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: 10173 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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Feb 17 2021, 08:36 AM
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#202
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Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Here's another Venus mission proposal from LPSC 21 that uses a long tether on a spool of some sort.
https://www.hou.usra.edu/meetings/lpsc2021/pdf/1425.pdf While I love these designs are they doable? - we are talking about tethers 10s of km long, being unrolled across zones with radically different temperatures and possible wind shear. I believe wind speeds are expected to be low, but as pressures are so high....? Would anyone like to comment on how feasible this is? P |
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Feb 17 2021, 01:55 PM
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#203
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Senior Member Group: Members Posts: 1584 Joined: 14-October 05 From: Vermont Member No.: 530 |
That would be quite a lot of tether mass. It also doesn't mention if it's a gas balloon... does that go without saying?
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Feb 17 2021, 03:39 PM
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#204
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Member Group: Members Posts: 706 Joined: 22-April 05 Member No.: 351 |
That would be quite a lot of tether mass. It also doesn't mention if it's a gas balloon... does that go without saying? From the abstract: "Current estimates for tow-body mass, incorporating the phase-change material, rechargeable battery power, pressure/temperature sensors, airspeed sensor, accelerometer, the near-infrared imager and a topmounted CCD camera for balloon and sky/cloud viewing on deployment and retraction, is ~2-3 kg. The tether, comprised of high-strength tensile fibers, a Gbspeed optical comm link, and a protective coating for the abrasive atmosphere, is planned to extend ~ 9 km to account for its downwind drift in the prevailing relative wind. The estimated tether mass is 3.6 kg, while the deployment/retraction system on the balloon gondola has an estimated mass of ~ 1 kg. " -------------------- |
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