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</ref><ref name="CY2_FAQ2">{{cite web|url=https://www.isro.gov.in/chandrayaan2-faq|title=Chandrayaan-2 FAQ|accessdate=24 August 2019|quote=The name Chandrayaan means “Chandra- Moon, Yaan-vehicle”, –in Indian languages (Sanskrit and Hindi), – the lunar spacecraft.}}</ref> {{audio|Chandrayaan.ogg|pronunciation}}) is the second [[lunar exploration]] mission developed by the [[Indian Space Research Organisation]] (ISRO),<ref>{{cite web |last=Kumar |first=Chethan |url=https://timesofindia.indiatimes.com/india/chandrayaan-2-nearly-ready-for-july-launch/articleshow/69724508.cms |title=Chandrayaan-2 nearly ready for July launch |work=The Times of India |date=10 June 2019 |accessdate=14 July 2019}}</ref><ref>{{cite news|url=https://www.thehindu.com/sci-tech/science/isro-gears-up-for-chandrayaan-2-mission/article27705909.ece|title=ISRO gears up for Chandrayaan-2 mission|newspaper=The Hindu|date=9 June 2019|last1=d. s|first1=Madhumathi}}</ref> after [[Chandrayaan-1]].<ref>{{cite news |url=http://indianexpress.com/article/technology/science/isro-begins-flight-integration-activity-for-chandrayaan-2-as-scientists-tests-lander-and-rover-4905883/ |title=ISRO begins flight integration activity for Chandrayaan-2, as scientists tests lander and rover |work=The Indian Express |agency=Press Trust of India |date=25 October 2017 |accessdate=21 December 2017}}</ref><ref name="ISRO20190501" /> It consists of a lunar [[orbiter]], the ''Vikram'' [[Lander (spacecraft)|lander]], and the [[Pragyan (rover)|''Pragyan'' lunar rover]], all of which were developed in India.<ref>{{cite news |url=https://www.ndtv.com/india-news/chandrayaan-2-delayed-israel-could-beat-india-in-race-to-moons-surface-1895221 |title=India Slips in Lunar Race with Israel As Ambitious Mission Hits Delays |work=NDTV |first=Pallava |last=Bagla |date=4 August 2018 |accessdate=15 August 2018}}</ref> The main scientific objective is to map the location and abundance of [[lunar water]] via ''Pragyan'', and ongoing analysis from the orbiter circling at a lunar polar orbit of {{Nowrap|100 × 100 km}}. <ref name="Hindu2">{{cite news |url=http://www.thehindu.com/todays-paper/article1777631.ece |title=ISRO plans Moon rover |work=The Hindu |first=T. S. |last=Subramanian |date=4 January 2007 |accessdate=22 October 2008}}</ref><ref>{{Cite web |url=http://164.100.158.235/question/annex/241/Au1084.pdf |title=Question No. 1084: Deployment of Rover on Lunar Surface |publisher=[[Rajya Sabha]] |first1=T. |last1=Rathinavel |author1-link=T. Rathinavel |first2=Jitendra |last2=Singh |author2-link=Jitendra Singh (BJP politician) |date=24 November 2016}}</ref><ref name="Launchkit_gl">{{Cite web |url=https://www.isro.gov.in/gslv-mk-iii-m1-chandrayaan-2-mission/launch-kit-glance |title= Launch kit at a glance}}</ref> |
</ref><ref name="CY2_FAQ2">{{cite web|url=https://www.isro.gov.in/chandrayaan2-faq|title=Chandrayaan-2 FAQ|accessdate=24 August 2019|quote=The name Chandrayaan means “Chandra- Moon, Yaan-vehicle”, –in Indian languages (Sanskrit and Hindi), – the lunar spacecraft.}}</ref> {{audio|Chandrayaan.ogg|pronunciation}}) is the second [[lunar exploration]] mission developed by the [[Indian Space Research Organisation]] (ISRO),<ref>{{cite web |last=Kumar |first=Chethan |url=https://timesofindia.indiatimes.com/india/chandrayaan-2-nearly-ready-for-july-launch/articleshow/69724508.cms |title=Chandrayaan-2 nearly ready for July launch |work=The Times of India |date=10 June 2019 |accessdate=14 July 2019}}</ref><ref>{{cite news|url=https://www.thehindu.com/sci-tech/science/isro-gears-up-for-chandrayaan-2-mission/article27705909.ece|title=ISRO gears up for Chandrayaan-2 mission|newspaper=The Hindu|date=9 June 2019|last1=d. s|first1=Madhumathi}}</ref> after [[Chandrayaan-1]].<ref>{{cite news |url=http://indianexpress.com/article/technology/science/isro-begins-flight-integration-activity-for-chandrayaan-2-as-scientists-tests-lander-and-rover-4905883/ |title=ISRO begins flight integration activity for Chandrayaan-2, as scientists tests lander and rover |work=The Indian Express |agency=Press Trust of India |date=25 October 2017 |accessdate=21 December 2017}}</ref><ref name="ISRO20190501" /> It consists of a lunar [[orbiter]], the ''Vikram'' [[Lander (spacecraft)|lander]], and the [[Pragyan (rover)|''Pragyan'' lunar rover]], all of which were developed in India.