MESSENGER

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  • MESSENGER trajectory.svg
    Interplanetary trajectory of the MESSENGER orbiter.

    • Earth flyby

    MESSENGER performed an Earth flyby one year after launch, on August 2, 2005, with the closest approach at 19:13 UTC at an altitude of 2,347 kilometers (1,458 statute miles) over central Mongolia. On December 12, 2005, a 524-second-long burn (Deep-Space Maneuver or DSM-1) of the large thruster adjusted the trajectory for the upcoming Venus flyby by 316 m/s. [61]

    During the Earth flyby, the MESSENGER team imaged the Earth and Moon using MDIS and checked the status of several other instruments observing the atmospheric and surface compositions and testing the magnetosphere and determining that all instruments tested were working as expected. This calibration period was intended to ensure accurate interpretation of data when the spacecraft entered orbit around Mercury. Ensuring that the instruments functioned correctly at such an early stage in the mission allowed opportunity for multiple minor errors to be dealt with. [62]

    The Earth flyby was used to investigate the flyby anomaly, where some spacecraft have been observed to have trajectories that differ slightly from those predicted. However no anomaly was observed in MESSENGER's flyby. [63]

    Two Venus flybys

    On October 24, 2006, at 08:34 UTC, MESSENGER encountered Venus at an altitude of 2,992 kilometers (1,859 mi). During the encounter, MESSENGER passed behind Venus and entered superior conjunction, a period when Earth was on the exact opposite side of the Solar System, with the Sun inhibiting radio contact. For this reason, no scientific observations were conducted during the flyby. Communication with the spacecraft was reestablished in late November and performed a deep space maneuver on December 12, to correct the trajectory to encounter Venus in a second flyby. [64]

    On June 5, 2007, at 23:08 UTC, MESSENGER performed a second flyby of Venus at an altitude of 338 km (210 mi), for the greatest velocity reduction of the mission. During the encounter, all instruments were used to observe Venus and prepare for the following Mercury encounters. The encounter provided visible and near-infrared imaging data of the upper atmosphere of Venus. Ultraviolet and X-ray spectrometry of the upper atmosphere were also recorded, to characterize the composition. The ESA's Venus Express was also orbiting during the encounter, providing the first opportunity for simultaneous measurement of particle-and-field characteristics of the planet. [65]

    Three Mercury flybys

    MESSENGER made a flyby of Mercury on January 14, 2008 (making its closest approach of 200 km above the surface of Mercury at 19:04:39 UTC), followed by a second flyby on October 6, 2008. [11] MESSENGER executed a final flyby on September 29, 2009, further slowing down the spacecraft. [12] [13] Sometime during the closest approach of the last flyby, the spacecraft entered safe mode. Although this had no effect on the trajectory necessary for later orbit insertion, it resulted in the loss of science data and images that were planned for the outbound leg of the fly-by. The spacecraft had fully recovered by about seven hours later. [66] One last deep space maneuver, DSM-5, was executed on November 24, 2009, at 22:45 UTC to provide the required 0.177 kilometres per second (0.110 mi/s) velocity change for the scheduled Mercury orbit insertion on March 18, 2011, marking the beginning of the orbital mission. [67]

    Orbital insertion

    The thruster maneuver to insert the probe into Mercury's orbit began at 00:45 UTC on March 18, 2011. The 0.9 km/s (0.5 mi./sec.) braking maneuver lasted about 15 minutes, with confirmation that the craft was in Mercury orbit received at 01:10 UTC on March 18 (9:10 PM, March 17 EDT). [57] Mission lead engineer Eric Finnegan indicated that the spacecraft had achieved a near-perfect orbit. [68]

    MESSENGER's orbit was highly elliptical, taking it within 200 kilometers (120 miles) of Mercury's surface and then 15,000 km (9,300 miles) away from it every twelve hours. This orbit was chosen to shield the probe from the heat radiated by Mercury's hot surface. Only a small portion of each orbit was at a low altitude, where the spacecraft was subjected to radiative heating from the hot side of the planet. [69]

    Primary science

    After MESSENGER's orbital insertion, an eighteen-day commissioning phase took place. The supervising personnel switched on and tested the craft's science instruments to ensure they had completed the journey without damage. [70] The commissioning phase "demonstrated that the spacecraft and payload [were] all operating nominally, notwithstanding Mercury's challenging environment." [33]

