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HAMO, (aka High Altitude Mapping Orbit)
DrShank
post Oct 26 2011, 01:04 AM
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The spiral pattern is mostly a map projection effect. One of our team has located them and they fit great circles.


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dilo
post Oct 26 2011, 05:13 AM
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QUOTE
We will keep you posted.

Thanks pablo!


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alan
post Oct 27 2011, 04:07 PM
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QUOTE (DrShank @ Oct 25 2011, 08:04 PM) *
The spiral pattern is mostly a map projection effect. One of our team has located them and they fit great circles.

Sounds like they are due to the impacts of orbiting debris.
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Phil Stooke
post Oct 27 2011, 07:31 PM
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On Iapetus, that process is called on to create a ridge... can it do both?

Phil



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stevesliva
post Oct 27 2011, 11:10 PM
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QUOTE (alan @ Oct 27 2011, 12:07 PM) *
Sounds like they are due to the impacts of orbiting debris.


If you watch the replay of the presentation that I linked to above, they mention that they are wide, flat-bottomed with steep sides. Certainly don't sound like crater chains. The also believe the ages of the equatorial ones correspond to the Rheasilvia impact and the northern ones to the older southern basin.
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DrShank
post Oct 28 2011, 02:50 AM
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Impact debris here would form radial or spiral from the center. These are extension cracks formed from several possible sources. Examples include shape change and reorientation. Among others. It's proving difficult to get the exact ages however and we have some numerical models yet to test. Should be interesting!


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Sarunia
post Nov 1 2011, 09:47 AM
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QUOTE (machi @ Oct 24 2011, 11:22 AM) *
Vesta in almost natural colors (filters centered at 440, 650 and 750 nm).
Two basic images:

English captions and 5 other versions are here.
Original raw images are available here.


Wow ! Great work, and thank you for the raw. How did you get these ?
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machi
post Nov 1 2011, 05:43 PM
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I haven't much informations about this, I know only, that it's from anonymous source in the Dawn team and it was one-time thing, so we must
wait now for another (raw) data until official release (~ end of year 2012).


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Sarunia
post Nov 2 2011, 07:27 PM
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QUOTE (machi @ Nov 1 2011, 06:43 PM) *
I haven't much informations about this, I know only, that it's from anonymous source in the Dawn team and it was one-time thing, so we must
wait now for another (raw) data until official release (~ end of year 2012).


Ok. Thanks Machi.
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dilo
post Nov 3 2011, 07:32 AM
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As probably you noticed in the simulator, starting from yesterday Dawn ignited engines and started spiraling toward LAMO:
Attached Image

Edit: I updated the plot with last data...


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Stefan
post Nov 3 2011, 05:32 PM
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QUOTE (machi @ Nov 1 2011, 06:43 PM) *
I haven't much informations about this, I know only, that it's from anonymous source in the Dawn team and it was one-time thing, so we must
wait now for another (raw) data until official release (~ end of year 2012).


Hi Machi,

Our "raw" FC images are certainly not in 8 bit PNG format and we don't produce them in Photoshop, so what you obtained from this anonymous source cannot be described as raw. You had to work with what you had, and you did a fine job producing those color images, but it is beyond me how Emily can present your images on her blog as "nearly natural color".

Stefan.
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machi
post Nov 3 2011, 06:35 PM
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Hi Stefan

QUOTE
"Our "raw" FC images are certainly not in 8 bit PNG format and we don't produce them in Photoshop,
so what you obtained from this anonymous source cannot be described as raw"

Yes, I wrote this inaccurately. What I wanted to write is, that this kind of images
(directly derived from real raw images, with some basic informations about them,
which allow this kind of processing), will not be available until next year.
All published images are without these informations, or they are strongly derived.

QUOTE
"You had to work with what you had, and you did a fine job producing those color images"

Thanks!

QUOTE
"but it is beyond me how Emily can present your images on her blog as "nearly natural color""

Because source images are not in appropriate spectral bands and even more, I have no idea, if these are calibrated or not,
I don't know exactly how close to "natural" these images are. Some published spectra looks flat for Vesta (in visible),
so I tried similar settings for final images.
For now, few images in "natural" colors was published (here) , so
direct comparison is possible (btw these images are using red on 700 nm).

ADMIN FORMATTING EDIT


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dilo
post Nov 5 2011, 06:35 AM
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Engines cut-off few hours ago, around 530 km height... probably thrust will resume soon:
Attached thumbnail(s)
Attached Image
 


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Floyd
post Nov 5 2011, 02:44 PM
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What is the target altitude for LAMO? Edit found it:180 km. That low to get gravity field. See Marc Rayman's December 10, 2010 post on the Dawn Jornal


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dilo
post Nov 6 2011, 07:22 PM
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Further update, showing in grey periods with engines off (with very indicative start/end times):
Attached Image

Based on a private comunication from Dr Rayman, these thrust interruptions will become more frequent while descending in Vesta's gravity field; main purpose is to re-orient spacecraft in order to transmit radiometric data and establish/transmit new thrust profile.

Edit: updated to Nov,7 18:00 UTC - new engine stop lasting 21 hrs, up to now!


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