<ref>{{cite news |url=https://www.ndtv.com/india-news/chandrayaan-2-delayed-israel-could-beat-india-in-race-to-moons-surface-1895221 |title=India Slips in Lunar Race with Israel As Ambitious Mission Hits Delays |work=NDTV |first=Pallava |last=Bagla |date=4 August 2018 |accessdate=15 August 2018}}</ref> The main scientific objective is to map the location and abundance of [[lunar water]] via ''Pragyan'', and ongoing analysis from the orbiter circling at a lunar polar orbit of {{Nowrap|100 × 100 km}}. <ref name="Hindu2">{{cite news |url=http://www.thehindu.com/todays-paper/article1777631.ece |title=ISRO plans Moon rover |work=The Hindu |first=T. S. |last=Subramanian |date=4 January 2007 |accessdate=22 October 2008}}</ref><ref>{{Cite web |url=http://164.100.158.235/question/annex/241/Au1084.pdf |title=Question No. 1084: Deployment of Rover on Lunar Surface |publisher=[[Rajya Sabha]] |first1=T. |last1=Rathinavel |author1-link=T. Rathinavel |first2=Jitendra |last2=Singh |author2-link=Jitendra Singh (BJP politician) |date=24 November 2016}}</ref><ref name="Launchkit_gl">{{Cite web |url=https://www.isro.gov.in/gslv-mk-iii-m1-chandrayaan-2-mission/launch-kit-glance |title= Launch kit at a glance}}</ref> |
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The mission was launched to the [[Moon]] from the [[Satish Dhawan Space Centre Second Launch Pad|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).<ref name="gslv3">{{cite news |url=https://timesofindia.indiatimes.com/india/chandrayaan-2-launch-put-off-india-israel-in-lunar-race-for-4th-position/articleshow/65275012.cms |title=Chandrayaan-2 launch put off: India, Israel in lunar race for 4th position |work=The Times of India |agency=Times News Network |first=Surendra |last=Singh |date=5 August 2018 |accessdate=15 August 2018}}</ref><ref name="gslv2" /><ref>{{Cite web | url=https://www.indiatoday.in/science/story/chandrayaan-2-launch-bahubali-rocket-takeoff-2-43-pm-monday-1572017-2019-07-21 |title = Chandrayaan-2 Launch Mission: Bahubali rocket set to take-off at 2:43 pm today}}</ref> The craft reached the Moon's orbit on 20 August 2019 and began orbital positioning manoeuvres for the landing of the ''Vikram'' lander.<ref>{{cite web | url = https://www.cnn.com/2019/08/20/asia/chandrayaan-2-india-lunar-orbit-scli-intl/index.html | title = India's Chandrayaan-2 moon mission enters lunar orbit | first1 = Ivana | last1 = Kottasová | first2 = Swati | last2 = Gupta | date = 20 August 2019 | accessdate = 6 September 2019 | work = [[CNN]] }}</ref> ''Vikram'' and the rover were scheduled to land on the near side of the Moon, in the [[Lunar south pole|south polar region]]<ref name="Rishitosh 2019">[https://www.hou.usra.edu/meetings/lpsc2019/pdf/1493.pdf 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).</ref> at a latitude of about 70° south at approximately 1:50 am on 7 September 2019 and conduct scientific experiments for one lunar day, lasting two Earth weeks. |
The mission was launched to the [[Moon]] from the [[Satish Dhawan Space Centre Second Launch Pad|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).<ref name="gslv3">{{cite news |url=https://timesofindia.indiatimes.com/india/chandrayaan-2-launch-put-off-india-israel-in-lunar-race-for-4th-position/articleshow/65275012.cms |title=Chandrayaan-2 launch put off: India, Israel in lunar race for 4th position |work=The Times of India |agency=Times News Network |first=Surendra |last=Singh |date=5 August 2018 |accessdate=15 August 2018}}</ref><ref name="gslv2" /><ref>{{Cite web | url=https://www.indiatoday.in/science/story/chandrayaan-2-launch-bahubali-rocket-takeoff-2-43-pm-monday-1572017-2019-07-21 |title = Chandrayaan-2 Launch Mission: Bahubali rocket set to take-off at 2:43 pm today}}</ref> The craft reached the Moon's orbit on 20 August 2019 and began orbital positioning manoeuvres for the landing of the ''Vikram'' lander.