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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 15 2006, 02:35 PM
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http://bookstore.spie.org/index.cfm?fuseac...d=619857&coden=
QUOTE
Abstract
The Optical Navigation Camera (ONC) is part of NASA's Mars Reconnaissance Orbiter (MRO) scheduled for an August 2005 launch. The design is a 500 mm focal length, F/8.3 Ritchey-Chretien with a refractive field corrector. Prior to flight, the off-axis performance of the ONC was measured at visible wavelengths in the off-axis scatter facility at the Space Dynamics Laboratory (SDL). This unique facility is designed to minimize scatter from the test setup to prevent data corruption. Testing was conducted in a clean room environment, and the results indicate that no detectable contamination of the optics occurred during testing. Measurements were taken in two time frames to correct an unanticipated stray light path, which occurred just outside of the sensor's field-of-view. The source of the offending path was identified as scatter from the edges of the field corrector lenses. Specifically, scatter from the interface between the flat ground glass and polished surfaces resulted in significant "humps" in the off-axis response centered at 1.5. Retesting showed the removal of the humps, and an overall satisfactory performance of the ONC. The troubleshooting, correction, and lessons learned regarding the above stray light path was reported on in an earlier paper. This paper discusses the measurement process, results, and a comparison to a software prediction and other planetary sensors. The measurement validated the final stray light design and complemented the software analysis.


Very little info out there though. That's about all I could find.
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jmknapp
post Feb 15 2006, 03:52 PM
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QUOTE (djellison @ Feb 15 2006, 09:35 AM) *
http://bookstore.spie.org/index.cfm?fuseac...d=619857&coden=
Very little info out there though. That's about all I could find.


Thanks! That paper states that the FOV is 2.8 degrees (+/- 1.4 degees from the optical axis). I can see from the pointing (CK) SPICE kernels for the last few days that they are indeed periodically slewing the ONC across the position of Mars and Phobos/Deimos. Here's one predicted view from a few days ago:



The targets are in the FOV for about a minute. I gather from the paper that the intent is to have Mars outside the FOV for the science observations.


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Bob Shaw
post Feb 15 2006, 07:29 PM
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From the MRO website:

http://mars.jpl.nasa.gov/mro/mission/sc_instru_optical.html

"Optical Navigation Camera

This camera is being tested for improved navigation capability for future missions. If it performs well, similar cameras placed on orbiters of the future would be able to serve as high-precision interplanetary "eyes" to guide incoming spacecraft as they near Mars.

From 30 days to 2 days prior to Mars Orbit Insertion, the spacecraft will collect a series of images of Mars' moons Phobos and Deimos. By comparing the observed position of the moons to their predicted positions, relative to the background stars, the mission team will accurately determine the position of the orbiter in relation to Mars.

While not needed by Mars Reconnaissance Orbiter to navigate to Mars, the data from this experiment will be used to demonstrate that this technique can be used by future spacecraft to ensure their accurate arrival. Accuracy is important to some future landers and rovers that will need extremely precise navigation at Mars arrival to get to their landing sites safely."

So, some interesting images of the moons, perhaps?

Bob Shaw


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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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