    The primary mission began as planned on April 4, 2011, with MESSENGER orbiting Mercury once every twelve hours for an intended duration of twelve Earth months, the equivalent of two solar days on Mercury. [33] Principal Investigator Sean Solomon, then of the Carnegie Institution of Washington, said: "With the beginning today of the primary science phase of the mission, we will be making nearly continuous observations that will allow us to gain the first global perspective on the innermost planet. Moreover, as solar activity steadily increases, we will have a front-row seat on the most dynamic magnetosphere–atmosphere system in the Solar System." [33]

    On October 5, 2011, the scientific results obtained by MESSENGER during its first six terrestrial months in Mercury's orbit were presented in a series of papers at the European Planetary Science Congress in Nantes, France. [20] Among the discoveries presented were the unexpectedly high concentrations of magnesium and calcium found on Mercury's nightside, and the fact that Mercury's magnetic field is offset far to the north of the planet's center. [20]

    Extended mission

    Topography of Mercury based on MDIS (Mercury Dual Imaging System) data MercuryTopo.png
    Topography of Mercury based on MDIS (Mercury Dual Imaging System) data

    In November 2011, NASA announced that the MESSENGER mission would be extended by one year, allowing the spacecraft to observe the 2012 solar maximum. [1] Its extended mission began on March 17, 2012, and continued until March 17, 2013. Between April 16 and 20, 2012, MESSENGER carried out a series of thruster manoeuvres, placing it in an eight-hour orbit to conduct further scans of Mercury. [71]

    In November 2012, NASA reported that MESSENGER had discovered a possibility of both water ice and organic compounds in permanently shadowed craters in Mercury's north pole. [21] [72] [73] In February 2013, NASA published the most detailed and accurate 3D map of Mercury to date, assembled from thousands of images taken by MESSENGER. [74] [75] MESSENGER completed its first extended mission on March 17, 2013, [2] and its second lasted until April 2015. [19] In November 2013, MESSENGER was among the numerous space assets that imaged Comet Encke (2P/Encke) and Comet ISON (C/2012 S1). [76] [77] [78] As its orbit began to decay in early 2015, MESSENGER was able to take highly detailed close-up photographs of ice-filled craters and other landforms at Mercury's north pole. [79] After the mission was completed, review of the radio ranging data provided the first measurement of the rate of mass loss from the Sun. [80]

    Discovery of water, organic compounds and volcanism

    On July 3, 2008, the MESSENGER team announced that the probe had discovered large amounts of water present in Mercury's exosphere, which was an unexpected finding. [83] In the later years of its mission, MESSENGER also provided visual evidence of past volcanic activity on the surface of Mercury, [84] as well as evidence for a liquid iron planetary core. [83] The probe also constructed the most detailed and accurate maps of Mercury to date, and furthermore discovered carbon-containing organic compounds and water ice inside permanently shadowed craters near the north pole. [85]

    Solar System portrait

    On February 18, 2011, a portrait of the Solar System was published on the MESSENGER website. The mosaic contained 34 images, acquired by the MDIS instrument during November 2010. All the planets were visible with the exception of Uranus and Neptune, due to their vast distances from the Sun. The MESSENGER "family portrait" was intended to be complementary to the Voyager family portrait, which was acquired from the outer Solar System by Voyager 1 on February 14, 1990. [86]

    MESSENGER captured a near-complete portrait of the Solar System during November 2010. MESSENGER Solar System Family Portrait.jpg
    MESSENGER captured a near-complete portrait of the Solar System during November 2010.

    View of a total lunar eclipse

    A lunar eclipse as viewed from Mercury, captured from the MESSENGER spacecraft. The Moon can be seen falling into the shadow of Earth. MESSENGER views 2014-10-08 lunar eclipse from Mercury orbit.gif
    A lunar eclipse as viewed from Mercury, captured from the MESSENGER spacecraft. The Moon can be seen falling into the shadow of Earth.

