Mars Express - Game Changer, Must-watch seminar |
Mars Express - Game Changer, Must-watch seminar |
Aug 20 2020, 09:29 PM
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#1
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Member Group: Members Posts: 109 Joined: 25-November 04 From: Dublin, Ireland Member No.: 113 |
Today's ISSI seminar with Ralf Jaumann (HRSC PI) is an absolute must-see for members of this forum. Superb citations throughout, and older hands will smile at the methane discussion after the talk
(There is a global atmospheric image at approx 50 mins. on the recording, from orbit 16472, where Ralf discusses a possible sighting of a defunct orbiter. Is this new?) Mars Express with Ralf Jaumann |
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Aug 22 2020, 01:47 PM
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#2
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Member Group: Members Posts: 291 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
Yes, and about 53.5 minutes they violate forum rule 1.3!
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Aug 24 2020, 12:21 AM
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#3
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
They can do that; it's not their rule. But discussions here have to follow 1.3.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Aug 24 2020, 08:59 AM
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#4
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Junior Member Group: Members Posts: 43 Joined: 14-December 12 Member No.: 6784 |
Very interesting.
Would the range estimate be derived from parallax, i.e. was it viewed in multiple images? Does the orbiter candidate align with the image pixel grid? Given the blocky/rectangular appearance and unfamiliar geometry I have a hard time understanding how this could be a physical object. |
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Aug 24 2020, 08:22 PM
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#5
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Solar System Cartographer Group: Members Posts: 10251 Joined: 5-April 05 From: Canada Member No.: 227 |
The blocky appearance is just the original pixels of the image, or to be more precise, it shows which pixels contain part of the object. We don't know how the histogram has been displayed. HRSC takes several images in one sequence to provide stereo and spectral data, so possibly the object is in multiple images. However, only one image in the sequence will be at the maximum resolution (presumably that must be the one we see here), so all the rest will probably just place one or two pixels on the object. From that there might be enough parallax to get the range, and from that the size of the object.
It would be interesting if they can get the location and size pinned down well enough to identify the orbiter, but the older an orbiter is the less we will know about its orbit after decades of evolution under the influence of the planet, Phobos, Jupiter and the Sun. 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 PDF: 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 25 2020, 08:12 AM
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#6
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Member Group: Members Posts: 256 Joined: 28-October 12 Member No.: 6732 |
The image sequence in question was taken on 1 January 2017. The only sequence taken during this day. Apparently, the speck of pixels appears only in the near-infrared channel (955 nm).
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