2019.
  111. "Chandrayaan 2 Landing highlights: PM Narendra Modi says India stands in solidarity with ISRO scientists- Technology News, Firstpost". Tech2. 6 September 2019. Retrieved 11 September 2019.
  112. Subramanian, T. S. "What went wrong with the Chandrayaan-2 launch". Frontline. Retrieved 24 July 2019.
  113. Chandran, Cynthia (23 July 2019). "For VSSC chief, setbacks are part of victory cruise". Deccan Chronicle. Retrieved 24 July 2019.
  114. Kumar, Chethan (23 July 2019). "Chandrayaan-2 will only have 4 operations around Earth". The Times of India. Bennett, Coleman & Co. Retrieved 24 July 2019.
  115. "Live coverage: India's Chandrayaan 2 moon mission blasts off". SpaceFlight Now. Retrieved 24 July 2019.
  116. Kumar, Chethan (29 July 2019). "Chandrayaan-2 healthy after another manoeuvre | India News - Times of India". The Times of India. Retrieved 29 July 2019.
  117. Hartley, Anna (23 July 2019). "Strange object in the night sky was probably a rocket heading to the Moon: astronomer". ABC News. Retrieved 27 July 2019.
  118. Acharya, Mosiqi (24 July 2019). "Was the mysterious bright spot in Australian skies Chandrayaan-2, India's mission to Moon?". SBS Hindi. Retrieved 7 September 2019.
  119. "Here's Why Chandrayaan-2 Will Take 48 Days to Reach the Moon". 9 August 2019. Archived from the original on 25 August 2019. Retrieved 25 August 2019.
  120. 1 2 3 Amitabh, S.; Srinivasan, T. P.; Suresh, K. (2018). Potential Landing Sites for Chandrayaan-2 Lander in Southern Hemisphere of Moon (PDF). 49th Lunar and Planetary Science Conference. 19–23 March 2018. The Woodlands, Texas. Bibcode:2018LPI....49.1975A. Archived from the original (PDF) on 22 August 2018.
  121. Srishti Choudhary (14 July 2019). "Chandrayaan-2: How 'Lander Vikram' will touchdown on the moon?". Live Mint.
  122. Chandrayaan 2: Here's everything about ISRO Moon-landing its Vikram lander. Financial Express. Ribhu Mishra, 7 September 2019.
  123. India Just Found Its Lost Vikram Lander on the Moon, Still No Signal. Tariq Malik ,Space. 8 September 2019.
  124. 1 2 India has Located the Vikram Lander, But it's Still not Communicating With Home. Matt Williams, Universe Today. 11 September 2019.
  125. "Lander Vikram located: K Sivan". www.aninews.in. Retrieved 8 September 2019.
  126. Schultz, Kai (8 September 2019). "India Says It Has Located Chandrayaan-2 Lander on Moon's Surface". The New York Times . Retrieved 8 September 2019.
  127. Chang, Kenneth (10 September 2019). "Did India's Chandrayaan-2 Moon Lander Survive? The Chances Are Slim". The New York Times. ISSN   0362-4331 . Retrieved 11 September 2019.
  128. Spaceflight, Meghan Bartels 2019-09-13T21:53:57Z. "US Moon Landing Hopefuls Watch Silent India Lander — and Learn". Space.com. Retrieved 14 September 2019.
  129. India Spacecraft Located, Condition Unknown. Lauren Frayer, NPR. 8 September 2018.
  130. "Lander 'tilted' not broken, says ISRO". the Hindu. PTI. 9 September 2019.
  131. India Locates Its Lost Vikram Lander on the Moon. Tariq Malik, Scientific American. 9 September 2019.
  132. Hard landing derailed lunar mission, says K Sivan. Raghu Krishnan, The Economic Times, 9 September 2019.
  133. Chandrayaan-2 - Latest Updates. ISRO. Accessed on 10 September 2019.
  134. Chandrayaan-2: Nasa Moon orbiter to fly over Vikram landing site, take photos next week. India Today. 12 September 2019.
  135. NASA lunar orbiter to image Chandrayaan 2 landing site next week. Stephen Clark, Spaceflight Now. 12 September 2019.
  136. "At Bangalore mission control,all eyes on Mars". 16 December 2013. Retrieved 2 August 2019.
  137. The women, and men, behind Chandrayaan 2. Madhumathi D.S., The Hindu. 15 July 2019.
  138. Chandrayaan-2: India launches second Moon mission. BBC News. 22 July 2019.
  139. "Chandrayaan-2 deputy project director taught village students to fund his education". The Times of India. 30 July 2019. Retrieved 23 August 2019.
  140. "BENGALURU, KARNATAKA, INDIA. Ms K Kalpana, an electrical engineer at..." Getty Images. Retrieved 11 September 2019.
  141. Rajwi, Tiki (14 July 2019). "The Malayali hand in Chandrayaan-2". The Hindu. Special Correspondent. ISSN   0971-751X . Retrieved 11 September 2019.
  142. SUBRAMANIAN, T. S. "Cryogenic gains for GSLV". Frontline. Retrieved 11 September 2019.
  143. "Amitabh Singh | M Tech. | Indian Space Research Organization, Bengaluru | ISRO | signal & Image Processing | ResearchGate". ResearchGate. Retrieved 26 August 2019.