Luna 25 lander mission, Russian lander following on from the Soviet-era lunar program |
Luna 25 lander mission, Russian lander following on from the Soviet-era lunar program |
Feb 4 2022, 03:14 AM
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Solar System Cartographer Group: Members Posts: 10180 Joined: 5-April 05 From: Canada Member No.: 227 |
I am starting a new thread for this mission which should fly this year.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Aug 20 2023, 06:25 PM
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Member Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Space is hard. Landings especially so.
I put this table together a few years ago for a paper on evaluating risk and payoff of planetary missions (in part to show the advantage of mobility, and of reconnaissance, to note that without at least the latter, a single, fixed Europa lander would be unlikely to realize the claims being made for it...) It shows that the empirical historical record for landings is something like 25-83% reliable (which is in stark contrast to the 99% reliability sought, and used in e.g. landing ellipse specification). I havent run the numbers, but I suspect the Chandrayaan2-Beresheet-Hakuto-Luna25 set of losses is consistent with the lower end of that. We'll see what happens later in the week.... The paper is at https://www.sciencedirect.com/science/artic...273117719303539 (may be paywalled, tho. email me if you need it and cant get it) |
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