Future Venus Missions |
Future Venus Missions |
Jul 1 2005, 01:30 AM
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#201
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Solar System Cartographer Group: Members Posts: 10186 Joined: 5-April 05 From: Canada Member No.: 227 |
Oh well, might as well start that new topic since it's already well advanced in the Juno area...
My perspective on landers is as follows. All the landers we've had so far were dropped blind onto an essentially unknown surface. Any future landers can be targeted for specific terrains. It really is not true that we have had representative landings. Even a descent image or two, a panoramic photo plus a bit of surface composition, from a simple Venera-class lander just updated a bit, would be useful if we could put several down at well chosen targets. My choices would be: Examples of the main plains units (smooth, fractured, ridged) tesserae high elevation radar-bright tesserae large fresh lava flow unit ('fluctus') crater dark parabola crater ejecta outflow unit dunes area. And I have always assumed, rightly or wrongly, that it would be relatively easy to put these down, so they ought to be fairly inexpensive as planetary landers go. 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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Jun 3 2021, 08:03 AM
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#202
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
That's excellent. Lets hope against hope for at least 30 minutes then.
Maybe a shot or two from the surface a la Huygens? P |
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Jun 3 2021, 02:30 PM
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#203
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Member Group: Members Posts: 706 Joined: 22-April 05 Member No.: 351 |
That's excellent. Lets hope against hope for at least 30 minutes then. Maybe a shot or two from the surface a la Huygens? D+'s camera points down. So if the probe survives landing, there will be pictures of the camera pressed against the surface. -------------------- |
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Jun 3 2021, 03:02 PM
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#204
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Member Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
D+'s camera points down. So if the probe survives landing, there will be pictures of the camera pressed against the surface. Of the 4 Pioneer Venus probes, which had a similar design posture to impact survival (as did Huygens), signals from 2 were lost immediately at impact, signals from one for a second or two (consistent, perhaps with toppling over and pointing the antenna away from Earth) without any real science content, and signals from one were received for an hour, showing some variation in light levels. So the empirical odds are about 25% that we get something from the surface. I suppose the ideal for DAVINCI would be to topple over in such a way that the camera points at the horizon, and the antenna happens to point at the right azimuth to maintain the data relay. Whether the camera lens is scratched up or dusty is another story. We'll at least be running the accelerometers to see if the microseisms indicated by Venera are seen, those measurements don't require any orientation except for radio link But this would all be gravy, the descent imaging should be spectacular. |
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