On Nov. 19, Mark S. Robinson opened an email with the subject line, Vikram Landers final resting place (Images with Proof).
Dr. Robinson is the principal investigator for the sharp-eyed camera aboard Lunar Reconnaissance Orbiter, a NASA spacecraft that has been mapping the moon for a decade, and he had received a lot of these emails since an Indian robotic spacecraft disappeared in September as it attempted to land on the moon.
But this one turned out to be the crucial clue in finding the missing lander, and on Monday NASA announced the location of the crash site, with photographs showing the scar on the moonscape.
The accomplishment was a triumph of crowdsourcing in modern space research, and pointed to the value of NASAs openness with its data and operations. Most of the data from American civilian space missions is freely available to both academics and curious amateurs, who were able to scour pictures from a NASA orbiter for signs of the Indian spacecraft.
By contrast, the Indian Space Research Organization, or ISRO, the agency that runs Indias space program, has been parsimonious in revealing what it knew about the fate of Vikram, which was part of Chandrayaan-2, a mission that launched in July. An accompanying orbiter continues to operate around the moon.
If Vikram had successfully made it to the surface, India would have become only the fourth nation to accomplish that feat. But as it descended, something went awry about a mile above the surface. Vikram shifted off course, then went quiet.
A day later, the Indian space agency posted on its website that it had already found the lander: Vikram lander has been located by the orbiter of Chandrayaan-2, but no communication with it yet.
This week, K. Sivan, ISROs director, dismissed the NASA announcement, repeating the claim that Vikrams location had been identified back in September.
However, the Indian space agency never released images or other data to corroborate the statement, nor did it share the coordinates of where Vikram supposedly sat on the moons surface. Only last month did the Indian government admit failure.
Thus, NASA and others looked for Vikram without ISROs help.
The Lunar Reconnaissance Orbiter, which has been methodically mapping the lunar surface for a decade, happened to pass over the Vikram landing site 10 days after its crash.
Dr. Robinson and other camera scientists examined the images, but there were no obvious signs of Vikram. The high-resolution images encompassed about a billion pixels, and the small lander, if it were not hidden in the shadows, would be only a few pixels wide.
There was a huge search area, said Dr. Robinson, a professor of earth and space exploration at Arizona State University. There were five or six people who pitched in and spent a day.
They then returned to their more scientific tasks. It was interesting to do, Dr. Robinson said. There wasnt a lot of scientific value in it.
The orbiter made additional flyovers of the site on Oct. 14, Oct. 15 and Nov. 11, adding more pictures to analyze. The direction the spacecraft was pointing during the Nov. 11 flyover provided better lighting and sharper resolution in the images.
Amateur enthusiasts continued to examine the NASA images, and many claims of Vikram sightings landed in Dr. Robinsons inbox. For most, a quick before-and-after comparison with older photographs showed that the purported impact crater was already a feature of the lunar surface.
While NASAs openness has enabled many more eyes to look over the scientific data, the space agency, with management of its missions spread around the country, is not always diligent in following up on tips.
The November email came from Shanmuga Subramanian, a computer programmer and mechanical engineer living in the south Indian city of Chennai, who had already tried for a month to tell NASA what he thought he had found.
On Oct. 3, Mr. Shanmuga posted on Twitter a tiny white speck that was not visible in an older image, which he said he thought could be Vikram.
Two weeks later, he emailed Noah E. Petro, the project scientist for the Lunar Reconnaissance Orbiter. Five days later he followed up with Dr. Petro and John W. Keller, the deputy project scientist.
But it was only on the third email that he added Dr. Robinson, who forwarded the email to other scientists on the camera team, and they quickly found the crash site.
First, they confirmed that the speck Mr. Shanmuga identified was not there before September but was also visible in the October and November flybys. That ruled out the possibility that the speck was unlucky camera noise.
They then found changes in the brightness of nearby soil caused by bits of the moon flying upward and outward after the impact.
The pattern looked like a splash of water and pointed to where Vikram had slammed into the moon, about 2,500 feet to the southeast of the speck Mr. Shanmuga had seen. The speck turned out to be a piece of Vikram thrown out by the impact, and the scientists spotted other bits of wreckage.
The debris is spread out over a wide area, Dr. Robinson said.
While Indian authorities had initially suggested that the spacecraft could still be operational after a harder-than-designed landing, the images showed Vikram had disintegrated.
It wasnt a hard landing, Dr. Robinson said. It was a crash.
