Chandrayaan-3

Chandrayaan-3

Chandrayaan-3 Integrated Module in cleanroom before encapsulation
Mission type	Lander Rover
Operator	ISRO
COSPAR ID	{{#property:P247}}
Website	www.isro.gov.in/Chandrayaan3.html
Mission duration	1 year, 11 months and 4 days (elapsed) Propulsion module: ≤ 3 to 6 months (planned) 1 year, 10 months and 13 days (elapsed) (since orbit insertion) Vikram lander: ≤ 1 year, 9 months and 25 days (elapsed) (since landing) Pragyan rover: ≤ 14 days (planned)
Spacecraft properties
Bus	Chandrayaan
Manufacturer	ISRO
Launch mass	3900 kg
Payload mass	Propulsion Module: 2148 kg Lander Module (Vikram): 1726 kg Rover (Pragyan) 26 kg Total: 3900 kg
Power	Propulsion Module: 758 W Lander Module: 738 W WS with Bias Rover: 50 W
Start of mission
Launch date	14 July 2023 (2023-07-14) 14:35:17 IST, (9:05:17 UTC)
Rocket	LVM3 M4
Launch site	Satish Dhawan Space Centre
Contractor	ISRO
Moon orbiter
Orbital insertion	5 August 2023
Orbital parameters
Pericynthion altitude	153 km (95 mi)
Apocynthion altitude	163 km (101 mi)
Moon lander
Spacecraft component	Vikram lander
Landing date	23 August 2023 (2023-08-23) 18:02 IST, (12:32 UTC)
Landing site	69.367621°S 32.348126°E / -69.367621; 32.348126 (between Manzinus C and Simpelius N craters)
Moon rover
Spacecraft component	Pragyan rover
Landing date	TBD
Chandrayaan programme

Chandrayaan-3 (transl. Moon-craft, pronunciation ) is the third Indian lunar exploration mission under the Indian Space Research Organisation's (ISRO) Chandrayaan programme. It consists of a lander named Vikram and a rover named Pragyan, similar to those of the Chandrayaan-2 mission. The propulsion module carried the lander and rover configuration to lunar orbit in preparation for a powered descent by the lander.

Chandrayaan-3 was launched on 14 July 2023. The lander and rover landed near the lunar south pole region on 23 August 2023 at 18:02 IST, making India the first country to successfully land a spacecraft near the lunar south pole and the fourth country to soft-land on the Moon.

Background

Further information: Chandrayaan programme

On 22 July 2019, ISRO launched Chandrayaan-2 on board a Launch Vehicle Mark-3 (LVM3) launch vehicle consisting of an orbiter, a lander and a rover. The lander was scheduled to touch down on the lunar surface in September 2019 to deploy the Pragyan rover. The lander ultimately crashed when it deviated from its intended trajectory while attempting to land.

Following Chandrayaan-2, Chandrayaan-3 and further lunar missions were proposed.

The European Space Tracking network (ESTRACK), operated by the European Space Agency (ESA), is supporting the mission. Under a new cross-support arrangement, ESA tracking support could be provided for upcoming ISRO missions such as those of India's first human spaceflight programme, Gaganyaan, and the Aditya-L1 solar research mission. In return, future ESA missions will receive similar support from ISRO's own tracking stations.

Objectives

ISRO's mission objectives for the Chandrayaan-3 mission were:

1. Getting a lander to land safely and softly on the surface of the Moon.
2. Observing and demonstrating the rover's driving capabilities on the Moon.
3. Conducting and observing experiments on the materials available on the lunar surface to better understand the composition of the Moon.

Spacecraft

Design

Chandrayaan-3 comprised three main components:

Propulsion module

The propulsion module carries the lander and rover configuration to a 100 kilometres (62 mi) lunar orbit. It is a box-like structure with a large solar panel mounted on one side and a cylindrical mounting structure for the lander (the Intermodular Adapter Cone) on top.

Lander

The Vikram lander is responsible for the soft landing on the Moon. It is also box-shaped, with four landing legs and four landing thrusters capable of producing 800 newtons of thrust each. It carries the rover and various scientific instruments to perform on-site analysis.