<ref>{{cite web | url = https://www.cnn.com/2019/08/20/asia/chandrayaan-2-india-lunar-orbit-scli-intl/index.html | title = India's Chandrayaan-2 moon mission enters lunar orbit | first1 = Ivana | last1 = Kottasová | first2 = Swati | last2 = Gupta | date = 20 August 2019 | accessdate = 6 September 2019 | work = [[CNN]] }}</ref> ''Vikram'' and the rover were scheduled to land on the near side of the Moon, in the [[Lunar south pole|south polar region]]<ref name="Rishitosh 2019">[https://www.hou.usra.edu/meetings/lpsc2019/pdf/1493.pdf 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).</ref> at a latitude of about 70° south at approximately 1:50 am on 7 September 2019 and conduct scientific experiments for one lunar day, lasting two Earth weeks. |
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However, the lander deviated from its intended trajectory starting at {{convert|2.1|km|mi}} altitude,<ref>{{cite web|url=https://timesofindia.indiatimes.com/india/extra-brake-thrust-may-have-sent-vikram-out-of-control-in-home-stretch/articleshow/71030431.cms|title=Extra brake thrust may have sent Vikram out of control in home stretch}}</ref> and lost communication when touchdown confirmation was expected.<ref name='Patel MIT'/> Initial reports suggesting a crash<ref name='Apparent crash'/><ref name="planetary landing">{{Cite web|url=http://www.planetary.org/blogs/jason-davis/vikram-apparently-crash-lands.html|title=India's Vikram Spacecraft Apparently Crash-Lands on Moon|website=www.planetary.org|language=en|access-date=7 September 2019}}</ref> have been confirmed by ISRO chairman K. Sivan, stating that the lander location had been found, and "it must had been a hard landing".<ref name='Hard landing TOI'> [https://timesofindia.indiatimes.com/india/vikram-lander-located-did-not-soft-land-on-moon-isro/articleshow/71037009.cms Vikram lander located on lunar surface, wasn't a soft landing: Isro.] ''Times of India''. 8 September 2019.</ref> |
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As of 8 September 2019, on going efforts are being made by ISRO in hopes to restore communications with ''Vikram''. 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. |
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==History== |
==History== |
Revision as of 21:26, 10 September 2019
This article documents a current or recent spaceflight. Details may change as the mission progresses. Initial news reports may be unreliable. The last updates to this article may not reflect the most current information. For more information please see WikiProject Spaceflight. |
![]() Chandrayaan-2 composite | |
Mission type | Lunar orbiter, lander, rover |
---|---|
Operator | Indian Space Research Organisation (ISRO) |
COSPAR ID | 2019-042A |
SATCAT no. | 2019-042A |
Website | www |
Mission duration | Orbiter: ~ 7 years Vikram lander ≤ 14 days[1][2] Pragyan rover: ≤ 14 days[2] |
Spacecraft properties | |
Manufacturer | Indian Space Research Organisation (ISRO) |
Launch mass | Combined (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] |
Power | Orbiter: 1 kW[7]
Vikram lander: 650 W Pragyan rover: 50 W |
Start of mission | |
Launch date | 22 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 insertion | 20 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] |
Inclination | 90° (polar orbit) |
Moon lander | |
Spacecraft component | Rover |
Landing date | 7 September 2019, 01:55 IST (6 September 2019, 20:25 UTC) [14][12] |
Chandrayaan-2 (candra-yāna, transl. "mooncraft";[15][16] ) 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 the location and abundance of lunar water via Pragyan, and ongoing analysis from the orbiter circling at a lunar polar orbit of 100 × 100 km. [22][23][24]
The mission was launched 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][25] The craft reached the Moon's orbit on 20 August 2019 and began orbital positioning manoeuvres for the landing of the Vikram lander.[26] Vikram and the rover were scheduled to land on the near side of the Moon, in the south polar region[27] at a latitude of about 70° south at approximately 1:50 am on 7 September 2019 and conduct scientific experiments for one lunar day, lasting two Earth weeks.
