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Mro On Approach, TCM-3 not required
Redstone
post Feb 3 2006, 11:06 PM
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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! smile.gif
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djellison
post Feb 17 2006, 09:59 PM
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Being VERY unscientific, approx speed at periareion using Orbiter with these apareion's....

10000km - 4330 m/sec
18000km - 4460 m/sec
28000km - 4590 m/sec
38000km - 4650 m/sec
45000km - 4670 m/sec

So to vary between 28000 and 45000 is only a 80ish m/sec difference, in an MOI burn of I believe roughly 1000 m/sec over 25 minutes - so +/- 40m/sec is about a 4% error, or 1 minute of the burn

200 x 400km orbit is approx 3520 - 3320 m/sec ish -so aerobraking is giving us another 1000 m/sec of delta V.

All figures very VERY roughly done in orbiter.

Doug
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Bob Shaw
post Feb 17 2006, 10:46 PM
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The way I see it, almost *any* orbit is better than an unplanned landing mission. And I was, originally, really trying *not* to be cruel about the MCO trajectory, honest! I didn't *need* to be cruel, not with you lot aboard...

Bob Shaw


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Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Guest_AlexBlackwell_*
post Feb 17 2006, 10:52 PM
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QUOTE (Bob Shaw @ Feb 17 2006, 10:46 PM) *
I didn't *need* to be cruel, not with you lot aboard...