The lander for Chandrayaan-3 has four variable-thrust engines with slew rate changing capabilities, unlike Chandrayaan-2's lander, which had five, with the fifth one being centrally mounted and capable only of fixed thrust. One of the main reasons for Chandrayaan-2 landing failure, attitude increase during the camera coasting phase, was removed by allowing the lander to control attitude and thrust during all phases of descent. Attitude correction rate is increased from Chandrayaan-2's 10°/s to 25°/s with Chandrayaan-3. Additionally, the Chandrayaan-3 lander will be equipped with a Laser Doppler Velocimeter (LDV) to allow measuring attitude in 3 directions. The impact legs have been made stronger compared to Chandrayaan-2 and instrumentation redundancy has been improved. It will target a more precise 4 km (2.5 mi) by 4 km (2.5 mi) landing region based on images previously provided by the Orbiter High-Resolution Camera (OHRC) onboard Chandrayaan-2's orbiter. ISRO improved the structural rigidity, increased polling in instruments, increased data frequency and transmission, and added additional multiple contingency systems to improve lander survivability in the event of failures during descent and landing.

Rover

The Pragyan rover is a six-wheeled vehicle with a mass of 26 kilograms (57 pounds). It is 917 millimetres (3.009 ft) x 750 millimetres (2.46 ft) x 397 millimetres (1.302 ft) in size.

The rover is expected to take multiple measurements to support research into the composition of the lunar surface, the presence of water ice in the lunar soil, the history of lunar impacts, and the evolution of the Moon's atmosphere.

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  Integrated module

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  Propulsion module

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  Lander

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  Pragyan rover

Payloads

Lander

• Chandra's Surface Thermophysical Experiment (ChaSTE) will measure the thermal conductivity and temperature of the lunar surface.
• Instrument for Lunar Seismic Activity (ILSA) will measure the seismicity around the landing site.
• Langmuir Probe (LP) will estimate the near-surface plasma density over time.

Rover

• Alpha Particle X-Ray Spectrometer (APXS) will derive the chemical composition and infer the mineralogical composition of the lunar surface.
• Laser-Induced Breakdown Spectroscope (LIBS) will determine the elemental composition (Mg, Al, Si, K, Ca, Ti, Fe) of lunar soil and rocks around the lunar landing site.

Propulsion module

• Spectro-polarimetry of Habitable Planet Earth (SHAPE) will study spectral and polarimetric measurements of Earth from the lunar orbit in the near-infrared (NIR) wavelength range (1–1.7 μm [3.9×10⁻⁵–6.7×10⁻⁵ in]).

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  Alpha Particle X-Ray Spectrometer (APSX)

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  Chandra's Surface Thermophysical Experiment (ChaSTE)

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  Instrument for Lunar Seismic Activity (ILSA)

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  Laser-Induced Breakdown Spectroscope (LIBS)

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  Langmuir Probe (RAMBHA-LP)

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  Spectro-polarimetry of Habitable Planet Earth (SHAPE)

Mission profile

Animation of Chandrayaan-3

Around the Earth – Orbit raising phase

Around the Earth

Around the Moon

   Chandrayaan-3's Path ·    Earth ·    Moon

Launch

LVM3 M4, Chandrayaan-3 – Launch vehicle lifting off from the second launch pad of SDSC-SHAR, Sriharikota

Chandrayaan-3 was launched aboard an LVM3-M4 rocket on 14 July 2023, at 2:35 pm IST from Satish Dhawan Space Centre Second Launch Pad in Sriharikota, Andhra Pradesh, India, entering an Earth parking orbit with a perigee of 170 km (106 mi) and an apogee of 36,500 km (22,680 mi).

Orbit

After a series of manoeuvres that placed Chandrayaan-3 in a trans-lunar injection orbit, ISRO performed a lunar-orbit insertion (LOI) on 5 August, successfully placing the Chandrayaan-3 spacecraft into orbit around the Moon. The LOI operation was carried out from the ISRO Telemetry, Tracking, and Command Network (ISTRAC) located in Bengaluru.

On 17 August, the Vikram lander separated from the propulsion module to begin the last phase of the mission.

