Arsia Mons Anomaly?, Recent Mars Express Imagery shows odd feature |
Arsia Mons Anomaly?, Recent Mars Express Imagery shows odd feature |
Nov 16 2018, 06:02 AM
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#46
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Junior Member Group: Members Posts: 20 Joined: 22-February 06 Member No.: 688 |
Changing course...
Is there a limitation on conventional landings with chutes happening near one of the Tharsis 4? Atmosphere must be extra thin up there. The huge flat caldera on Arsia seems to beckon for a lander or rover. The "spiral cloud" (caldera confined circulating aerosol suspension) might make things interesting as an engineering challenge. What use is there for a high altitude station on Mars? -------------------- UMSF Newbie since 2006.
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Nov 16 2018, 07:08 AM
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#47
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Senior Member Group: Members Posts: 2504 Joined: 13-September 05 Member No.: 497 |
Is there a limitation on conventional landings with chutes happening near one of the Tharsis 4? https://marsnext.jpl.nasa.gov/scieng_eng.cfm says that the Mars2020 landing site, for example, has to be below -0.5 km MOLA elevation, with respect to the MOLA geoid. So you can forget about landing on the volcanoes unless you are using purely propulsive landing (no parachutes.) -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Guest_mcmcmc_* |
Nov 16 2018, 10:40 AM
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#48
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Guests |
https://marsnext.jpl.nasa.gov/scieng_eng.cfm says that the Mars2020 landing site, for example, has to be below -0.5 km MOLA elevation, with respect to the MOLA geoid. So you can forget about landing on the volcanoes unless you are using purely propulsive landing (no parachutes.) why don't landers make aerobraking in orbit rather than landing directly? There would be much less energy to dissipate (just potential energy from 100km altitude rather than all the energy produced by the launcher). |
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Nov 16 2018, 02:06 PM
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#49
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
The do, as far as possible, first with the heat shield, later with parachutes. But with a few hPa, it's hard to slow down to subsonic velocities by mere aerobreaking.
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Nov 16 2018, 02:36 PM
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#50
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Senior Member Group: Members Posts: 2504 Joined: 13-September 05 Member No.: 497 |
why don't landers make aerobraking in orbit rather than landing directly? It would require a large engine and a lot of fuel to get into orbit first, but Viking did do that. You still need a parachute. If you're talking about aerocapture to get into orbit, I'm not sure why you think it would help landing. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Nov 16 2018, 09:28 PM
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#51
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Junior Member Group: Members Posts: 20 Joined: 22-February 06 Member No.: 688 |
https://marsnext.jpl.nasa.gov/scieng_eng.cfm says that the Mars2020 landing site, for example, has to be below -0.5 km MOLA elevation, with respect to the MOLA geoid. So you can forget about landing on the volcanoes unless you are using purely propulsive landing (no parachutes.) Hmm. Not much (unvisited) terrain left with those constraints.. A visit to Beagle 2 crater in Isidis? A slow climb up Elysium Mons maybe? -------------------- UMSF Newbie since 2006.
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Nov 17 2018, 02:00 AM
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#52
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
...If you're talking about aerocapture to get into orbit, I'm not sure why you think it would help landing. aerocapture orbits take quite an extended time to slow the velocity and round out the orbit (adding operations cost to the budget), when that energy can be dispersed much quicker via the well-proven heatsheild method. I'd assume the orbital speed will still be high enough that you'd have use a heatshield for the orbital-to-atmopspheric entry anyways but i am only guessing... I was curious to find the relative velocities of direct atmospheric entry modes vs the slowest possible option for orbital insertion trajectories but ran out of time, here are some starter resources though. |
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