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OFMM Discussions for the OFMM project.

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Old 01-09-2012, 12:49 AM   #91
Urwumpe
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How much dV do you plan with? Depending on how we deploy it, we need different maneuver budgets for it.

When we release it during Earth-Mars-Transfer, we only need a little bit of dV for correcting impact site.

If we release it from Mars Orbit, we need much more dV for getting a steep enough reentry angle.
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Old 01-09-2012, 12:50 AM   #92
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Hope you don't break Mars.
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Old 01-09-2012, 12:58 AM   #93
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Looks good! I think she will go boom quite adequately.
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Old 01-09-2012, 01:00 AM   #94
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Quote:
Originally Posted by Donamy View Post
 Hope you don't break Mars.
if it doesn't fit, use a bigger hammer!

Last edited by Urwumpe; 01-09-2012 at 01:22 AM. Reason: Proper translation of German proverb
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Old 01-09-2012, 01:01 AM   #95
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It has around 500 m/s dV with the current code, using solid motors for deorbit
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Old 01-09-2012, 03:04 AM   #96
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Quote:
Originally Posted by Urwumpe View Post
 if it doesn't fit, use a bigger hammer!
First rule of mechanical engineering?
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Old 01-09-2012, 06:35 PM   #97
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somoeone might want to inspect impact crater after impactor hits mars surface:

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Old 01-09-2012, 07:08 PM   #98
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Good idea! no work needed to expose multiple layers of regolith. If we kick it out while in transit, then give it a slight nudge, and have it target near the planned LZ, it's a short hop away. However, we would need to have the sensors emplaced beforehand. Could we place them on the cargo landers (the seismometers)?
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Old 01-09-2012, 09:30 PM   #99
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Short before reentry

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Old 01-09-2012, 09:48 PM   #100
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Quote:
Originally Posted by MaverickSawyer View Post
 Good idea! no work needed to expose multiple layers of regolith. If we kick it out while in transit, then give it a slight nudge, and have it target near the planned LZ, it's a short hop away. However, we would need to have the sensors emplaced beforehand. Could we place them on the cargo landers (the seismometers)?
how close to the LZ? If its too close, you run the risk of the guidance going kaput and you smashing the LZ to shreds. About 15-20 KM seems about far enough. Or am I missing something?
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Old 01-09-2012, 09:58 PM   #101
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Quote:
Originally Posted by mojoey View Post
 how close to the LZ? If its too close, you run the risk of the guidance going kaput and you smashing the LZ to shreds. About 15-20 KM seems about far enough. Or am I missing something?
If we have humans on the transit, we should be able to separate it a day before capture burn and still get its guidance within 800 meters accurate. We just need to track it from the main spacecraft to keep the navigation fixes correct.

Still, we don't want it to impact near the LZ, we want it at the right distance to get seismic data... 135 great circle distance to the seismometer array should do it.

Accuracy during landing is needed for another reason: It reduces the errors in the seismic data. We can reconstruct the impact zone from the seismic data, but we get more inaccuracy, the worse the impact accuracy is to start with.if we can monitor the impact visually from space with a telescope, we should be able to get much better impact data, but I can't tell the visibility during this work-load heavy phase.

Maybe we should coordinate the impact with a previously deployed Mars satellite.

Last edited by Urwumpe; 01-09-2012 at 10:01 PM.
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Old 01-09-2012, 10:01 PM   #102
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Quote:
Originally Posted by Urwumpe View Post
 If we have humans on the transit, we should be able to separate it a day before capture burn and still get its guidance within 800 meters accurate. We just need to track it from the main spacecraft to keep the navigation fixes correct.

Still, we don't want it to impact near the LZ, we want it at the right distance to get seismic data... 135 great circle distance to the seismometer array should do it.
Well, i'm more concerned with the guidance system failing and it not impacting on target or somewhere like the LZ... 135* circle sounds about right...
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Old 01-09-2012, 10:13 PM   #103
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... and the impact zone:
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Old 01-09-2012, 10:17 PM   #104
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Quote:
Originally Posted by Loru View Post
 ... and the impact zone:
Did you use the proper crater size? It looks so big.

(BTW: In reality it is more deep than high, the crater rims are too steep and too high compared to the depth of the crater)
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Old 01-09-2012, 10:19 PM   #105
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It's around 60 meter wide
Too big?
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