Dawn approaches Ceres, From opnav images to first orbit |
Dawn approaches Ceres, From opnav images to first orbit |
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#601
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10196 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
On Tuesday (two days from now, for visitors from the future), the first optical navigation image will be taken... hopefully we'll have it in our hands soon after that. So it's time for a new topic. Over the next few months we'll have progressively closer images and full orbit characterization sequences, no doubt including multispectral image sets.
A new world... This is a bit of reprocessing I have been doing with the Hubble images from a few years ago. 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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#602
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 ![]() |
Great first step in analysing the light curves!
Slope of the light curves may be correlated to albedo. To separate slope and albedo of the terrain properly, I guess two or three parameters of the light curve need to be inferred. I can't yet predict how successful this will be, but I'm intending to work on it the next days. Nice to see others working on the analysis, too! ![]() |
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#603
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![]() Member ![]() ![]() ![]() Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 ![]() |
Great first step in analysing the light curves! Slope of the light curves may be correlated to albedo. To separate slope and albedo of the terrain properly, I guess two or three parameters of the light curve need to be inferred. I can't yet predict how successful this will be, but I'm intending to work on it the next days. Nice to see others working on the analysis, too! ![]() I am impressed with the registration of the images in the animation. good work! You can use the light curve to estimate the X component of the surface normal direction. (A good brdf model would help here) But you have no per pixel info on the Y component so getting an albedo value is not fully constrained. But if you assume that the local albedo between local pixel lines is constant you can estimate the Y component of the normal vector. From there it is possible to get a resonable good estimate of albedo. Fun stuff. |
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Lo-Fi Version | Time is now: 23rd June 2024 - 09:44 AM |
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