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LAMO, aka Low Altitude Mapping Orbit
dilo
post Nov 11 2011, 10:23 PM
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I think is time to start this new topic, now that Dawn is more than half-way in the transition from HAMO to LAMO (as showed in the plot below).

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Explorer1
post Dec 1 2011, 09:01 PM
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Yeah, Dawn's launch was delayed three months, but the ion drive gives so much leeway it didn't matter in the end (compared with a conventional launch to Mars for example, that has a very specific window).
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Greg Hullender
post Dec 2 2011, 06:06 PM
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QUOTE (Explorer1 @ Dec 1 2011, 01:01 PM) *
Yeah, Dawn's launch was delayed three months, but the ion drive gives so much leeway it didn't matter in the end (compared with a conventional launch to Mars for example, that has a very specific window).

Supposedly that delay was running up against the window from Vesta to Ceres, so I suspect there may not be much more leeway to stay at Vesta. Perhaps someone who knows for sure will chime in.

--Greg
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Greg Hullender
post Jan 1 2012, 09:51 PM
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QUOTE (Greg Hullender @ Dec 2 2011, 10:06 AM) *
Supposedly that delay was running up against the window from Vesta to Ceres, so I suspect there may not be much more leeway to stay at Vesta. Perhaps someone who knows for sure will chime in.

--Greg


Sure enough, I got the following from Marc Rayman, which he invited me to share here:

QUOTE
We have quite a bit of technical flexibility to shift the Vesta departure. You're correct that we launched relatively late in the multiyear launch period for reaching both Vesta and Ceres, but that does not impose a significant constraint now. You may recall that our prelaunch model for the solar array power as a function of heliocentric range was demonstrated in flight to be conservative. Thanks to the ion propulsion system, we translated that power margin into the more operationally and scientifically useful resource of residence time at Vesta. But there has always been another constraint, and that is funding. Our mission timeline includes reaching Ceres in February 2015 not for reasons of celestial mechanics but because that is the schedule upon which the budget was formulated. The celestial mechanics is such that the time to travel from Vesta to Ceres is pretty insensitive to the departure date for up to ~ 0.5 years later than July 2012. But leaving later would mean an extension to the primary mission, and that is not budgeted. The simple reality, which I know you recognize, is that funding is extremely (perhaps even uniquely) tight these days.

As soon as we determined the Vesta pole during the approach phase, we knew what it meant for seeing the north pole, but our plan to depart in July 2012 has not changed. Our agreement with NASA HQ (formalized in our level 1 requirements) has always been that we would image at least 80% of the surface of Vesta at 100 m/px in our panchromatic channel and at least three color filters. We have already done better than that, so it is not obvious that we have to see farther north, much as one might consider it to be neat to do so.

In case this appears to be inconsistent with Emily's tweet about what Chris Russell said here at the AGU, let me be be explicit about it. It is correct that we would need to delay departure in order to see all the way to the north pole. That is not the same as saying we will delay departure.

While plans may change, we remain scheduled for departure in July. We already have fabulous data on Vesta, and we certainly will have even more by then. It certainly would be nice to see the entire surface, but even if we don't, there's no doubt that what we will have seen at Vesta will be exceptionally valuable.


Hope everyone has a happy (and interesting) New Year!

