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Chang'e 6

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Chang'e 6
The Chang'e 6 lander (with the ascender on top) on the far side of the Moon. The photo was taken fromJinchan,a camera-equipped mini-rover that was released from the lander.
Mission typeSurface sample return
OperatorCNSA
COSPAR ID2024-083AEdit this at Wikidata
SATCATno.59627Edit this on Wikidata
Mission duration52 days, 20 hours and 39 minutes
Spacecraft properties
ManufacturerCAST
Launch mass8,350 kg (18,410 lb)[1]
Start of mission
Launch date3 May 2024(2024-05-03)
09:27:29UTC[2][3]
RocketLong March 5
Launch siteWenchang
End of mission
Landing date25 June 2024
06:07 UTC
Return capsule
Landing siteInner Mongolia,China
Lunarorbiter
Orbital insertion8 May 2024
02:12 UTC[4]
Orbital departure20 June 2024
~15:00 UTC
Orbital parameters
Periapsis altitude220 km (140 mi)
Inclination137°
Lunarlander
Landing date1 June 2024
22:23:16UTC[5][6]
Return launch3 June 2024
23:38:10UTC[7]
Landing siteSouthern mare ofApollo Basin
41°38′19″S153°59′07″W/ 41.6385°S 153.9852°W/-41.6385; -153.9852[8][9]
Sample mass1,935.3 g (68.27 oz)[10][11]
JinchanLunarrover
Landing date1 June 2024
22:23:16UTC[5][6]
Landing siteSouthern mare ofApollo Basin[8]
Docking with Sample Ascender
Docking date6 June 2024
06:48UTC[12]
Undocking date6 June 2024
Chang'e probes

Chang'e 6(Chinese:Thường Nga số 6;pinyin:Cháng'é liùhào) was the sixth roboticlunar explorationmission by theChina National Space Administration(CNSA) and the second CNSA lunarsample-returnmission. Like its predecessors in theChinese Lunar Exploration Program,the spacecraft is named after the Chinese moon goddessChang'e.It was humanity's first lunar mission to retrieve samples from thefar side of the Moon,as all previous collective sample-return missions were done from thenear side.[13]

The mission began on 3 May 2024 when the spacecraft was launched fromWenchang Space Launch SiteonHainan Island.Itslanderandrovertouched down on the lunar far side on 1 June 2024.[14][5]The lander's robotic scoop and drill took samples with a total mass of 1935.3 grams from the lunar surface; the ascender module then carried these into lunar orbit on 3 June 2024.[15][11]The ascender docked with the orbiter module in lunar orbit on 6 June 2024 and transferred the samples to an atmospheric re-entry module which then returned to Earth. The mission's lander and rover also conducted scientific experiments on the lunar surface.

The overall mission lasted about 53 days, ending on 25 June 2024 with the return capsule re-entering the atmosphere with the samples, landing by parachute inInner Mongolia.[16]

Overview[edit]

Further information:Chinese Lunar Exploration Program
See also:Lunar south poleandfar side of the Moon

TheChinese Lunar Exploration Programis designed to be conducted in four[17]phases of incremental technological advancement:

  • The goal of the first phase was to reachlunar orbit.This was completed byChang'e 1in 2007 and byChang'e 2in 2010.
  • The second phase sought to land and rove on the Moon, a feat that was accomplished byChang'e 3in 2013 and byChang'e 4in 2019.
  • The third phase involves the collection of lunar samples and sending them to Earth, first completed byChang'e 5in 2020 and, for the first time from thefar sideby Chang'e 6 in 2024.
  • The fourth phase consists of the development of a robotic research station near the Moon's south pole.[17][18][19]The program aims to facilitate crewed lunar landings in the 2030s and possibly build a crewed outpost near thelunar south pole.[20]

The preceding Chang'e 5 mission returned 1.731 kilograms (3.82 lb) of material from the northern hemisphere of the lunar near side.

The Chang'e 6 mission landed on the southern hemisphere of the lunar far side to gather more material. Specifically, the landing segment of the Chang'e 6 mission touched down in a relatively flat area lying in the southern portion of theApollo crater,which itself lies within the largerSouth Pole-Aitken(SPA) impact basin on the lunar far side. Scientists hope that the samples collected from the landing area may include lunarmantlematerial ejected by the original impact that created the SPA basin, material which can shed light on the differences that exist between the lunar near-side and far-side, and on the origin of the Moon and the Solar System.[2]

The Chang'e 6 lander landed at 22:23UTCon 1 June 2024 in the southern mare ofApollo Basin(lunar coordinates:41°38′19″S153°59′07″W/ 41.6385°S 153.9852°W/-41.6385; -153.9852).[5][21]After the completion of sample collection and the placement of the sample on the ascender by the probe's robotic drill and robotic arm, the ascender took off from atop the lander portion of the probe at 23:38 UTC on 3 June 2024.[7][22]The ascender docked with the Chang'e 6 service module (the orbiter) in lunar orbit at 06:48 UTC on 6 June 2024 and subsequently completed the transfer of the sample container to the Earth return module at 07:24 UTC on the same day.[23]On 25 June 2024, the return capsule landed inInner Mongolia.[24]

The mission's lander collected 1,935.3 grams (68.27 oz) of lunar far-side material including surface soil and rocks (using a scoop) and subsurface samples (using a drill).[11]With the return capsule's re-entry back to Earth, China became the first nation to bring back samples from the far side of the Moon.[16]

