Chandrayaan-2

Chandrayaan-2
Name	Chandrayaan-2
Operator	Indian Space Research Organisation
Mission type	Lunar exploration
Launch date	2019-07-22
Launch vehicle	Geosynchronous Satellite Launch Vehicle Mark III
Launch site	Satish Dhawan Space Centre
Mission duration	Primary: 1 year (orbiter), extended
Orbit	Lunar polar orbit

Chandrayaan-2 was an Indian lunar exploration mission developed and operated by the Indian Space Research Organisation with objectives to perform high-resolution mapping of the Moon, demonstrate robotic soft landing, and deploy a lunar rover for in situ measurements. The mission consisted of an orbiter, a lander, and a rover, and built on earlier missions such as Chandrayaan-1 and international collaborations including data comparisons with Lunar Reconnaissance Orbiter and Lunar CRater Observation and Sensing Satellite. Its scientific goals aligned with studies by NASA, European Space Agency, Roscosmos, and institutions like Jet Propulsion Laboratory and SpaceX in comparative planetary science.

Background and Objectives

Development traced through milestones involving Vikram Sarabhai Space Centre, U R Rao Satellite Centre, and policy frameworks from Department of Space and leadership under figures from Indian National Congress-era scientific initiatives. Objectives emphasized remote sensing by synthetic aperture and imaging spectrometry instruments, surface composition studies tied to findings from Chandrayaan-1-era Moon Mineralogy Mapper comparisons, and volatile detection related to polar cold traps studied in Lunar Reconnaissance Orbiter datasets. The mission also sought technological demonstration of precision landing techniques researched at ISRO Satellite Centre and autonomy algorithms influenced by research at Indian Institute of Science, Indian Institute of Technology Kanpur, and Tata Institute of Fundamental Research.

Spacecraft and Payloads

The mission architecture combined an orbiter built at ISRO Satellite Centre, a lander developed at Vikram Sarabhai Space Centre, and a rover constructed with input from Physical Research Laboratory and academic partners such as IIT Madras and IISER Pune. Payloads included synthetic aperture radar and spectrometers analogous to instruments on Lunar Reconnaissance Orbiter and Kaguya (SELENE), as well as instruments comparable to Alpha Particle X-ray Spectrometer heritage from Mars Pathfinder and Curiosity (rover). Key payloads included imaging systems linked conceptually to Chandrayaan-1’s Moon Mineralogy Mapper, laser altimetry akin to MOLA, and radars comparable to Mini-RF. International payload collaboration concepts paralleled partnerships with NASA, CNES, DLR, and JAXA on other missions.

Mission Timeline

Launch occurred aboard Geosynchronous Satellite Launch Vehicle Mark III from Satish Dhawan Space Centre and followed Earth-bound maneuvers similar to transfer techniques used by ARTEMIS (NASA) missions before trans-lunar injection. The orbiter achieved lunar insertion and began mapping operations comparable in orbit strategy to Lunar Reconnaissance Orbiter and Kaguya (SELENE). The lander separation and descent phase paralleled descent profiles studied in Vikram (lander testing) and descent algorithms similar to those in Venera and Hayabusa2 missions. Timeline events included cruise, lunar orbit insertion, de-orbiting burn, and descent attempts analogous to stages executed by Chang'e 3 and Beresheet.

Scientific Findings and Results

Orbiter datasets produced high-resolution topography, mineralogical maps, and thermal inertia studies that complemented results from Chandrayaan-1, Lunar Reconnaissance Orbiter, and Kaguya (SELENE). Analyses addressed South Pole-Aitken Basin investigations and polar volatiles in context with detections by LCROSS and interpretations from Moon Mineralogy Mapper. Spectral evidence informed debates on hydroxyl and water molecule distribution initially raised by Chandrayaan-1 and followed up by SOFIA and Hubble Space Telescope observations. Gravity and geophysical measurements compared with models developed at Caltech and MIT and supported geological interpretations used in studies by National Aeronautics and Space Administration researchers. Data archives were integrated with planetary data systems used by USGS and International Astronomical Union working groups.

Challenges and Anomalies

The descent phase encountered anomalies during powered descent similar in operational analysis to experiences from Beresheet and lessons from Vikram (lander testing). Telemetry and real-time guidance issues prompted investigations drawing on expertise from Indian Space Research Organisation, academic teams at IISc Bangalore, and international consultants from Jet Propulsion Laboratory and European Space Agency engineers. Orbital insertion and instrument operations on the orbiter remained successful despite the lander anomaly, enabling continued science akin to recoveries by missions such as Mars Orbiter Mission which reused orbital assets after primary setbacks. Post-anomaly technical reviews considered control software, propulsion system performance, and sensor fusion strategies studied in Apollo and Soyuz program analyses.

Mission Legacy and Impact

The mission advanced capabilities at Indian Space Research Organisation comparable to milestones achieved by Roscosmos and JAXA in robotic exploration, influencing subsequent proposals with design input from ISRO engineers and partners at Indian Institutes of Technology and research centers such as PRL. Scientific legacy linked orbiter datasets to long-term lunar reconnaissance initiatives like Artemis and collaborative research facilitated by institutions including NASA, ESA, and CNES. Technological lessons informed future lander and rover development programs and stimulated growth in India's aerospace industry, echoing impacts seen after missions like Chandrayaan-1 and Mars Orbiter Mission. The mission also fostered public engagement through outreach by Indian Space Research Organisation and educational programs at ISRO centers and universities.

Category:Lunar exploration missions