--Greg
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Posts in this topic
- dilo   LAMO   Nov 11 2011, 10:23 PM
- - ElkGroveDan   Good thing we aren't calling it a "Low Ma...   Nov 11 2011, 11:53 PM
|- - dilo   Another way to show the progress from HAMO to LAMO...   Nov 14 2011, 04:08 PM
|- - dilo   And finally, we are below 300km height... not far ...   Nov 16 2011, 08:49 PM
- - Phil Stooke   Hopefully the daily image releases will resume sho...   Nov 16 2011, 08:59 PM
|- - stevesliva   QUOTE (Phil Stooke @ Nov 16 2011, 04:59 P...   Nov 16 2011, 09:54 PM
|- - Tunglere   Images from Nov. 10-13 don't currently show up...   Nov 16 2011, 11:47 PM
- - Phil Stooke   The latest four images were posted on the same day...   Nov 17 2011, 04:15 PM
|- - dilo   Updated situation, all plots: Engines are now si...   Nov 17 2011, 10:20 PM
|- - dilo   Now that we have an improved simulator (better Ves...   Nov 18 2011, 05:20 PM
|- - dilo   New update after two long simulator black-outs: B...   Nov 23 2011, 08:41 PM
|- - dilo   Further update: Dawn is almost there!   Nov 25 2011, 10:52 PM
|- - dilo   Now short engine burns are frequent:   Nov 29 2011, 10:05 PM
- - Phil Stooke   "Dawn image EDR data will be publicly release...   Nov 29 2011, 11:54 PM
- - elakdawalla   Time for us to lurk on the Small Bodies Node websi...   Nov 30 2011, 02:34 AM
- - Phil Stooke   This link... http://pds-smallbodies.astro.umd.edu...   Nov 30 2011, 04:18 AM
|- - dilo   QUOTE (Phil Stooke @ Nov 30 2011, 04:18 A...   Dec 1 2011, 07:02 AM
|- - SFJCody   QUOTE (dilo @ Dec 1 2011, 05:02 PM) ...an...   Dec 1 2011, 07:06 AM
|- - angel1801   I did a Solar System Simulator run for Vesta and I...   Dec 1 2011, 12:03 PM
- - Greg Hullender   I think shifting the Vesta departure date would re...   Dec 1 2011, 03:21 PM
|- - algorimancer   QUOTE (Greg Hullender @ Dec 1 2011, 09:21...   Dec 1 2011, 03:49 PM
- - Explorer1   Yeah, Dawn's launch was delayed three months, ...   Dec 1 2011, 09:01 PM
|- - Greg Hullender   QUOTE (Explorer1 @ Dec 1 2011, 01:01 PM) ...   Dec 2 2011, 06:06 PM
|- - Greg Hullender   QUOTE (Greg Hullender @ Dec 2 2011, 10:06...   Jan 1 2012, 09:51 PM
- - stevesliva   http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gal...   Dec 1 2011, 09:52 PM
- - stevesliva   New Dawn Journal: QUOTE There is always a tug dow...   Dec 2 2011, 12:47 AM
- - PDP8E   The Dawn Journal and Dr. Marc Rayman should get so...   Dec 2 2011, 06:50 PM
|- - dilo   I agree, PDP8E.   Dec 3 2011, 06:10 AM
|- - dilo   After last burns, nominal LAMO height (200km above...   Dec 3 2011, 07:22 PM
|- - dilo   No burns in last hours, orbits is now around 185x2...   Dec 4 2011, 09:40 PM
- - machi   Interesting news via Emily's twitter: "R...   Dec 6 2011, 05:53 PM
- - stevesliva   Several updates here: http://dawn.jpl.nasa.gov/mul...   Dec 8 2011, 06:08 AM
- - claurel   Now that Robert Gaskell's shape model of Vesta...   Dec 9 2011, 07:38 PM
|- - claurel   QUOTE (claurel @ Dec 9 2011, 11:38 AM) No...   Dec 13 2011, 11:32 PM
|- - Sarunia   Thank you, I was just preparing a conversion for c...   Dec 13 2011, 11:58 PM
- - ElkGroveDan   Beautiful. Thanks for sharing.   Dec 9 2011, 07:51 PM
- - Sarunia   With the shape from Dr. Robert Gaskell (and provid...   Dec 10 2011, 11:04 PM
|- - dilo   Beautiful simulated views in this video, Sarunia...   Dec 11 2011, 08:34 AM
|- - Sarunia   Thanks, dilo. For the bump projection, a tri-axia...   Dec 11 2011, 07:20 PM
- - Phil Stooke   Nice! This can be turned into a shaded relief...   Dec 11 2011, 02:55 AM
- - Bill Harris   And Nice! ^2, Phil. You can see a lot of his...   Dec 11 2011, 07:23 AM
- - scalbers   Videos of numerous AGU talks on Vesta from this pa...   Dec 11 2011, 04:47 PM
|- - dilo   After long hiatus (related to safe mode event one ...   Dec 11 2011, 05:45 PM
|- - stewjack   QUOTE (scalbers @ Dec 11 2011, 12:47 PM) ...   Dec 11 2011, 09:18 PM
- - djellison   Did my own conversion from the greyscale map into ...   Dec 11 2011, 09:10 PM
- - stevesliva   First (?) image from near LAMO? http://dawn.jpl.na...   Dec 14 2011, 01:43 AM
|- - dilo   QUOTE (stevesliva @ Dec 14 2011, 02:43 AM...   Dec 14 2011, 06:17 AM
- - stevesliva   And now the image of the day is stalled again. Le...   Dec 15 2011, 07:31 PM
|- - dilo   QUOTE (stevesliva @ Dec 15 2011, 08:31 PM...   Dec 15 2011, 07:56 PM
|- - stevesliva   Doh. Thanks for pointing that out, it'll save...   Dec 15 2011, 08:04 PM
- - Jaheira   Is it just me, or does that sharp, young crater in...   Dec 20 2011, 12:55 AM