However, the lander deviated from its intended trajectory starting at 2.1 kilometres (1.3 mi) altitude,[28] and lost communication when touchdown confirmation was expected.[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 had been a hard landing".[32]
As of 8 September 2019, on going efforts are being made by ISRO in hopes to restore communications with Vikram. 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]
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]
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[update], 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
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/GSLV_Mk_III_M1%2C_Chandrayaan-2_-_Orbiter_at_SDSC_SHAR_01.jpg/150px-GSLV_Mk_III_M1%2C_Chandrayaan-2_-_Orbiter_at_SDSC_SHAR_01.jpg)
As of September 2019, orbiter is orbiting the Moon on a polar orbit at an altitude of 100 km (62 mi).[55] The orbiter carries eight scientific instruments; two of them 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]
- Dimensions: 3.2 × 5.8 × 2.2 m[24]
- Gross lift-off mass: 2,379 kg (5,245 lb)[3]
- Propellant mass: 1,697 kg (3,741 lb)[6]
- Dry mass: 682 kg (1,504 lb)[6]
- Power generation capacity: 1000 W[24]
- Mission duration: approximately 7.5 years, extended from the planned 1 year owing to the precise launch and mission management, in lunar orbit.[1][59]
Vikram lander
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/GSLV_Mk_III_M1%2C_Chandrayaan-2_-_Pragyan_rover_mounted_on_the_ramp_of_Vikram_lander.jpg/220px-GSLV_Mk_III_M1%2C_Chandrayaan-2_-_Pragyan_rover_mounted_on_the_ramp_of_Vikram_lander.jpg)
The mission's lander is called Vikram (Sanskrit: विक्रम, lit. 'Valour[61]') 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]
- Dimensions: 2.54 × 2 × 1.2 m[24]
- Gross lift-off mass: 1,471 kg (3,243 lb)[3]
- Propellant mass: 845 kg (1,863 lb)[6]
- Dry mass: 626 kg (1,380 lb)[6]
- Power generation capability: 650 W
- Mission duration: ≤14 days (one lunar day)[2]
Pragyan rover
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Pragyaan_Lunar_Rover_for_Chandrayaan-2.png/220px-Pragyaan_Lunar_Rover_for_Chandrayaan-2.png)
The mission's rover is called Pragyan (Sanskrit: प्रज्ञान, lit. 'Wisdom[73][74]') )[75][73] The rover's mass is about 27 kg (60 lb) and will operate on solar power.[4][5] The rover will move on 6 wheels traversing 500 meters on the lunar surface at the rate of 1 cm per second, performing on-site chemical analysis and sending the data to the lander, which will relay it to the Mission Control on the Earth.[76][77][37][56][52] For navigation, the rover uses:
- Stereoscopic camera-based 3D vision: two 1 megapixel, monochromatic NAVCAMs in front of the rover will provide the ground control team a 3D view of the surrounding terrain, and help in path-planning by generating a digital elevation model of the terrain.[78] IIT Kanpur contributed to the development of the subsystems for light-based map generation and motion planning for the rover.[79]
- Control and motor dynamics: the rover has a rocker-bogie suspension system and six wheels, each driven by independent brushless DC electric motors. Steering is accomplished by differential speed of the wheels or skid steering.[80]
The expected operating time of Pragyan rover is one lunar day or around 14 Earth days as its electronics are not expected to endure the frigid lunar night. However, its power system has a solar-powered sleep/wake-up cycle implemented, which could result 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]
- Dimensions: 0.9 × 0.75 × 0.85 m[24]
- Power: 50 W[24]
- Travel speed: 1 cm/sec.[24]
- Mission duration: ≤14 days (one lunar day)
Payload
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Chandrayaan-2_Mission_Overview.jpg/220px-Chandrayaan-2_Mission_Overview.jpg)
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]
- Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS) from ISRO Satellite Centre (ISAC), makes use of X-ray fluorescence spectra to determine the elemental composition of the lunar surface.