    On October 8, 2014 from 9:18 UTC to 10:18 UTC, MESSENGER took 31 images, taken two minutes apart, of the Earth and the Moon, as the Moon underwent a total lunar eclipse. MESSENGER was 107 million kilometers (66 million miles) from the Earth at the time of the lunar eclipse. The Earth is about 5 pixels across and the Moon is just over 1 pixel across in the field of view of the NAC, with about 40 pixels distance between them. The images are zoomed by a factor of two and the Moon's brightness has been increased by a factor of about 25 to show its disappearance more clearly. This was the first observation of a lunar eclipse, of Earth's Moon, in history to be viewed from another planet. [87] [17]

    End of mission

    After running out of propellant for course adjustments, MESSENGER entered its expected terminal phase of orbital decay in late 2014. The spacecraft's operation was extended by several weeks by exploiting its remaining supply of helium gas, which was used to pressurize its propellant tanks, as reaction mass. [88] MESSENGER continued studying Mercury during its decay period. [3] The spacecraft crashed onto the surface of Mercury on April 30, 2015, at 3:26 p.m. EDT (19:26 GMT), at a velocity of 14,080 km/h (8,750 mph), probably creating a crater in the planet's surface approximately 16 m (52 ft) wide. [18] [89] The spacecraft was estimated to have impacted at 54.4° N, 149.9° W on Suisei Planitia, near the crater Janáček. [90] The crash occurred at a place not visible from Earth at the time, and thus was not detected by any observers or instruments. NASA confirmed the end of the MESSENGER mission at 3:40 p.m. EDT (19:40 GMT) after NASA's Deep Space Network did not detect the spacecraft's reemergence from behind Mercury. [89] [91]

    MESSENGER's first (March 29, 2011) and last (April 30, 2015) images from Mercury's orbit (impact details). PIA19449-PlanetMercury-MESSENGER-Images-First-20110329-Last-20150430.jpg
    MESSENGER's first (March 29, 2011) and last (April 30, 2015) images from Mercury's orbit (impact details).

    See also

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    <span class="mw-page-title-main">Mercury (planet)</span> First planet from the Sun

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    <span class="mw-page-title-main">Mariner program</span> NASA space program from 1962 to 1973

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    The following outline is provided as an overview of and topical guide to Venus:

    References

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    58. ↑ "MESSENGER Sails on Sun's Fire for Second Flyby of Mercury". September 5, 2008. Archived from the original on May 14, 2013.
    59. ↑ "MESSENGER Launch Rescheduled" (Press release). Johns Hopkins University. March 24, 2004. Retrieved May 1, 2009.
    60. ↑ "MESSENGER Flyby Information". Johns Hopkins Applied Physics Lab. Retrieved April 30, 2023.
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    62. ↑ "MESSENGER Status Report" (Press release). NASA/APL. August 26, 2005. Archived from the original on May 13, 2013. Retrieved March 17, 2011.
    63. ↑ Anderson, J. D.; Campbell, J. K.; Ekelund, J. E.; Ellis, J.; Jordan, J. F. (2008). "Anomalous orbital-energy changes observed during spacecraft flybys of Earth". Physical Review Letters. 100 (9): 091102. Bibcode:2008PhRvL.100i1102A. doi:10.1103/physrevlett.100.091102. PMID   18352689.
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    MESSENGER
    MESSENGER - spacecraft at mercury - atmercury lg.jpg
    Artist's rendering of MESSENGER orbiting Mercury
    Mission type Mercury orbiter
    Operator NASA
    COSPAR ID 2004-030A OOjs UI icon edit-ltr-progressive.svg
    SATCAT no. 28391
    Website messenger.jhuapl.edu
    Mission duration
    • Total: 10 years, 8 months and 27 days
    • At Mercury: 4 years, 1 month and 14 days
    • En route: 7 years
    • Primary mission: 1 year
    • First extension: 1 year [1] [2]
    • Second extension: 2 years [3] [4]
    Spacecraft properties
    Manufacturer Applied Physics Laboratory
    Launch mass1,107.9 kg (2,443 lb) [5]
    Power450 watts
    Start of mission
    Launch dateAugust 3, 2004, 06:15:56 (2004-08-03UTC06:15:56Z) UTC
    Rocket Delta II 7925H-9.5
    Launch site Cape Canaveral, SLC-17B
    Entered serviceApril 4, 2011
    End of mission
    DisposalCrashed into Mercury
    DestroyedApril 30, 2015, 19:26 UTC [6]
    Orbital parameters
    Reference system Hermiocentric
    Perihermion altitude 200 km (120 mi)
    Apohermion altitude 10,300 km (6,400 mi)
    Inclination 80°
    Period 12 hours
    Epoch January 1, 2000 [7]
    Flyby of Earth (gravity assist)
    Closest approachAugust 2, 2005
    Distance2,347 km (1,458 mi)
    New Horizons spacecraft model 1.png
    Proposals
    Finalists
    Candidates
    • Underline indicates active current missions
    • Italics indicate missions yet to launch
    • Symbol † indicates failure en route or before intended mission data returned

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