Future Venus Missions |
Future Venus Missions |
Jul 1 2005, 01:30 AM
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#301
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Solar System Cartographer Group: Members Posts: 10226 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 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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May 23 2022, 07:17 PM
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#302
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
DAVINCI uses a sapphire camera window to handle the intense heat and pressure, according to this site the Venera camera windows were quartz. one wonders if saphire was chosen because the thermal expansion characteristics might perhaps be more favorable across expected deep space vs surface conditions?
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May 23 2022, 08:04 PM
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#303
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Junior Member Group: Members Posts: 27 Joined: 26-August 13 Member No.: 6994 |
DAVINCI uses a sapphire camera window to handle the intense heat and pressure, according to this site the Venera camera windows were quartz. one wonders if saphire was chosen because the thermal expansion characteristics might perhaps be more favorable across expected deep space vs surface conditions? Could be window transmission. Sapphire is pretty transparent over 0.14-6 microns vs quartz 0.17-3.5 (give or take a bit, depending on window thickness). |
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Sep 4 2022, 11:03 PM
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#304
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Member Group: Members Posts: 251 Joined: 14-January 22 Member No.: 9140 |
China has a proposed Venus mission which, given the brief description given here, seems like it would overlap in goals with Veritas and Envision, and if selected, would arrive at about the same time as Veritas. The orbit would be somewhat higher so perhaps the radar resolution would not be quite as good as Veritas, but there are no hard specs here.
It seems a bit odd that after no U.S. missions to Venus in over four decades that China would even contemplate sending a similar mission at almost the same time. Then again, this is from a list of many proposed missions, so maybe the similarity is coincidental. https://www.space.com/china-venus-mission-details |
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