- Solar X-ray monitor (XSM) from Physical Research Laboratory (PRL), Ahmedabad for mapping major elements present on the lunar surface.[37]
- Dual Frequency L and S band Synthetic Aperture Radar (DFSAR) from Space Applications Centre (SAC) for probing the first few meters of the lunar surface for the presence of different constituents, including water ice. DFSAR is expected to provide further evidence confirming the presence of water ice, and its distribution below the shadowed regions of the Moon.[37] It has lunar surface penetration depth of 5 meters (L-band).[59][92]
- Imaging IR Spectrometer (IIRS) from Space Applications Centre (SAC) for mapping of lunar surface over a wide wavelength range for the study of minerals, water molecules and hydroxyl present.[37] It works up to 5 microns, an improvement over previous lunar missions whose payloads worked up to 3 microns.[59]
- Chandrayaan-2 Atmospheric Compositional Explorer 2 (ChACE-2) Quadrupole Mass Analyzer from Space Physics Laboratory (SPL) to carry out a detailed study of the lunar exosphere.[37]
- Terrain Mapping Camera-2 (TMC-2) from Space Applications Centre (SAC) for preparing a three-dimensional map essential for studying the lunar mineralogy and geology.[37]
- Radio Anatomy of Moon Bound Hypersensitive Ionosphere and Atmosphere – Dual Frequency Radio Science experiment (RAMBHA-DFRS) by SPL for the studying electron density in the Lunar ionosphere.
- Orbiter High Resolution Camera (OHRC) by SAC for scouting a hazard-free spot prior to landing. It will later help prepare high-resolution topographic maps and digital elevation models of the lunar surface. OHRC has spatial resolution of 0.3 m from 100 km polar orbit.[86]
Vikram lander
The payloads on the Vikram lander are:[3][86]
- Instrument for Lunar Seismic Activity (ILSA) MEMS based Seismometer by LEOS for studying Moon-quakes near the landing site[85][13][93]
- Chandra's Surface Thermo-physical Experiment (ChaSTE) Thermal probe for estimating the thermal properties of the lunar surface[13]
- RAMBHA-LP Langmuir probe for measuring the density and variation of lunar surface plasma.[85][13]
- A laser retroreflector array (LRA) by NASA Goddard Space Flight Center for taking precise measurements of distance between the reflector on the lunar surface and satellites in lunar orbit.[94][89][90] The micro-reflector weighs about 22 grams and can not be used for taking observations from Earth-based lunar laser stations.[90]
Pragyan rover
Pragyan rover carries two instruments to determine the abundance of elements near the landing site:[3][86]
- Laser induced Breakdown Spectroscope (LIBS) from Laboratory for Electro Optic Systems (LEOS), Bangalore.[37]
- Alpha Particle Induced X-ray Spectroscope (APXS) from PRL, Ahmedabad.