Dr. Robinson said it took a few days to carefully check the analysis before he informed Dr. Petro and Dr. Keller, who in turn told agency officials before Thanksgiving.
A NASA spokesman said that the release of the findings was coordinated with the Indian space agency. But the spokesman said ISRO did not share with NASA the coordinates of where it thought Vikram had ended up.
ISRO did not respond to questions about the claim that the Chandrayaan-2 orbiter had already located the lander in September.
Vikrams inadvertent strike of the moon reveals properties of the soil in the area that scientists would not have seen otherwise.
At the impact point, the surface became darker.
That material is not itself necessarily darker, but rather chunkier and thus casting more shadows, making it appear darker.
That tells something about the cratering mechanics, Dr. Robinson said.
Farther away, lighter-colored material emanates outward. The lighter streaks are not a coating of material thrown out by the impact but rather, the surface was smoothed out, making it more reflective and brighter, Dr. Robinson said. Seeing that could aid future studies of the moons surface.
_____
Hari Kumar contributed reporting from New Delhi.
Read the rest here:
A Billion Pixels and the Search for Indias Crashed Moon Lander - The New York Times
- 2D Laser Profiling Scanner for Detecting Targets - November 8th, 2009 [November 8th, 2009]
- NASA Energy Concept Could Harness the Power of Ocean Waves - November 8th, 2009 [November 8th, 2009]
- Data Acquisition Modules - November 8th, 2009 [November 8th, 2009]
- Dr. Scott Barthelmy, Research Scientist, Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, MD - November 8th, 2009 [November 8th, 2009]
- Laser Tracker Ensures Accurate Alignment of Ares I Components - November 8th, 2009 [November 8th, 2009]
- Dual Cryogenic Capacitive Density Sensor - November 8th, 2009 [November 8th, 2009]
- Advanced Technologies Will Help Hubble Yield More Remarkable Discoveries - November 8th, 2009 [November 8th, 2009]
- Dr. Gerard Holzmann, Senior Research Scientist at the Laboratory for Reliable Software, NASA’s Jet Propulsion Laboratory - November 8th, 2009 [November 8th, 2009]
- NASA Research Will Help Aircraft Avoid Ocean Storms and Turbulence - November 8th, 2009 [November 8th, 2009]
- NASA Awards 2008 Software of the Year - November 8th, 2009 [November 8th, 2009]
- Here Come The Tricorders - Update - November 8th, 2009 [November 8th, 2009]
- China's View on Space - November 8th, 2009 [November 8th, 2009]
- Milsat Coordination and Tracking Issues - November 8th, 2009 [November 8th, 2009]
- Trash Talking and End Runs at NASA HQ - November 8th, 2009 [November 8th, 2009]
- Ares 1-Y is Toast - November 8th, 2009 [November 8th, 2009]
- Beyond Augustine - November 8th, 2009 [November 8th, 2009]
- Analyzing LCROSS' Plume - November 8th, 2009 [November 8th, 2009]
- Live Event: NASA-Sponsored Power Beaming Challenge - November 8th, 2009 [November 8th, 2009]
- JSC Wants To Build a Replicator - November 8th, 2009 [November 8th, 2009]
- USA: Looking For Ways To Hang On - November 8th, 2009 [November 8th, 2009]
- Lunar Lander Challenge Prizes Awarded - November 8th, 2009 [November 8th, 2009]
- Senate Votes To Restore NASA Budget Cuts - November 8th, 2009 [November 8th, 2009]
- New FAA Regs for Commercial Reentry - November 8th, 2009 [November 8th, 2009]
- TEDxNASA: An Invitation-Only NASA Meeting - Unless You Are Lucky - November 8th, 2009 [November 8th, 2009]
- Close Call For Courtney Stadd - November 8th, 2009 [November 8th, 2009]
- Space: A Waste? - November 8th, 2009 [November 8th, 2009]
- Making NASA Cool - November 8th, 2009 [November 8th, 2009]
- Engaging JSC’s Next Gen: A Leadership Analysis - November 8th, 2009 [November 8th, 2009]
- Dumpster Diving for Rockets - November 8th, 2009 [November 8th, 2009]
- TEDx NASA - November 8th, 2009 [November 8th, 2009]
- Reflections On a Business Trip in Huntsville - November 8th, 2009 [November 8th, 2009]