Descent

On 23 August 2023, as the lander approached the low point of its orbit, its four engines fired as a braking manoeuvre at 30 kilometres (19 mi) above the Moon's surface. After 11.5 minutes, the lander was 7.2 km (4.5 miles) above the surface; it maintained its altitude for about 10 seconds, then stabilized itself using eight smaller thrusters and rotated from a horizontal to a vertical position while continuing its descent.

It then used two of its four engines to slow its descent to roughly 150 metres (490 ft); it hovered there for about 30 seconds before continuing downward and touching down at 12:32 UTC.

Stages of Chandrayaan-3 deployment and flight

Stage and sequence	Date/ Time (UTC)	LAM burn time	Orbit	Orbital period	References
Earth orbit: Launch	13 July 2023	N/A	170 km × 36,500 km (110 mi × 22,680 mi)	N/A
Earth bound maneuvers: 1	15 July 2023	N/A	173 km × 41,762 km (107 mi × 25,950 mi)	N/A
Earth bound maneuvers: 2	17 July 2023	N/A	226 km × 41,603 km (140 mi × 25,851 mi)	N/A
Earth bound maneuvers: 3	18 July 2023	N/A	228 km × 51,400 km (142 mi × 31,938 mi)	N/A
Earth bound maneuvers: 4	20 July 2023	N/A	233 km × 71,351 km (145 mi × 44,335 mi)	N/A
Earth bound maneuvers: 5	25 July 2023	N/A	236 km × 127,603 km (147 mi × 79,289 mi)	N/A
Translunar injection	31 July 2023	N/A	288 km × 369,328 km (179 mi × 229,490 mi)	N/A
Lunar orbit injection	5 August 2023	1,835 sec	164 km × 18,074 km (102 mi × 11,231 mi)	Approx. 21 h (1,300 min)
Lunar bound maneuvers: 2	6 August 2023	N/A	170 km × 4,313 km (106 mi × 2,680 mi)	N/A
Lunar bound maneuvers:3	9 August 2023	N/A	174 km × 1,437 km (108 mi × 893 mi)	N/A
Lunar bound maneuvers:4	14 August 2023	N/A	150 km × 177 km (93 mi × 110 mi)	N/A
Lunar bound maneuvers:5	16 August 2023	N/A	153 km × 163 km (95 mi × 101 mi)	N/A
Lander deorbit maneuvers: 1	18 August 2023	N/A	113 km × 157 km (70 mi × 98 mi)	N/A
Lander deorbit maneuvers: 2	19 August 2023	60 sec	25 km × 134 km (16 mi × 83 mi)	N/A
Landing: 1	23 August 2023	TBC	N/A	N/A
Rover deployment: 1	23 August 2023	N/A	N/A	N/A

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  Moon as captured by the Lander Position Detection Camera (LPDC) aboard Chandrayaan-3 lander on 15 August 2023

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  View from the Lander Imager Camera-1 (LI-1) on 17 August 2023 just after the separation of the Chandrayaan-3 Lander Module from the Propulsion Module

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  Chandrayaan-3 orbital manoeuvre

Mission life

• Propulsion Module: Carries lander and rover to 100 by 100 kilometres (62 mi × 62 mi) orbit, with operation of experimental payload for up to 6 months.
• Lander Module: 1 Lunar Day (14 Earth Days)
• Rover Module: 1 Lunar Day (14 Earth Days)

Team

• ISRO Chairperson: S. Somanath
• Mission Director: S. Mohanakumar
• Associate Mission Director: G. Narayanan
• Project Director: P. Veeramuthuvel
• Deputy Project Director: Kalpana. K
• Vehicle Director: Biju C. Thomas

Funding

In December 2019, ISRO requested the initial funding of the project, amounting to ₹75 crore (US$8.6 million), out of which ₹60 crore (US$6.9 million) would be for meeting expenditure towards machinery, equipment, and other capital expenditure, while the remaining ₹15 crore (US$1.7 million) was sought for operating expenditure.

Confirming the existence of the project, ISRO's former chairman K. Sivan stated that the estimated cost would be around ₹615 crore (US$71 million).

See also

• Indian Human Spaceflight Programme
• Indian Martian Exploration Programme
• Venus Orbiter Mission – Indian Venus mission
• Aditya-L1 – Indian solar observation mission
• Gaganyaan – Indian crewed spacecraft project