Mission profile
Phase | Date | Event | Detail | Result | References | |
---|---|---|---|---|---|---|
Apogee / Aposelene |
Perigee / Periselene | |||||
Geocentric phase | 22 July 2019 09:13:12 UTC | Launch | Burn time: 16 min 14 sec | 45,475 km (28,257 mi) | 169.7 km (105.4 mi) | [48] |
24 July 2019 09:22 UTC | 1st orbit-raising maneuver | Burn time: 48 sec | 45,163 km (28,063 mi) | 230 km (140 mi) | [97] | |
25 July 2019 19:38 UTC | 2nd orbit-raising maneuver | Burn time: 883 sec | 54,829 km (34,069 mi) | 251 km (156 mi) | [98] | |
29 July 2019 09:42 UTC | 3rd orbit-raising maneuver | Burn time: 989 sec | 71,792 km (44,609 mi) | 276 km (171.5 mi) | [99] | |
2 August 2019 09:57 UTC | 4th orbit-raising maneuver | Burn time: 646 sec | 89,472 km (55,595 mi) | 277 km (172 mi) | [100] | |
6 August 2019 09:34 UTC | 5th orbit-raising maneuver | Burn time: 1041 sec | 142,975 km (88,841 mi) | 276 km (171 mi) | [101] | |
13 August 2019 20:51 UTC | Trans-lunar injection | Burn time: 1203 sec | [102] | |||
Selenocentric phase | 20 August 2019 03:32 UTC | Lunar orbit insertion 1st lunar bound maneuver |
Burn time: 1738 sec | 18,072 km (11,229 mi) | 114 km (71 mi) | [103] |
21 August 2019 07:20 UTC | 2nd lunar bound maneuver | Burn time: 1228 sec | 4,412 km (2,741 mi) | 118 km (73 mi) | [104] | |
28 August 2019 03:34 UTC | 3rd lunar bound maneuver | Burn time: 1190 sec | 1,412 km (877 mi) | 179 km (111 mi) | [105] | |
30 August 2019 12:48 UTC | 4th lunar bound maneuver | Burn time: 1155 sec | 164 km (102 mi) | 124 km (77 mi) | [106] | |
1 September 2019 12:51 UTC | 5th lunar bound maneuver | Burn time: 52 sec | 127 km (79 mi) | 119 km (74 mi) | [107] | |
Vikram lunar landing | 2 September 2019 7:45 UTC | Vikram separation | 127 km (79 mi) | 119 km (74 mi) | [108] | |
3 September 2019 3:20 UTC | 1st deorbit burn | Burn time: 4 sec | 128 km (80 mi) | 104 km (65 mi) | [109] | |
3 September 2019 22:12 UTC | 2nd deorbit burn | Burn time: 9 sec | 101 km (63 mi) | 35 km (22 mi) | [110] | |
6 September 2019 01:38 UTC | Powered descent | |||||
6 September 2019 01:55 UTC | Vikram landing | Trajectory deviation started at 2.1 km altitude,[29] telemetry was lost seconds before touchdown.[29] | ||||
7 September 2019 05:25 UTC (planned) | Pragyan rover deployment |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/20/GSLV_Mk_III_M1%2C_Chandrayaan-2_Lifting_off_01.jpg/220px-GSLV_Mk_III_M1%2C_Chandrayaan-2_Lifting_off_01.jpg)
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][111][112]
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][113][114] This also resulted in the saving of around 40 kg fuel onboard the spacecraft.[115]
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.[116][117]
Geocentric phase
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Chandrayaan2_trajectory.png/220px-Chandrayaan2_trajectory.png)
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[101] followed by trans-lunar injection on 13 August 2019.[102] 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.[118] 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.[103] 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[104][105][106][107] followed by separation of Vikram lander from the orbiter on 7:45 UTC, 2 September 2019.[108]
Planned landing site
Landing site [119] | Coordinates |
---|---|
Prime landing site | 70°54′10″S 22°46′52″E / 70.90267°S 22.78110°E |
Alternate landing site | 67°52′27″S 18°28′10″W / 67.87406°S 18.46947°W |
Two landing sites were selected, each with a landing ellipse of 32 × 11 km.[119] The prime landing site (PLS54) is at 70.90267 S 22.78110 E (~350 km north of the South Pole-Aitken Basin rim[27][119]), 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,[120][27] on the near side of the Moon.
