For many of us, the soft-landing was the *most* critical part - something we were doing for the first time and by no means easy.
This is what I said on in July
Amber G. wrote:
SwamyG wrote:Amber and other gurus, which part of the entire journey from lift off to landing the rover would be cause for concerns & celebrations? From a mission perspective, that is.
For me the most critical part will be Vikram's soft landing on the moon. As there is no air, the inertial guidance based retro-rockets have to be extremely accurate. India has impressive and proven technology (used in MoM) here so I am quite hopeful.
Meanwhile as ISRO has pointed out, scientifically speaking, as output from the scientific equipments is concerned - I will agree with 98% success.
As far as Vikram - the site will be located/confirmed with more details in near future (few months). True, no details has been published publicly (not unusual at al), Images of Vikram has been captured by CY2 - and more will be captured - in thermal (IR), and visual range.
What we (scientists) all know and some of my thoughts -
==> Images and analysis of even a hard impact can and will provide many clues. For example, the debris around the actual vehicle can indicate the angle at which it fell as well as its speed. Clearer images can of course reveal what the status and position of the lander still is. It may take some time but questions would eventually be answered ...whether it is in one piece, whether it crashed at the spot it was supposed to or away from it, and whether it is in an inverted position or leaning slightly.. ityadi. It may take many passes of CY2/LRO , and many different wavelengths but that is what science and ISRO is all about.
==> I think (and most scientist will agree) most likely is that clear images will enable to see displacement of lunar soil (called regolith) at the crash site. ( Lunar regolith is a fine and powdery. When CY-1 intentionally crashed on the lunar surface around the same region a decade ago, it had displaced the regolith water ice under it - The biggest discovery of CY1)
==> Vikram would have displaced the regolith as well when it hit the surface. This would enable Chandrayaan-2’s orbiter to study the water ice using IIRS (Imaging Infrared Spectrometer) and DFSAR ( Dual Frequency Synthetic Aperture Radar) (As said above IIRS is an infrared imager that can perform a full mineralogical mapping of the moon. It’s purpose is to map water ice. The DFSAR will also perform lunar mapping in the process of measuring the thickness of the crust. It will calculate how thick the regolith is.
===> Scientists can also figure out what direction the antenna was pointing to and if the lander still was in one piece to be able to communicate again. (Unlikely because if it was, it would respond - I don't think it is in one piece - my estimation is minimum 50 m/s impact -- but who knows
Hope this is useful. IMO, this thread ought to focus more on CY2, science rather than pseudo science and off-topic silliness.