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HAMO, (aka High Altitude Mapping Orbit)
Phil Stooke
post Sep 1 2011, 01:12 PM
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According to Dawn (who ought to know) the descent to the next mapping orbit is beginning now.

"NASA_Dawn NASA's Dawn Mission

I'm done with Survey science operations today!! Time for a several-week transfer down to High Altitude Mapping Orbit (HAMO)!!

20 hours ago"


Better pics on the way! Thanks, Dawn team, for the pictures so far. Will we learn of any preliminary nomenclature soon?

Phil



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mchan
post Sep 1 2011, 08:17 PM
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Marc Rayman's latest Dawn Journal on HAMO --

"...they have been able to detect variations in the gravity field that are due to the uneven distribution of mass within the protoplanet. With their improved charts of the waters around Vesta, they plotted the ship’s course, and it is now under sail. Thrusting with the ion propulsion system began on August 31 at 4:05 p.m. PDT, and this trip to the high altitude mapping orbit will take a month."
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DrShank
post Sep 2 2011, 05:55 PM
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QUOTE (Phil Stooke @ Sep 1 2011, 07:12 AM) *
According to Dawn (who ought to know) the descent to the next mapping orbit is beginning now.

"NASA_Dawn NASA's Dawn Mission

I'm done with Survey science operations today!! Time for a several-week transfer down to High Altitude Mapping Orbit (HAMO)!!

20 hours ago"


Better pics on the way! Thanks, Dawn team, for the pictures so far. Will we learn of any preliminary nomenclature soon?

Phil



Hi Phil!
Nomenclature work has only just begun. we have been "surveying' the Survey data as it were, simply getting a feel for the geography. Once the coordinate system has been fixed, we will proceed with names. A list of names is ready to go, we just need to identify which features are priority for the first batch of names.
cheers
paul


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Phil Stooke
post Sep 2 2011, 06:00 PM
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Thanks, Paul.

Phil


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dilo
post Sep 3 2011, 07:19 AM
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Thanks for updates, Paul!
Here below the updated velocity/distance plots, current transfer orbit is clearly elliptical.

Attached Image


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DrShank
post Sep 3 2011, 04:29 PM
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QUOTE (dilo @ Sep 3 2011, 01:19 AM) *
Thanks for updates, Paul!
Here below the updated velocity/distance plots, current transfer orbit is clearly elliptical.

Attached Image



no problem. will try to be more informative as the mission goes on, but i get distracted easily . . .

btw, where are u getting that plot from? I should be monitoring it i suppose!


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dilo
post Sep 3 2011, 05:42 PM
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I made by myself using MYSTIC simulator info from JPL Dawn site. Obviously, not real-time data nor continuous coverage, if you have something better, pls give us! rolleyes.gif


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Sarunia
post Sep 3 2011, 08:58 PM
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First Message: Hello everybody smile.gif

Answering dilo:
You can use SPICE data from NAIF: ftp://naif.jpl.nasa.gov/pub/naif/DAWN/kernels/
For example, I product this http://www.youtube.com/watch?v=qWZbcAKXu-s from theses data.
The problem is that you should have some (but little wink.gif) programming skill for using SPICE files.
But the good news is that the NAIF library (see upper node of link) is full of documentations and tools to learn and use it.

But maybe DrShank know a better way ?


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DrShank
post Sep 4 2011, 11:36 PM
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QUOTE (Sarunia @ Sep 3 2011, 02:58 PM) *
First Message: Hello everybody smile.gif

Answering dilo:
You can use SPICE data from NAIF: ftp://naif.jpl.nasa.gov/pub/naif/DAWN/kernels/
For example, I product this http://www.youtube.com/watch?v=qWZbcAKXu-s from theses data.
The problem is that you should have some (but little wink.gif) programming skill for using SPICE files.
But the good news is that the NAIF library (see upper node of link) is full of documentations and tools to learn and use it.

But maybe DrShank know a better way ?


not without doing some research into it . . .


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dilo
post Sep 5 2011, 11:10 AM
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QUOTE (Sarunia @ Sep 3 2011, 08:58 PM) *
...
The problem is that you should have some (but little wink.gif) programming skill for using SPICE files.
But the good news is that the NAIF library (see upper node of link) is full of documentations and tools to learn and use it.

Thanks Sarunia, not an easy task for me (unless someone wants to help on this).
For the moment, I'm still updating from simulator:
Attached Image


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Phil Stooke
post Sep 5 2011, 03:03 PM
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Great pictures recently - not from HAMO yet or even the descent to HAMO, but really giving a taste of what the surface will look like in the weeks to come.

http://dawn.jpl.nasa.gov/multimedia/imageo...=2011-September

I'm especially interested at the moment in this area from the Sept. 3 release:


Attached Image



Interesting bright patches on a darker surface.

Phil



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Gsnorgathon
post Sep 5 2011, 03:36 PM
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Dare I say those lobate margins look like flow features? Fun to think about, anyway!
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Bill Harris
post Sep 6 2011, 10:22 AM
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> I'm especially interested at the moment in this area from the Sept. 3 release:

And why does this crater have an eccentric fill on the floor?
What a peculiar little world.



Attached thumbnail(s)
Attached Image
 


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DrShank
post Sep 6 2011, 01:19 PM
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QUOTE (Bill Harris @ Sep 6 2011, 04:22 AM) *
What a peculiar little world.



The Dawn team could not agree more!

as far as those bright and dark splotches, we are scratching our heads too. they do not seem to have much relief at this resolution (we are
still at ~250 meters and will move to HAMO resolution very slowly) but each significant increase in resolution has forced us to rethink some of our previous conclusions! Vesta is not a simple world.


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Phil Stooke
post Sep 6 2011, 01:49 PM
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The eccentric fill may be a result of a local slope - the fill is horizontal, the crater's tilted. Of course, we need a proper shape model and interior mass distribution model to be sure, but that's my guess.

Phil



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