Johannes Kepler ATV

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Johannes Kepler ATV
View of ATV-2 - cropped and rotated.jpg
Johannes Kepler in orbit, prior to its rendezvous with the ISS
Mission type ISS resupply
Operator European Space Agency
COSPAR ID 2011-007A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 37368 OOjs UI icon edit-ltr-progressive.svg
Mission duration124 days, 22 hours, 53 minutes
Spacecraft properties
Spacecraft type Automated Transfer Vehicle
Manufacturer EADS Astrium
Thales Alenia Space
Launch mass20,050 kilograms (44,200 lb)
Start of mission
Launch date16 February 2011, 21:51 (2011-02-16UTC21:51Z)  UTC
Rocket Ariane 5ES
Launch site Guiana, ELA-3
Contractor Arianespace
End of mission
DisposalDeorbited
Decay date21 June 2011, 20:44 (2011-06-21UTC20:45Z) UTC
Orbital parameters
Reference system Geocentric
Regime Low Earth
Inclination 51.6°
Docking with ISS
Docking port Zvezda Aft
Docking date24 February 2011, 15:59:19 UTC [1]
Undocking date20 June 2011, 15:46 UTC [2]
Time docked115 days, 23 hours, 46 minutes
Cargo
Mass7,084 kg (15,618 lb)
Pressurised1,600 kg (3,500 lb)
Fuel5,384 kg (11,870 lb)
Gaseous100 kg (220 lb)
Johannes Kepler ATV.png
  ATV-1
ATV-3  

The Johannes Kepler ATV, or Automated Transfer Vehicle 2 (ATV-2), was an uncrewed cargo spacecraft built to resupply the International Space Station (ISS). It was launched on February 16, 2011 by the European Space Agency (ESA). [3] Johannes Kepler carried propellant, air and dry cargo weighing over 7,000 kilograms (15,000 lb), [4] and had a total mass of over 20,000 kilograms (44,000 lb), [5] making it, at the time, the heaviest payload launched by the ESA. [6] The second of five Automated Transfer Vehicle spacecraft, it was named after the 17th-century German astronomer Johannes Kepler. [7]

Contents

The ATV carried around five tons more cargo than Russia's Progress-M resupply spacecraft, and about 1.5 tons more than the Japanese HTV. [8] The ATV used 4,500 kilograms (9,900 lb) of fuel to boost the ISS's altitude from 350 to 400 km. [9]

Many of the supplies aboard the ATV were used for the Space Shuttle mission STS-133 and the ISS Expedition 26. [1] A Reentry Breakup Recorder was placed aboard the ATV before it undocked from the ISS on June 20,2011. [10] Johannes Kepler performed a destructive re-entry as intended on 21 June 2011, with its remains impacting the Pacific Ocean.

Spacecraft

Johannes Kepler consisted of two sections: the Propulsion Module, with four main engines and 28 smaller maneuvering thrusters, and the Integrated Cargo Carrier, which attached directly to the ISS and could hold up to eight standard payload racks. [8] The four solar wings of the spacecraft provided up to 4,800 watts of electrical power to its rechargeable batteries.

The ATV's rendezvous and docking system mounted a telegoniometer, which functioned as a radar system, and two videometers, which fired laser pulses at cube-shaped reflectors on the ISS' Zvezda service module for range detection. The nose of the spacecraft contained rendezvous sensors and Russian docking equipment.

Specifications

Diameter at widest point4.5 metres (15 ft)
Length (probe retracted)9.7 metres (32 ft)
Spacecraft mass (with fluids loaded)20,020 kilograms (44,140 lb)
Deployed solar array width22.3 metres (73 ft)

Mission payload

CargoMass
ISS reboost/attitude control propellants4,534 kilograms (9,996 lb)
ISS refuel propellant850 kilograms (1,870 lb)
Oxygen gas100 kilograms (220 lb)
Water0 kilograms (0 lb)
Dry cargo (food, clothes, equipment)1,600 kilograms (3,500 lb)
Total7,084 kilograms (15,618 lb)
Source: [11]

GeoFlow II

Johannes Kepler delivered the GeoFlow II hydrodynamics experiment container to the ISS. This experiment was designed to observe liquid movements in microgravity, and compare them with computer simulations, thus helping scientists to understand convection currents within the Earth's mantle. [12]

Mission summary

Launch

Johannes Kepler's launch as seen from the ISS. The ATV is the thin white plume rising from the Earth in the center of the image. ATV-2 launch from ISS.jpg
Johannes Kepler's launch as seen from the ISS. The ATV is the thin white plume rising from the Earth in the center of the image.