Hey, you forgot to include the appropriate emoticon. Or did you forget? blink.gif
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Posts in this topic
- Redstone   Mro On Approach   Feb 3 2006, 11:06 PM
- - RNeuhaus   Good news. I seems that MRO has started to gain it...   Feb 4 2006, 04:41 AM
|- - ugordan   QUOTE (RNeuhaus @ Feb 4 2006, 05:41 AM)I seem...   Feb 4 2006, 12:13 PM
|- - jmknapp   QUOTE (ugordan @ Feb 4 2006, 07:13 AM) As...   Feb 15 2006, 01:19 PM
|- - jmknapp   PS: Does anyone know what the field-of-view and re...   Feb 15 2006, 02:28 PM
- - abalone   QUOTE (Redstone @ Feb 4 2006, 10:06 AM)MRO ha...   Feb 4 2006, 12:49 PM
- - djellison   It's odd to think that from 'aboe' - M...   Feb 4 2006, 03:19 PM
|- - SFJCody   How many pixels would HiRise get across the disc o...   Feb 4 2006, 03:50 PM
|- - mcaplinger   QUOTE (SFJCody @ Feb 4 2006, 07:50 AM)How man...   Feb 4 2006, 05:26 PM
- - djellison   This is from a little PDF I found at the same plac...   Feb 4 2006, 05:41 PM
|- - crabbsaline   QUOTE (djellison @ Feb 4 2006, 12:41 PM)This ...   Feb 7 2006, 11:11 AM
- - djellison   I think they're using the ONC more as a tech-d...   Feb 7 2006, 11:57 AM
- - djellison   http://bookstore.spie.org/index.cfm?fuseac...d=619...   Feb 15 2006, 02:35 PM
|- - jmknapp   QUOTE (djellison @ Feb 15 2006, 09:35 AM)...   Feb 15 2006, 03:52 PM
|- - Bob Shaw   From the MRO website: http://mars.jpl.nasa.gov/mr...   Feb 15 2006, 07:29 PM
|- - jmknapp   I made an animation of the approach through the fi...   Feb 16 2006, 03:35 PM
- - djellison   Given the addition of some post-moi-pre-aerobrakin...   Feb 16 2006, 03:46 PM
|- - jmknapp   QUOTE (djellison @ Feb 16 2006, 10:46 AM)...   Feb 16 2006, 05:00 PM
|- - mcaplinger   QUOTE (jmknapp @ Feb 16 2006, 09:00 AM) L...   Feb 16 2006, 05:34 PM
|- - jmknapp   QUOTE (mcaplinger @ Feb 16 2006, 12:34 PM...   Feb 16 2006, 06:03 PM
|- - helvick   QUOTE (jmknapp @ Feb 16 2006, 06:03 PM) W...   Feb 16 2006, 06:30 PM
|- - mcaplinger   QUOTE (jmknapp @ Feb 16 2006, 10:03 AM) W...   Feb 16 2006, 10:14 PM
|- - jmknapp   QUOTE (mcaplinger @ Feb 16 2006, 05:14 PM...   Feb 16 2006, 10:42 PM
|- - mcaplinger   QUOTE (jmknapp @ Feb 16 2006, 02:42 PM) I...   Feb 16 2006, 11:31 PM
|- - jmknapp   QUOTE (mcaplinger @ Feb 16 2006, 06:31 PM...   Feb 17 2006, 02:00 AM
|- - mcaplinger   QUOTE (jmknapp @ Feb 16 2006, 06:00 PM) H...   Feb 17 2006, 04:05 AM
|- - Bob Shaw   QUOTE (mcaplinger @ Feb 17 2006, 04:05 AM...   Feb 17 2006, 12:18 PM
|- - AlexBlackwell   QUOTE (Bob Shaw @ Feb 17 2006, 12:18 PM) ...   Feb 17 2006, 06:13 PM
|- - jmknapp   QUOTE (AlexBlackwell @ Feb 17 2006, 01:13...   Feb 17 2006, 06:28 PM
||- - AlexBlackwell   QUOTE (jmknapp @ Feb 17 2006, 06:28 PM) B...   Feb 17 2006, 06:34 PM
||- - elakdawalla   QUOTE (AlexBlackwell @ Feb 17 2006, 10:34...   Feb 17 2006, 06:36 PM
||- - AlexBlackwell   QUOTE (elakdawalla @ Feb 17 2006, 06:36 P...   Feb 17 2006, 06:50 PM
|- - mcaplinger   QUOTE (AlexBlackwell @ Feb 17 2006, 10:13...   Feb 17 2006, 07:50 PM
|- - AlexBlackwell   QUOTE (mcaplinger @ Feb 17 2006, 07:50 PM...   Feb 17 2006, 08:06 PM
||- - djellison   QUOTE (AlexBlackwell @ Feb 17 2006, 08:06...   Feb 17 2006, 08:09 PM
||- - RNeuhaus   QUOTE (AlexBlackwell @ Feb 17 2006, 03:06...   Feb 17 2006, 10:55 PM
|- - jmknapp   QUOTE (mcaplinger @ Feb 17 2006, 02:50 PM...   Feb 17 2006, 09:39 PM
|- - ElkGroveDan   QUOTE (jmknapp @ Feb 17 2006, 09:39 PM) F...   Feb 17 2006, 11:06 PM
- - Sunspot   I kept reading that they wouldn't be doing any...   Feb 16 2006, 05:15 PM
- - Phil Stooke   It wouldn't be targeted, just whatever they ar...   Feb 16 2006, 06:49 PM
|- - babakm   Some imaging of Phoenix candidate site D is on the...   Feb 16 2006, 07:05 PM
- - RNeuhaus   Below is the Sout Pole Cap that looks different th...   Feb 16 2006, 07:10 PM
|- - brianc   A nice article about the MRO HIRISE camera syst...   Feb 16 2006, 08:00 PM
- - djellison   Thing is - only a tiny tiny change in the altitiud...   Feb 17 2006, 12:47 PM
- - Phil Stooke   Emily: "I guess no joke is too old and tired...   Feb 17 2006, 06:58 PM
|- - lyford   QUOTE (Phil Stooke @ Feb 17 2006, 10:58 A...   Feb 17 2006, 08:06 PM
|- - dvandorn   QUOTE (lyford @ Feb 17 2006, 02:06 PM) It...   Feb 18 2006, 12:57 AM
|- - Bob Shaw   QUOTE (dvandorn @ Feb 18 2006, 12:57 AM) ...   Feb 18 2006, 01:06 AM
- - djellison   Being VERY unscientific, approx speed at periareio...   Feb 17 2006, 09:59 PM
|- - Bob Shaw   The way I see it, almost *any* orbit is better tha...   Feb 17 2006, 10:46 PM
