TheMoon Impact Probe (MIP) developed by theIndian Space Research Organisation (ISRO), India's national space agency, was alunar probe that was released by ISRO'sChandrayaan-1lunar remote sensing orbiter which in turn was launched, on 22 October 2008, aboard a modified version of ISRO'sPolar Satellite Launch Vehicle. It discovered the presence of water on the Moon.^[1][2]

The Moon Impact Probe separated from the Moon-orbiting Chandrayaan-1 on 14 November 2008, 14:36:54UTC and after nearly 25 minuteshard landed as planned, near the rim ofShackleton Crater.^[3][4][5] With this mission, ISRO became the fifthnational space agency to reach the lunar surface. Other nations whosenational space agencies to have done so prior were the formerSoviet Union in 1959,^[6] the United States in 1962,^[7][8] Japan in 1993,^[9] andESA member states in 2006.^[10][11][12]

The probe was a product of formerPresidentAbdul Kalam's suggestion^[13] who felt that since the Chandrayaan orbiter was already going so near to the Moon, the mission would have more scientific relevance if the probe was included. He believed that the Moon could not be left to a few countries and that India should not be left behind^[14]The Times of India also reported a political motive by former president Abdul Kalam as "He believed that if this was done, India could always stake a claim to a portion of the Moon."^[11] At the same time,The Indian Express reported Kalam as saying "no nation can claim the Moon as its own. The resources of the Moon should be a common property and that is one of the aims of the Moon mission."^[15]

The main objectives of the MIP were to demonstrate the technologies for reaching a specified location on the Moon, qualifying technologies required for any future soft landing missions, and scientific exploration of the Moon from close range just prior to the impact.^[16][17][18]

The MIP carried three instruments:^[19]

• Radar Altimeter – which measured the altitude of the probe during descent and provided information on qualifying technologies for future landing missions. The operating frequency band was 4.3GHz ± 100MHz.
• Video Imaging System – acquired close range images of the surface of the Moon during descent and before impact. The video imaging system consisted of ananalogCCD camera.
• Mass Spectrometer based payload CHACE – measured trace constituents of the lunar atmosphere during descent. This instrument was aquadrupole mass spectrometer with a mass resolution of 0.5amu and sensitivities to partial pressures on the order of 1.3×10⁻¹¹pascals.

The probe usedaluminium-honeycomb sandwich structure onto which the payloads were mounted. The probe was attached to the orbiter with a ball lock separation system which jettisoned the unit from the Chandrayaan. A solid propellant de-orbit mortar nudged the craft out of lunar orbit, while solid propellant based thrusters were fired tospin-stabilize the orientation enabling the imaging system to capture the descent profile.^[20]

The probe's external surface had four oval-shaped anodised aluminium plates measuring 120mm X 180mm^[21] on which the image of the Indian flag was depicted, complete with theEmblem of India and the words "Satyameva Jayate".^[21] These plates were attached to each one of the four vertical sides of the probe. As per ISRO specifications these plates had to endure a temperature range from −50 degreescelsius and as high as more than 150 degrees celsius.^[21]

India launched theChandrayaan-1 spacecraft using a modified version of thePSLV C11^[22][23] on 22 October 2008 fromSatish Dhawan Space Centre,Sriharikota,Andhra Pradesh at 06:22IST (00:52 UTC).^[24]

The lunar probe separated from Chandrayaaan-1, in a 102 km circular polar orbit around theMoon, at 20:06IST on 14 November 2008.^[25] After separation, it first fired its spin up rockets and then its retro rocket to de-orbit itself into the lunar surface.^[26] While descending, the MIP continuously sent information back to the Chandrayaan-1 orbiter which in turn beamed the information back to Earth. After a 25-minute descent, it struck the Moon at 20:31 IST, 14 November 2008 at a speed of 1.69 kilometers per second (approximately 6100 km/h or 3800 miles per hour).^[26] It crashed intoShackleton Crater, at the lunar south pole, near89°33′S122°56′W / 89.55°S 122.93°W /-89.55; -122.93,^[27][28] at 20:31 on 14 November 2008.^[25]

On 25 September 2009, ISRO announced that the MIP had discovered water on the Moon during its descent just before impact.^[1] This announcement was made after the discovery of water was announced on 24 September 2009 byScience magazine by the NASA payloadMoon Mineralogy Mapper carried on board Chandrayaan-1.^[29] MIP discovered water on the Moon before NASA's Moon Mineralogy Mapper, the announcement of this discovery was not made until NASA confirmed it.^[2][30]

The approximate impact location of the probe (89°46′S39°24′W / 89.76°S 39.40°W /-89.76; -39.40)^[31] was named asJawahar Sthal in India after thefirst Prime Minister of India, on whose birth anniversary^[32][33] incidentally the event of MIP impact took place. The name was suggested byA. P. J. Abdul Kalam to honor his vision that was crucial to the creation ofINCOSPAR and laterISRO.^[34][35]

The initial location was later refined to the Earth-facing slope of the connecting ridge betweenShackleton (crater) andDe Gerlache (crater) near coordinates (89°33′S122°56′W / 89.55°S 122.93°W /-89.55; -122.93) by matching images from MIP camera toLROC NAC image mosaic.^[36]

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