Chandrayaan-2: Indian Helps Nasa To Find Moon Probe Debris

Chandrayaan-2: Indian Helps Nasa To Find Moon Probe Debris

Nasa says one of its satellites has found the debris of India’s Moon rover which crashed on the lunar surface in September.

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The space agency released a picture showing the site of the rover’s impact and the “associated debris field”.

Nasa has credited an Indian engineer, Shanmuga Subramanian, with helping locate the site of the debris.

Mr Subramanian examined a Nasa picture and located the first debris about 750m north-west of the crash site.

Chandrayaan-2 was due to touch down at the lunar South Pole on 7 September, 2019 over a month after it first took off.

It approached the Moon as normal until an error occurred about 2.1km (1.3 miles) from the surface, moments before it was to touch down.

The rover lost contact and had a “hard landing” about 600km (370 miles) from the South Pole in a “relatively ancient terrain”.

Announcing the discovery of the Vikram lander, Nasa tweeted a mosaic image of the site.

This image shows the Vikram Lander impact point and associated debris field. Green dots indicate spacecraft debris. Blue dots locate disturbed soil, likely where small bits of the spacecraft churned up the regolith. “S” indicates debris identified by Shanmuga Subramanian [Indian engineer], said the release from NASA, showing the spots on an image captured by its Lunar Reconnaissance Orbiter (LRO) on 11 November.

After 48 days in Earth and lunar orbit, the Vikram lander & Pragyan rover that had been indigenously developed were to soft-land on the lunar surface on 7 September.

A successful landing would have made India the fourth country to have landed on moon after the US, the erstwhile USSR and China. India would have made India the first country to have landed so close to the lunar South Pole, where scientists suspect there is water ice.

The velocity was reduced from 1,683m/s to 146 m/s. During the second phase of the descent, the reduction in velocity was more than the designed value. Due to this deviation, the initial conditions at the start of the fine braking phase were beyond the designed parameters. As a result, Vikram hard landed within 500m of the designated landing site.

Nasa’s orbiter had captured the first set of images of the landing site on 17 September, when it was lunar dusk in the region. Scientists from the LRO camera team had said that they were unable to identify the Vikram lander because of the long shadows in the region during dusk.

However, when these images were released to the public on 26 September, Subramaniam was one of the enthusiasts who downloaded the images and started a search for India’s lander.

Shanmuga Subramaniam is a mechanical engineer and an app developer from Chennai.

The Lunar Reconnaissance Orbiter Camera team released the first mosaic (acquired September 17) of the site on September 26 and many people have downloaded the mosaic to search for signs of Vikram.

Shanmuga Subramanian contacted the LRO project with a positive identification of debris. After receiving this tip, the LROC team confirmed the identification by comparing before and after images, read the statement from NASA.

To confirm, the team also went through the better lit images that the orbiter had acquired during its flyover on 14 October  & 11 November, 2019.

The LROC team scoured the surrounding area in these new mosaics and found the impact site (70.8810°S, 22.7840°E, 834 m elevation) and associated debris field, NASA said.

The debris first located by Shanmuga is about 750 meters northwest of the main crash site.

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