- Staying the Course - November 8th, 2009 [November 8th, 2009]
- The Economics of Space - November 8th, 2009 [November 8th, 2009]
- Ideas at Work - November 8th, 2009 [November 8th, 2009]
- Blah Blah Blah - Why We Should Care About Social Media - November 8th, 2009 [November 8th, 2009]
- Will White House Speak Soon About NASA? - December 12th, 2009 [December 12th, 2009]
- Software Aids Design of Ares V Composite Shroud Structure - December 13th, 2009 [December 13th, 2009]
- ASDX Series of silicon pressure sensors - December 13th, 2009 [December 13th, 2009]
- Industry Update: Analysis & Simulation Software - December 13th, 2009 [December 13th, 2009]
- Battery Will Provide Backup Power for Space Shuttles - December 13th, 2009 [December 13th, 2009]
- NASA Employee Claims To Have Witnessed Hijacking Planning - December 13th, 2009 [December 13th, 2009]
- Big Party in The Mojave Tonight - December 13th, 2009 [December 13th, 2009]
- Looking at Boulders on the Moon - December 13th, 2009 [December 13th, 2009]
- SpaceBook Featured by White House - December 13th, 2009 [December 13th, 2009]
- New Ways to Use Constellation Stuff - December 13th, 2009 [December 13th, 2009]
- LaRC internal Poll Update - December 13th, 2009 [December 13th, 2009]
- Coalition for Space Exploration Does a (Much Needed) Reboot - December 13th, 2009 [December 13th, 2009]
- Lunar Orbiter: Comparing Old and New Images - December 13th, 2009 [December 13th, 2009]
- Boulder Trails On The Moon - December 13th, 2009 [December 13th, 2009]
- Vote for John Grunsfeld - National Geographic Adventurer of the YeAR - December 13th, 2009 [December 13th, 2009]
- Charlie Bolden at WIA/AIAA - December 13th, 2009 [December 13th, 2009]
- Live Webcast From The Lunar Orbiter Image Recovery Project - December 13th, 2009 [December 13th, 2009]
- Big Aerospace Warns of Job Cut Impact - December 13th, 2009 [December 13th, 2009]
- The Boulders of Copernicus - December 13th, 2009 [December 13th, 2009]
- shame on us - December 13th, 2009 [December 13th, 2009]
- 2009 Space Elevator Games - December 13th, 2009 [December 13th, 2009]
- Random Hacks of Kindness - December 13th, 2009 [December 13th, 2009]
- TEDx NASA Tickets Available to the Public - December 13th, 2009 [December 13th, 2009]
- It’s better in person - December 13th, 2009 [December 13th, 2009]
- Leading Amidst the Disruptive Innovation Storm - December 13th, 2009 [December 13th, 2009]
- Space: What’s NOT to Hope for? - December 13th, 2009 [December 13th, 2009]
- Government in the Digital Age - December 13th, 2009 [December 13th, 2009]
- SpaceUp – A Space Unconference - December 13th, 2009 [December 13th, 2009]
- Starfleet Academy? - December 13th, 2009 [December 13th, 2009]
- Crowdsourcing NASA - December 13th, 2009 [December 13th, 2009]
- Bringing Home The Bacon - December 14th, 2009 [December 14th, 2009]
- Anti-Space Mom with Pro-Space Kids - December 14th, 2009 [December 14th, 2009]
- How Quickly We Forget - December 14th, 2009 [December 14th, 2009]
- WISE Launch A Success - December 14th, 2009 [December 14th, 2009]
- Dynetics Buys Orion Propulsion - December 15th, 2009 [December 15th, 2009]
- New NASA Governance Structure Under Development - December 16th, 2009 [December 16th, 2009]
- Bolden Meets With Obama on Wednesday - December 16th, 2009 [December 16th, 2009]
- MSFC Procurement Doesn't Understand what "Open Source" Means - December 16th, 2009 [December 16th, 2009]
- Bolden Meets With Obama - December 17th, 2009 [December 17th, 2009]
- Parker Griffith AT MSFC Today - December 18th, 2009 [December 18th, 2009]
- Why Your NASA Computer May Not Work Properly - December 18th, 2009 [December 18th, 2009]
- Lakes and Fog on Titan - December 18th, 2009 [December 18th, 2009]
- Waterworld Found - December 18th, 2009 [December 18th, 2009]
- Pandora Could Exist - December 18th, 2009 [December 18th, 2009]
- Laurie Leshin Is The New ESMD Deputy AA - December 18th, 2009 [December 18th, 2009]