LAMO, aka Low Altitude Mapping Orbit |
LAMO, aka Low Altitude Mapping Orbit |
Aug 1 2012, 11:05 PM
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#106
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Further update:
The first engine stop, on July 31, lasted less than 15 hours and, after this, energy increase was very regular. -------------------- I always think before posting! - Marco -
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Aug 5 2012, 06:08 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 |
The second engine stop, on Aug 2-4, was longer (between 30 and 45 hours) and, probably, was used to map the northern emisphere; in fact Dawn flied twice above North Pole at an estimated height of 1450 km (considering Vesta shape). Herebelow last two "revealing shadow" processed images, from Caparronia and Floronia quadrangles, respectively: -------------------- I always think before posting! - Marco -
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Aug 11 2012, 03:03 PM
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#108
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
-------------------- |
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Aug 14 2012, 12:03 AM
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#109
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
http://pds-smallbodies.astro.umd.edu/data_...ase_sched.shtml
According to this data release schedule, we should get raw approach and HAMO data soon at PDS. But the arguments over coordinate systems may delay this a bit. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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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Aug 15 2012, 01:08 AM
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#110
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Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
More reaction wheel problems:
http://www.nasa.gov/mission_pages/dawn/new...wn20120813.html QUOTE During a planned communications pass on Aug. 9, the team learned that the reaction wheel had been powered off. Telemetry data from the spacecraft suggest the wheel developed excessive friction, similar to the experience with another Dawn reaction wheel in June 2010. The Dawn team demonstrated during the cruise to Vesta in 2011 that, if necessary, they could complete the cruise to Ceres without the use of reaction wheels.
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Aug 24 2012, 12:09 PM
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#111
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Yes I got that from this news source.
Now that they are optimistic about getting over to Ceres without reaction wheels, I cant shrug off the thought that the pointing for instruments and camera will be affected. Anyhow since that Dawn is in the departure phase, perhaps it is time to start a 'Cruising to Ceres' thread. =) |
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Aug 24 2012, 08:32 PM
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#112
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Senior Member Group: Members Posts: 1592 Joined: 14-October 05 From: Vermont Member No.: 530 |
Are there only two wheels?
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Aug 24 2012, 10:09 PM
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#113
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Two fully functioning left of the 4 functioning at launch.
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Jan 5 2013, 07:32 AM
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#114
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Senior Member Group: Members Posts: 1592 Joined: 14-October 05 From: Vermont Member No.: 530 |
There are some new captioned releases here:
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery.asp ... and I can't seem to see that they relate to any new paper or conference release. |
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