|- - Marz   QUOTE (Jaheira @ Dec 19 2011, 06:55 PM) I...   Dec 20 2011, 06:54 PM
- - stevesliva   Five LAMO images have appeared here: http://dawn.j...   Dec 21 2011, 06:05 PM
- - volcanopele   14 more names have been approved for use on Vesta,...   Dec 28 2011, 04:25 AM
- - Holder of the Two Leashes   Thanks Greg. I'd be interested to know how fa...   Jan 2 2012, 08:20 AM
- - algorimancer   Spacedaily has an article up today (http://www.spa...   Jan 3 2012, 01:42 PM
- - Greg Hullender   New Dawn Journal: http://dawn.jpl.nasa.gov/mission...   Jan 5 2012, 03:42 PM
- - stevesliva   What a tease to link to the image of the day after...   Jan 5 2012, 09:02 PM
- - Phil Stooke   No... they are here instead: http://dawn.jpl.nasa...   Jan 5 2012, 09:51 PM
- - stevesliva   I know there are some kicking around. Just hopin...   Jan 5 2012, 10:01 PM
|- - pablogm1024   QUOTE (stevesliva @ Jan 5 2012, 11:01 PM)...   Jan 6 2012, 02:49 PM
|- - pablogm1024   QUOTE (pablogm1024 @ Jan 6 2012, 03:49 PM...   Jan 9 2012, 02:54 PM
- - stevesliva   http://dawn.jpl.nasa.gov/multimedia/imageo...p?dat...   Jan 16 2012, 08:08 PM
|- - Marz   Today's image is a nice 3-D anaglyph of impact...   Jan 24 2012, 09:39 PM
- - stevesliva   Three releases on the multimedia page that would s...   Jan 26 2012, 06:28 PM
|- - Marz   QUOTE (stevesliva @ Jan 26 2012, 12:28 PM...   Feb 14 2012, 10:14 PM
- - Phil Stooke   Some pretty clear flows on Vesta in the latest ima...   Feb 5 2012, 03:49 AM
- - ngunn   Good question. I hope you get an answer from someo...   Feb 14 2012, 11:07 PM
- - Greg Hullender   I see that we've got four more months at Vesta...   Feb 16 2012, 02:12 AM
- - Phil Stooke   The short time at Ceres in the primary mission is ...   Feb 16 2012, 02:58 AM
- - scalbers   Here's the released map with feature names put...   Feb 26 2012, 06:00 PM
- - stevesliva   Two interesting image releases on Aricia Tholus la...   Feb 29 2012, 12:08 AM
- - john_s   My impression, especially from those new images, i...   Feb 29 2012, 03:42 AM
- - Gsnorgathon   But doesn't "tholus" just mean hill,...   Feb 29 2012, 11:20 PM
- - john_s   That might be technically true, but "tholus...   Mar 1 2012, 12:37 AM
- - Gsnorgathon   Umm... how about Lucaria Tholus? OK, yeah. That...   Mar 1 2012, 02:23 AM
|- - pablogm1024   QUOTE (Gsnorgathon @ Mar 1 2012, 03:23 AM...   Mar 2 2012, 10:10 AM
- - Phil Stooke   "tholus" on other bodies has typically b...   Mar 2 2012, 02:25 PM
- - Astro0   40 extra days at Vesta! http://www.jpl.nasa.g...   Apr 19 2012, 05:05 AM
- - Phil Stooke   Yes, and they have now released over 200 pictures ...   Apr 19 2012, 12:03 PM
- - charborob   In LAMO, Dawn seems to be taking only nadir-pointi...   Apr 19 2012, 12:14 PM
- - Phil Stooke   LAMO is all about the composition-mapping instrume...   Apr 19 2012, 05:03 PM
|- - pablogm1024   QUOTE (Phil Stooke @ Apr 19 2012, 05:03 P...   Apr 21 2012, 03:16 PM
- - Juramike   A really nice "uber"-image release today...   Apr 25 2012, 06:59 PM
- - Hungry4info   NASA to Hold News Conference on Asteroid Mission R...   May 7 2012, 07:58 PM
- - Mariner9   I suspect that the news conference is timed to coi...   May 8 2012, 05:11 PM
- - Holder of the Two Leashes   News conference set to start in one hour twenty mi...   May 10 2012, 04:42 PM
- - Floyd   About to start, 98+ viewers   May 10 2012, 05:58 PM
- - Explorer1   Starting now...   May 10 2012, 06:00 PM
- - Paolo   meanwhile, papers have appeared in Science http://...   May 10 2012, 06:05 PM
|- - dilo   Interesting conference, though I see less than a d...   May 10 2012, 06:56 PM
|- - DrShank   QUOTE (dilo @ May 10 2012, 12:56 PM) Inte...   May 10 2012, 07:26 PM
|- - elakdawalla   QUOTE (dilo @ May 10 2012, 11:56 AM) Inte...   May 11 2012, 03:40 PM
- - ElkGroveDan   Can we go now? I want to see Ceres.   May 10 2012, 06:31 PM
|- - DrShank   QUOTE (ElkGroveDan @ May 10 2012, 12:31 P...   May 10 2012, 06:51 PM
|- - Paolo   QUOTE (ElkGroveDan @ May 10 2012, 08:31 P...   May 11 2012, 07:05 AM
|- - centsworth_II   It is interesting to know the correct Latin pronun...   May 11 2012, 12:44 PM
- - Holder of the Two Leashes   So, I guess I'll go ahead and hang on to my li...   May 10 2012, 06:44 PM
- - charborob   FWIW, in French, we write "Cérès" and pr...   May 11 2012, 01:35 PM
- - Phil Stooke   Dawn isn't in LAMO now, it's moved back up...   Jul 24 2012, 01:25 AM
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