On 16 February 2011 UTC, Johannes Kepler was launched on an Ariane 5ES rocket from the Guiana Space Centre in Kourou, French Guiana. The launch was conducted by Arianespace on behalf of the ESA. [3]

The first launch attempt, on 15 February 2011, was halted four minutes before lift-off, due to an erroneous signal from one of the rocket's fuel tanks. [13]

Docking

Johannes Kepler approaches the ISS on 24 February 2011. ATV-2 approaching the ISS.jpg
Johannes Kepler approaches the ISS on 24 February 2011.
Johannes Kepler ATV prepares to dock with the Zvezda module of the ISS. ISS-26 ATV-2 Johannes Kepler docks to Zvezda.jpg
Johannes Kepler ATV prepares to dock with the Zvezda module of the ISS.

Docking with the ISS was completed on 24 February 2011 at 15:59 UTC, after a 15-minute delay. [14] The spacecraft traveled over eight days to catch up with the space station, and arrived at the aft port of the station's Zvezda service module. During the rendezvous operations, ATV-2 traveled a total of 2.5 million miles. The docking occurred as ATV-2 and the ISS flew over the coast of Liberia in western Africa. Hooks and latches engaged a few minutes later to firmly attach ATV-2 to the ISS.

The Johannes Kepler mission marked the first time European astronauts were on board the International Space Station during an ATV mission, with Italian astronaut Paolo Nespoli welcoming the ATV's arrival. ESA astronaut Roberto Vittori was also aboard the ISS at the same time as the ATV, having arrived on Space Shuttle Endeavour on the STS-134 mission in May 2011. [15]

ISS altitude Increase

Close-up view of Johannes Kepler ATV (top), photographed from the departing Space Shuttle Discovery on 7 March 2011. STS-133 International Space Station after undocking (close-up).jpg
Close-up view of Johannes Kepler ATV (top), photographed from the departing Space Shuttle Discovery on 7 March 2011.

Johannes Kepler was used to boost the ISS's standard altitude from about 350 kilometers (220 statute miles) to 400 km (248 miles). [9] The higher altitude has lower atmospheric drag, which reduces the propellant needed annually to maintain the station's altitude from 6,800 kg (15,000 lb) to roughly 3,630 kg (8,000 lb), depending on atmospheric conditions. [9] The ATV used about 4,500 kg (9,900 lb) of rocket fuel to accomplish this change, with the reboost occurring incrementally over several months. [9]

End of mission and deorbit

On 20 June 2011, Johannes Kepler undocked from the ISS. [16] At 18:30 UTC (20:30 CEST) that same day, while preparing to deorbit, the ATV was forced to conduct a debris-avoidance maneuver, using some of its remaining fuel to move into a safe orbit after NASA warned of a potential collision with orbital debris. [17] On 21 June 2011, the ATV deorbited, burning up in the atmosphere as planned over the South Pacific Ocean at around 22:44 CET. [18]

ATV missions

DesignationNameLaunch dateISS docking dateDeorbit dateSources
ATV-1 Jules Verne 9 March 20083 April 200829 September 2008

[19]

ATV-2 Johannes Kepler 16 February 201124 February 201121 July 2011

[20]

ATV-3 Edoardo Amaldi 23 March 201228 March 20123 October 2012 [21]

[22]

ATV-4 Albert Einstein 5 June 201315 June 20132 November 2013

[23] [24]

ATV-5 Georges Lemaître 29 July 2014 [25] [26] 12 August 2014 [25] 15 February 2015 [26]

[27] [28]

See also

Related Research Articles

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<span class="mw-page-title-main">Progress (spacecraft)</span> Russian expendable freighter spacecraft

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<span class="mw-page-title-main">Automated Transfer Vehicle</span> Uncrewed cargo spacecraft developed by the European Space Agency

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<span class="mw-page-title-main">Paolo Nespoli</span> Italian astronaut and engineer (born 1957)

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