Failed landing
Vikram separated from Chandrayaan-2 on 7 September 2019 and was scheduled to land on the Moon at around 1:50 a.m. IST. The initial descent was considered within mission parameters, passing critical braking procedures as expected. The descent and soft-landing were to be done by the on-board computers on Vikram, with mission control unable to make corrections.[121]
The lander's trajectory began to deviate at about 2.1 kilometres (1.3 mi; 6,900 ft) above the surface.[122] The final telemetry readings during ISRO's live-stream show that Vikram's final vertical velocity was 58 m/s (210 km/h) from 330 meters above the surface which, according to the MIT Technology Review, is "quite fast for a lunar landing."[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][123][124] The mission's orbiter used thermal imaging to locate the lander. There are unconfirmed reports, citing an ISRO official, that the lander is intact, [125] but there has not been an official announcement of the physical status of the lander by ISRO.[32][126] K. Sivan has tasked senior scientist P. S. Goel to head the Failure Analysis Committee to look into the causes of the failure.[127] As of 8 September 2019, ongoing efforts are being made by ISRO in hopes to restore communications with Vikram.[128] The orbiter part of the mission, with eight scientific instruments, remains operational and will continue its seven-year mission to study the Moon.
Team
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/A_view_of_Mission_Operations_Complex_1_%28MOX-1%29_at_ISTRAC%2C_Peenya_before_commencement_of_fourth_orbit_raising_burn_for_Chandrayaan-2.jpg/220px-A_view_of_Mission_Operations_Complex_1_%28MOX-1%29_at_ISTRAC%2C_Peenya_before_commencement_of_fourth_orbit_raising_burn_for_Chandrayaan-2.jpg)
Key scientists and engineers involved in the development of Chandrayaan-2 include:[130][131][132]
- Mylswamy Annadurai – Project Director, Chandrayaan-2
- Ritu Karidhal – Mission Director, Chandrayaan-2
- Muthayya Vanitha – Project Director, Chandrayaan-2
- Chandrakanta Kumar – Deputy Project Director (Radio frequency systems), Chandrayaan-2
- Amitabh Singh – Deputy Project Director (Optical Payload Data Processing, SAC), Chandrayaan-2[133]
See also
- Chandrayaan programme
- Chandrayaan-1
- Exploration of the Moon
- List of current and future lunar missions
- List of ISRO missions
- Lunar resources
References
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{{cite web}}
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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.
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Lander (Vikram) is undergoing final integration tests. Rover (Pragyan) has completed all tests and waiting for the Vikram readiness to undergo further tests.
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{{cite web}}
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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.
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CY2_payloads2
was invoked but never defined (see the help page). - ^ Mallikarjun, Y. (29 May 2013). "India plans to send seismometer to study moonquakes". The Hindu. Retrieved 1 June 2013.
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- ^ a b c 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.
- ^ Srishti Choudhary (14 July 2019). "Chandrayaan-2: How 'Lander Vikram' will touchdown on the moon?". Live Mint.
- ^ Chandrayaan 2: Here's everything about ISRO Moon-landing its Vikram lander. Financial Express. Ribhu Mishra, 7 September 2019.
- ^ India Just Found Its Lost Vikram Lander on the Moon, Still No Signal. Tariq Malik ,Space. 8 September 2019.
- ^ "Lander Vikram located: K Sivan". www.aninews.in. Retrieved 8 September 2019.
- ^ 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.
- ^ "Lander 'tilted' not broken, says ISRO". PTI. 9 September 2019.
{{cite news}}
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ignored (help) - ^ India Locates Its Lost Vikram Lander on the Moon. Tariq Malik, Scientific American. 9 September 2019.
- ^ Hard landing derailed lunar mission, says K Sivan. Raghu Krishnan, The Economic Times, 9 September 2019.
- ^ Chandrayaan-2 - Latest Updates. ISRO. Accessed on 10 September 2019.
- ^ "At Bangalore mission control,all eyes on Mars". 16 December 2013. Retrieved 2 August 2019.
- ^ The women, and men, behind Chandrayaan 2. Madhumathi D.S., The Hindu. 15 July 2019.
- ^ Chandrayaan-2: India launches second Moon mission. BBC News. 22 July 2019.
- ^ "Chandrayaan-2 deputy project director taught village students to fund his education". The Times of India. 30 July 2019. Retrieved 23 August 2019.
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: CS1 maint: url-status (link) - ^ "Amitabh Singh | M Tech. | Indian Space Research Organization, Bengaluru | ISRO | signal & Image Processing | ResearchGate". ResearchGate. Retrieved 26 August 2019.
External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- Official Chandrayaan-2 mission page, by the Indian Space Research Organisation
- GSLV-Mk III launcher, by the Indian Space Research Organisation