The hole left by the sampling was in the shape of the characterzhong(Trung) which is the initial character ofChina's nameZhōngguóTrung Quốc.This symbolism went viral onWeibo.[25]

Mission architecture[edit]

Chang'e 6 was built as a copy of and backup toChang'e 5.[26]The mission is reported to consist of four modules:

  • Lander:landed on the lunar surface after separating from the Orbiter, equipped with a drill and a scooping device. The Ascender was on the top of the Lander. It collected about 2 kg (4.4 lb) of samples from 2 metres (6.6 ft) below the surface[27]and placed them in the attached ascent vehicle to be launched into lunar orbit.
  • Ascender:The ascent vehicle then made a fully autonomous and roboticLunar orbit rendezvousand docking with Orbiter where the samples were robotically transferred into a sample-return capsule for their delivery to Earth.[28][29]
  • Orbiter:after the samples were transported from the Ascender to the Orbiter, the Orbiter left lunar orbit and spent ~4.5 days flying back toEarth orbitand released the Returner (reentry capsule) just before arrival.
  • Returner:The Returner will perform askip reentryto bounce off the atmosphere once before formal reentering.

The estimated launch mass is 8,200 kg (18,100 lb)—the lander is projected to be 3,200 kg (7,100 lb) and the ascent vehicle is about 700 kg (1,500 lb).[30][28][31]

Science payloads[edit]

In October 2018, CNSA announced that it would call for international partners to propose an additional payload up to 10 kg (22 lb) to be included in this mission.[32]In November 2022, it was announced that the mission would carry payloads from four international partners:[33][34]

Lander[edit]

  • A French instrument calledDORN(Detection of OutgassingRadon) to study the transport of lunar dust and other volatiles between thelunar regolithand thelunar exosphere,including thewater cycle.[35]
  • The Italian instrument INRRI (INstrument for landing-Roving laser Retroreflector Investigations) consists of a retroreflector that precisely measures distances from the lander to orbit,[36]similar to those used in theSchiaparelliandInSightmissions.
  • The Swedish NILS (Negative Ions on Lunar Surface), an instrument to detect and measure negative ions reflected by the lunar surface.[37]

Orbiter[edit]

Jinchan mini-rover[edit]

Chang'e 6 carried a ~5kg (~11lb) mini-rover named "Jinchan" (Chinese: Kim thiềm ), or "Golden Toad," due to its gold-sheeted insulating exterior. It is described as an "autonomous intelligent mini-robot" by its developer,CASC.[14][40]Outfitted with its own micro solar panels, the rover was designed to support research into the composition of the lunar surface, the presence of water ice in the lunar soil via animaging infrared spectrometer.[41]Additionally, Jinchan was tasked to image the Chang'e 6 lander on the lunar surface and was equipped cameras on both sides for redundancy purposes. Following the sample collection process, "the mini rover autonomously detached from the lander, moved to a suitable position, selected an ideal angle for the photograph and then captured the image."[42]

Mission stages[edit]

Chang'e 6 Landing Region in South of Apollo Basin, South Pole-Aitken Basin[43]

Launch[edit]

Before/after animation showing Chang'e 6 lander as photographed by theNASA'sLunar Reconnaissance Orbiter.[44]

The probe was launched by aLong March 5rocket at 09:27 UTC, on 3 May 2024, fromWenchang Satellite Launch CenteronHainan Island.[45][46]

Earth–Moon transfer[edit]

After launch, Chang'e 6 entered a 12-hour orbit around the Moon at 02:12 UTC, on 8 May 2024.[4]

The lander/ascender/rover separated from the orbiter/returner on 30 May 2024, in preparation for landing.[47]

Landing[edit]

At 22:06 UTC, on 1 June 2024, the Chang'e 6 lander/ascender, with the support of theQueqiao-2relay satellite, descended from its 200 kilometer (124 miles) orbit altitude.[47][48]It used its autonomous obstacle avoidance system, visible light camera, and laser 3D scanner to detect and avoid lunar obstacles and uneven terrain. At 22:23 UTC, it landed in the preselected area of theSouth Pole–Aitken basinon the far side of the Moon.[47]The engine was cut for the final approach and a cushioning system was used for the freefall touchdown.[49]

Return[edit]

At 23:38 UTC on 3 June 2024, the Chang'e 6 ascender (carrying the samples) took off from the far side of the Moon and entered the predetermined circumlunar orbit. This was the world's first sampling and takeoff on the far side of the Moon.[50][51]

At 06:48 UTC on 6 June, 2024, the Chang'e 6 ascender rendezvoused and docked with the orbiter/returner in lunar orbit. At 07:24 UTC, the lunar sample container was safely transferred to the returner.[12]

On 21 June 2024, the service module of Chang'e 6 likely fired its engines to return to Earth from lunar orbit. CNSA has not provided an updates on the mission. Some amateur optical and radio observers reported a probable engine burning.[52]

The re-entry to earth happened on 25 June 2024.[53]An atmospheric re-entry module of about 300 kilograms separated from the service module which had flown back from the Moon.[53]This then decelerated byskipping off the atmosphereover the Atlantic before its final descent.[53]This capsule containing about 2 kilograms of samples landed by parachute at 06:07 UTC in the predesignated landing area ofSiziwang BannerinInner Mongolia.[24]Search teams waiting for the capsule reached it within minutes using helicopters.[24]

The samples will be studied by Chinese scientists in collaboration with international experts. In the previous case ofChang'e 5in 2020, direct access to samples by international partners started about three years after their return.[24]

See also[edit]

References[edit]

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