NASA pictures debunk ISRO’s hard landing claim
NASA has released a set of images showing the Vikram Lander impact point and associated debris field attempting to convey, more or less conclusively, that the Chandrayaan-2 mission had ended in a fiasco as the Moon lander, instead of achieving the softlanding target, had crashed, disintegrated and blown up into pieces.
At another level, question remains, what was the basis or evidence to back the hard landing claim and assertion by ISRO that efforts were on to build contact immediately after all communication had been lost with the Moon lander on 7 September 2019.
Green dots in the photo released by NASA indicate spacecraft debris (confirmed or likely). The NASA statement says blue dots locate disturbed soil, likely where small bits of the spacecraft churned up the regolith. “S” indicates debris identified by Shanmuga Subramanian (a Chennai based techy). This portion of the Narrow Angle Camera mosaic was made from images M1328074531L/R and M1328081572L/R acquired Nov. 11.
Credits: NASA/Goddard/Arizona State University.
NASA has said that Chandrayaan 2 Vikram lander was targeted for a highland smooth plain about 600 kilometers from the south pole; unfortunately the Indian Space Research Organisation (ISRO) lost contact with their lander shortly before the scheduled touchdown (Sept. 7 in India, Sept. 6 in the United States). Despite the loss, getting that close to the surface was an amazing achievement, NASA statement says adding the Lunar Reconnaissance Orbiter Camera team released the first mosaic (acquired Sept. 17) of the site on Sept. 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. When the images for the first mosaic were acquired the impact point was poorly illuminated and thus not easily identifiable. Two subsequent image sequences were acquired on Oct. 14 and 15, and Nov. 11. 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. The November mosaic had the best pixel scale (0.7 meter) and lighting conditions (72° incidence angle).
The debris first located by Shanmuga is about 750 meters northwest of the main crash site and was a single bright pixel identification in that first mosaic (1.3 meter pixels, 84° incidence angle). The November mosaic shows best the impact crater, ray and extensive debris field. The three largest pieces of debris are each about 2×2 pixels and cast a one pixel shadow.