|- - AlexBlackwell   QUOTE (Bob Shaw @ Feb 17 2006, 10:46 PM) ...   Feb 17 2006, 10:52 PM
- - AlexBlackwell   Feb. 17, 2006 Dwayne Brown/Erica Hupp Headquarter...   Feb 17 2006, 10:25 PM
- - dvandorn   I think it's probably safest to blame it all o...   Feb 18 2006, 01:19 AM
- - yaohua2000   Mars Reconnaissance Orbiter was only 5 million kil...   Feb 19 2006, 01:12 AM
- - RNeuhaus   After reading more details about MRO. I found it m...   Feb 19 2006, 06:14 AM
|- - djellison   [quote name='RNeuhaus' post='42269' date='Feb 19 2...   Feb 19 2006, 09:32 AM
|- - helvick   QUOTE (djellison @ Feb 19 2006, 09:32 AM)...   Feb 19 2006, 10:57 AM
- - The Messenger   Nice collection of details. Hydrazine (HN#NH) has ...   Feb 19 2006, 06:35 AM
|- - dilo   Thanks for resuming all these infos, Rodolfo (perh...   Feb 19 2006, 07:50 AM
- - deglr6328   QUOTE (RNeuhaus @ Feb 19 2006, 06:14 AM) ...   Feb 19 2006, 10:46 AM
- - Airbag   Another interesting tidbit - MRO uses the same X-b...   Feb 19 2006, 07:26 PM
|- - Bob Shaw   QUOTE (Airbag @ Feb 19 2006, 07:26 PM) An...   Feb 19 2006, 09:41 PM
|- - belleraphon1   QUOTE (Airbag @ Feb 19 2006, 02:26 PM) An...   Feb 20 2006, 12:51 AM
- - Myran   QUOTE Bob Shaw said Am I alone in thinking that th...   Feb 19 2006, 11:03 PM
- - djellison   I imagine that a spacecraft that notices a signal ...   Feb 19 2006, 11:07 PM
|- - Steve   QUOTE (djellison @ Feb 19 2006, 06:07 PM)...   Feb 19 2006, 11:27 PM
|- - Bob Shaw   QUOTE (Steve @ Feb 19 2006, 11:27 PM) Ass...   Feb 19 2006, 11:40 PM
- - djellison   I was thinking that, I imagine they can sequence t...   Feb 19 2006, 11:42 PM
- - edstrick   On it's second lunar day, JPL tried to get Sur...   Feb 20 2006, 06:08 AM
|- - ugordan   Don't the DSN uplink commands have a sort of d...   Feb 20 2006, 08:27 AM
- - edstrick   I think we're dealing with paleolithic technol...   Feb 20 2006, 08:46 AM
|- - Airbag   QUOTE (edstrick @ Feb 20 2006, 03:46 AM) ...   Feb 20 2006, 07:22 PM
|- - Bob Shaw   Can I patent interplanetary MAC addresses - they c...   Feb 20 2006, 10:18 PM
|- - helvick   QUOTE (Bob Shaw @ Feb 20 2006, 10:18 PM) ...   Feb 21 2006, 12:08 AM
|- - Bob Shaw   QUOTE (helvick @ Feb 21 2006, 12:08 AM) I...   Feb 21 2006, 11:16 AM
|- - helvick   QUOTE (Bob Shaw @ Feb 21 2006, 11:16 AM) ...   Feb 21 2006, 02:19 PM
|- - mcaplinger   QUOTE (Bob Shaw @ Feb 21 2006, 03:16 AM) ...   Feb 21 2006, 02:39 PM
- - Myran   QUOTE Airbag said: Change Opportunity's antenn...   Feb 20 2006, 10:40 PM
- - djellison   As I understand it - spacecraft are all moving ver...   Feb 21 2006, 03:27 PM
- - Toma B   Is there any planed imaging with HiRISE on approac...   Feb 24 2006, 07:47 AM
|- - ugordan   There's always a good reason for not performin...   Feb 24 2006, 08:06 AM
|- - djellison   --><div class='quotetop'>QUOTE(T...   Feb 24 2006, 08:27 AM
- - Sunspot   The same was done with Cassini during the week or ...   Feb 24 2006, 09:38 AM
- - AlexBlackwell   The MRO arrival press kit is now up: Mars Reconna...   Feb 24 2006, 04:35 PM
|- - mcaplinger   QUOTE (AlexBlackwell @ Feb 24 2006, 08:35...   Feb 26 2006, 06:06 PM
- - djellison   And the press conf is in an hour and a bit as well...   Feb 24 2006, 04:53 PM
|- - jmknapp   QUOTE (djellison @ Feb 24 2006, 11:53 AM)...   Feb 25 2006, 03:29 PM
- - RNeuhaus   The MRO spacecraft will remain out of contact for ...   Feb 26 2006, 06:27 PM
|- - The Messenger   QUOTE (RNeuhaus @ Feb 26 2006, 11:27 AM) ...   Feb 27 2006, 04:17 PM
|- - Bob Shaw   QUOTE (RNeuhaus @ Feb 26 2006, 06:27 PM) ...   Feb 27 2006, 04:21 PM
- - edstrick   With apollo, for both orbit insertion and trans-ea...   Feb 27 2006, 07:10 AM
|- - jmknapp   Does anyone know which DSN stations and/or other f...   Feb 27 2006, 03:32 PM
|- - RNeuhaus   QUOTE (jmknapp @ Feb 27 2006, 10:32 AM) D...   Feb 27 2006, 07:07 PM
|- - mcaplinger   QUOTE (RNeuhaus @ Feb 27 2006, 11:07 AM) ...   Feb 27 2006, 07:46 PM
- - djellison   Of course - the reason for having such a low targe...   Feb 27 2006, 04:28 PM
|- - jmknapp   QUOTE (djellison @ Feb 27 2006, 11:28 AM)...   Feb 27 2006, 04:50 PM
|- - mcaplinger   QUOTE (djellison @ Feb 27 2006, 08:28 AM)...   Feb 27 2006, 04:54 PM
- - djellison   Stanford was listening to MER because MER was also...   Feb 27 2006, 04:53 PM
- - djellison   Ahh - someone mis-quoted the press pdf previously ...   Feb 27 2006, 05:01 PM
- - Bob Shaw   QUOTE (djellison @ Feb 27 2006, 05:01 PM)...   Feb 27 2006, 05:11 PM
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