HAMO, (aka High Altitude Mapping Orbit) |
HAMO, (aka High Altitude Mapping Orbit) |
Oct 26 2011, 01:04 AM
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#106
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Member Group: Members Posts: 207 Joined: 6-March 07 From: houston, texas Member No.: 1828 |
The spiral pattern is mostly a map projection effect. One of our team has located them and they fit great circles. -------------------- Dr. Paul Schenk, Lunar and Planetary Institute, Houston TX
http://stereomoons.blogspot.com; http://www.youtube.com/galsat400; http://www.lpi.usra.edu/science/schenk/ |
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Oct 26 2011, 05:13 AM
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#107
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE We will keep you posted. Thanks pablo! -------------------- I always think before posting! - Marco -
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Oct 27 2011, 04:07 PM
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#108
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
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Oct 27 2011, 07:31 PM
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#109
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
On Iapetus, that process is called on to create a ridge... can it do both?
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Oct 27 2011, 11:10 PM
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#110
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
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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Oct 28 2011, 02:50 AM
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#111
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Member Group: Members Posts: 207 Joined: 6-March 07 From: houston, texas Member No.: 1828 |
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!
-------------------- Dr. Paul Schenk, Lunar and Planetary Institute, Houston TX
http://stereomoons.blogspot.com; http://www.youtube.com/galsat400; http://www.lpi.usra.edu/science/schenk/ |
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Nov 1 2011, 09:47 AM
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#112
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
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Nov 1 2011, 05:43 PM
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#113
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
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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Nov 2 2011, 07:27 PM
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#114
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
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Nov 3 2011, 07:32 AM
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#115
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
As probably you noticed in the simulator, starting from yesterday Dawn ignited engines and started spiraling toward LAMO:
Edit: I updated the plot with last data... -------------------- I always think before posting! - Marco -
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Nov 3 2011, 05:32 PM
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#116
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
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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Nov 3 2011, 06:35 PM
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#117
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
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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Nov 5 2011, 06:35 AM
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#118
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Engines cut-off few hours ago, around 530 km height... probably thrust will resume soon:
-------------------- I always think before posting! - Marco -
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Nov 5 2011, 02:44 PM
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#119
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
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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Nov 6 2011, 07:22 PM
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#120
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Further update, showing in grey periods with engines off (with very indicative start/end times):
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! -------------------- I always think before posting! - Marco -
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