Mro On Approach, TCM-3 not required |
Mro On Approach, TCM-3 not required |
Feb 3 2006, 11:06 PM
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#1
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Member Group: Members Posts: 134 Joined: 13-March 05 Member No.: 191 |
MRO has shifted from the cruise phase to Approach phase. Apparently, the trajectory is so good that TCM-3 was cancelled. This is good news for the prospects for a long life for MRO supporting future missions. TCM-4 is on Feb 28, and MOI on March 10. Only 5 weeks away!
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Feb 27 2006, 09:28 PM
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#2
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
Is it just me - or is there some great documentation listed....but not accesable Sort of a wave-candy-infront-of-baby type thing
Doug |
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Guest_AlexBlackwell_* |
Feb 27 2006, 10:02 PM
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#3
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Guests |
Is it just me - or is there some great documentation listed....but not accesable Sort of a wave-candy-infront-of-baby type thing Sorry about that, Doug. I thought only the second "Documentation" link was reserved for team access (i.e., requires a userid and password). It looks as if the first tree is as well. |
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Mar 1 2006, 01:18 PM
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#4
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
I generated a view of Earth as MRO comes out of occultation on March 10th, based on the "ideal" NAIF kernel:
The above is in spacecraft time not accounting for speed of light. The signal would get to Earth 11 minutes, 58 seconds later, at 22:16:00 UTC (5:16pm EST) . -------------------- |
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Mar 1 2006, 02:06 PM
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#5
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
I generated a view of Earth as MRO comes out of occultation on March 10th, based on the "ideal" NAIF kernel: The above is in spacecraft time not accounting for speed of light. The signal would get to Earth 11 minutes, 58 seconds later, at 22:16:00 UTC (5:16pm EST) . Now, if only that could be photographed during the aerobraking test image campaign... Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Mar 1 2006, 02:16 PM
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#6
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Now, if only that could be photographed during the aerobraking test image campaign... Not to mention there haven't been all that many cameras with a 0.005 degree FOV flown on planetary missions... -------------------- |
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Mar 1 2006, 02:28 PM
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#7
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
Not to mention there haven't been all that many cameras with a 0.005 degree FOV flown on planetary missions... http://hirise.lpl.arizona.edu/HiRISE/image...rise_params.gif 1.14 degrees for HiRISE - which is just a tiny bit more than this much http://space.jpl.nasa.gov/cgi-bin/wspace?t...orbs=1&showsc=1 Doug |
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Mar 1 2006, 03:17 PM
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#8
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
1.14 degrees for HiRISE - which is just a tiny bit more than this much Even so, at HiRISE resolution of 1 urad/pixel, Earth being 59 urad (0.0033 deg) across would be ~59 pixels. Approximately this resolution (blown up to 512 pixels across): On the Earthrise time for the HGA, I don't suppose that the Mars atmosphere affects the X-band very much? -------------------- |
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Mar 1 2006, 03:31 PM
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#9
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
On the Earthrise time for the HGA, I don't suppose that the Mars atmosphere affects the X-band very much? The effect is probably negligible, even more so due to the fact Mars' atmosphere contains virtually no vater wapor. The above simulated image would in reality be suspended in a thick reddish tint due to the atmosphere, and the whole Earthrise would have to be very carefully timed even if one knew the precise orbit MRO has -- which obviously won't be the case due to varying performance of the engines during MOI. In short, aiming for this KODAKMMT would be very, very hard and the end result wouldn't be all that rewarding. -------------------- |
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Mar 1 2006, 05:10 PM
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#10
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
In short, aiming for this KODAKMMT would be very, very hard and the end result wouldn't be all that rewarding. Probably true for this shot but I reckon that a shot of Earthrise over the Martian atmosphere that had this sort of resolution would be a stunningly evocotave picture. |
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Mar 1 2006, 05:33 PM
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#11
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
Probably true for this shot but I reckon that a shot of Earthrise over the Martian atmosphere that had this sort of resolution would be a stunningly evocotave picture. I'm skeptical about that. The relative sizes of Mars and the Earth from martian orbit make an Apollo-style Earthrise picture impossible. And the martian limb is pretty diffuse. With the degree of magnfication required to resolve the Earth, the limb would be huge and probably featureless. I tried to take a "Phobos rising over the limb" image with MOC (see http://www.msss.com/mars_images/moc/2003/06/23/ ) but test images of the limb with the NA were so bad that I quit trying to get the limb and Phobos in the same NA swath (which was hard anyway due to timing and data volume constraints.) -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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