Indian techie helps NASA find Chandrayaan 2's Vikram lander on Moon
Washington: Chandrayaan-2's Vikram lander, which crashed on the surface of the Moon in September, has been found by NASA, the US space agency confirmed on Tuesday, lauding a Chennai-based techie who helped it trace the debris of India's ambitious lunar mission by spending hours comparing before and after images of the landing site.
NASA's confirmation came nearly three months after India's Chandrayaan-2 mission made a hard landing near the uncharted lunar south pole in the wee hours of September 7.
"The Chandrayaan2 Vikram lander has been found by our NASA Moon mission, the Lunar Reconnaissance Orbiter. See the first mosaic of the impact site," NASA said in a tweet sharing before and after impact images.
On September 7, the Indian Space Research Organisation (ISRO) attempted a soft landing of Vikram on the Moon. However, ISRO lost contact with Vikram shortly before the scheduled touchdown.
NASA's Lunar Reconnaissance Orbiter Camera (LROC) team had released the first mosaic of images acquired during its September 17 flyby of the Moon.
The US space agency released a mosaic image of the site on September 26 (but taken on September 17), inviting people to compare it with images of the same area before the crash to find signs of the lander.
The first person to come up with a positive identification was Chennai-based IT professional Shanmuga Subramanian, who confirmed the identification of the crashing site of Vikram by comparing before and after images.
"The debris first located by Shanmuga is about 750 metres northwest of the main crash site and was a single bright pixel identification in that first mosaic," NASA said.
After receiving this tip, the LROC team confirmed the identification by comparing the before and after images.
"When the images for the first mosaic were acquired the impact point was poorly illuminated and thus not easily identifiable," NASA said in a statement, adding that two subsequent image sequences were acquired on October 14 and 15, and November 11.
The LROC team scoured the surrounding area in these new mosaics and found the impact point about 2,500 feet to the southeast of the planned touchdown site, and a spray of debris emanating outward.
The November mosaic had the best pixel scale (0.7 metre) and lighting conditions (72 degrees incidence angle), NASA said.
"The November mosaic shows best the impact crater, ray and extensive debris field. The three largest pieces of debris are each about 2x2 pixels and cast a one pixel shadow," the statement said.
On October 3, Subramanian, a Chennai-based mechanical engineer, had tagged the twitter handles of NASA, LRO and ISRO in a tweet, asking, "Is this Vikram lander? (1 km from the landing spot) Lander might have been buried in Lunar sand?".
On November 17, he further zeroed in on his observations and tweeted out the possible crash site of the lander.
"This might be Vikram lander's crash site (Lat:-70.8552 Lon:21.71233 ) & the ejecta that was thrown out of it might have landed over here (The one on the left side was taken on July 16th & one on the right side was from Sept 17)," he said in a tweet accompanying the images.
As it turns out, Subramanian was spot on with his inferences, and now NASA has lauded him for finding the lander.
"NASA has credited me for finding Vikram Lander on Moon's surface VikramLander Chandrayaan2," Subramanian said in another tweet on Tuesday.
"Thank you for your email informing us of your discovery of debris from the Vikram lander. The LROC team confirmed that the location does exhibit changes in images taken before and after the date of the landing," said deputy project scientist Lunar Reconnaissance Orbiter mission John Keller.
"Using this information, the LROC team did additional searches in the area and located the site of the primary impact as well as other debris around the impact location and has announced the sighting on the NASA and ASU pages where you have been given credit for your observation," Keller said.
"I apologise for the delay in getting back to you. We needed to be certain of our interpretation of the observation as well as making sure that all stakeholders had an opportunity to comment before we could before we could announce the results. Congratulations for what i am sure was a lot of time and effort on your part," the scientist in his letter to Subramanian who shared it on Twitter.
Ever since ISRO lost contact with Vikram, NASA had made several attempts to locate the Chandrayaan-2 lander with the help of its Lunar Reconnaissance Orbiter.
The LRO flew over Vikram's landing site once on September 17 and next on October 14.
Chandrayaan-2 mission to the Moon launched in July. If the spacecraft had reached the surface in one piece on September 7, India would have been only the fourth country to successfully put a lander on the Moon.
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Prabhsimran fifty, Jitesh cameo lift Punjab Kings to 214/5 against SRH
Hyderabad, May 19: Prabhsimran Singh set the tone with a quickfire fifty before skipper Jitesh Sharma finished it off in style to lift Punjab Kings to an imposing 214/5 against Sunrisers Hyderabad in the IPL, here on Sunday.
The new look opening pair of Prabhsimran and Vidarbha's Atharva Taide put on 97 runs from 55 balls as PBKS did well to see through the power play without losing a wicket after opting to bat.
Prabhsimran smashed seven fours and four sixes for his 45-ball 71, while Taide will regret missing out on a fifty after being dismissed for a well-made 46 off just 27 balls.
Taide smashed five fours and two sixes and after his departure, Prabhsimran got the company of Rilee Rossouw as the duo put together 54 off 32 balls to keep the momentum going in the middle overs.
It looked a one-way traffic at 151/1 in 14 overs when leg-spinner Vijayakanth Viyaskanth dismissed the set batter Prabhsimran off a quicker delivery that took a faint edge and Heinrich Klaasen did well to take a one-handed catch behind the stumps.
Cummins (1/36) ended his spell taking the wicket Rossouw one run shy of a half-century in the 18th over that left two new batters at the crease -- Jitesh Sharma and Ashutosh Sharma.
T Natarajan (2/33) then did well to remove the inform Ashutosh Sharma in the penultimate over.
PBKS went on to lose four wickets for 44 runs in five overs before the stand-in skipper Jitesh's last over assault took them to a fighting total.
Jitesh (32 not out from 15 balls; 2x4, 2x6) finished with two sixes against Nitish Kumar Reddy in a 20-run final over.
It was a fearless batting display by the Punjab Kings who had nothing to lose and playing the last match of the season.
There was no Jonny Bairstow or Liam Livingstone -- the English duo who have left home for national duty -- but PBKS batters never felt their absence after they opted to bat.
Following a tidy start by Pat Cummins and Bhuvneshwar Kumar where the duo conceded just 12 runs, Prabhsimran took on the veteran Indian seamer slamming him for consecutive boundaries.
The lefthander Taide then got into the act in Natarajan's opening over, when he dragged one from outside off to through mid-on and followed it up with a mighty pull.
The diminutive Punjab batter Prabhsimran added to their misery, hammering a 145kph delivery from Cummins over deep square leg with sheer timing.
Taide also matched his senior partner Prabhsimran and took on Bhuvneshwar with a six and four, as PBKS cruised to 61 for no loss in the power play and the home side looked desperate in search of a breakthrough.
Natarajan finally broke the opening partnership in the 10th over with a short and widish delivery to dismiss a well set Taide.
But Prabhsimran continued his belligerent batting in the company of Rossouw and raced to a 34-ball fifty, his second this season in the 11th over.
His big assault came in Nitish Reddy's next over when the duo spanked him for 20 runs two sixes and one four as there was no stopping PBKS.
