Dawn approaches Vesta, Approach phase, 3 May to 16 July 2011 |
Dawn approaches Vesta, Approach phase, 3 May to 16 July 2011 |
Jun 27 2011, 01:49 AM
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#271
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
New Dawn Journal.
http://dawn.jpl.nasa.gov/mission/journal_06_23_11.asp Highlights: QUOTE To achieve the navigational accuracy required to reach the intended orbit in early August, last week the frequency of imaging was increased to twice per week. In each session, half of the pictures are taken with long exposures to ensure many stars are detectable, thus overexposing the much brighter disc of the nearby Vesta. QUOTE Twice in the next few weeks, the spacecraft will watch Vesta throughout its complete 5.3-hour rotation on its axis, revealing exciting new perspectives on this uncharted body. The explorer also will search for moons of the alien world. It promises regular updates of pictures here: http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery.asp QUOTE The next log will be posted shortly after Dawn is in a high, loose orbit around Vesta, still spiraling down toward survey orbit, where it will begin making detailed studies of its home for the subsequent year. So expect another log after July 16 or so. --Greg |
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Jun 27 2011, 02:16 AM
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#272
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Bit late to the party, I know, but here's my take on the June 20th sequence:
http://www.youtube.com/watch?v=4cuAJ4b45IA -------------------- |
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Jun 28 2011, 03:28 AM
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#273
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Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
74,000 miles to go. Pictures should be around fifty pixels now. According to the simulated views on the website, DAWN has not been thrusting for several hours, so perhaps they are making their first full rotation movie now.
Also, from my own wikipedia based rough calculations, I'm finding that Vesta's gravity, over the course of a 24 hour day, is currently accelerating the spacecraft to the tune of adding about one quarter of one mile per hour to its approach speed. In metric, an extra 0.12 meters per second per day. |
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Jun 29 2011, 01:59 AM
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#274
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
The Dawn Framing Camera is holding a vote on Facebook.
QUOTE It wants to know if we'd be interested in Q&A with the Framing Camera Team (hearing about how images are commanded and acquired) or if we just want to look at the pictures. --Greg |
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Jun 29 2011, 02:26 AM
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#275
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Senior Member Group: Members Posts: 2079 Joined: 13-February 10 From: Ontario Member No.: 5221 |
The wording of the 2nd option "No, I am just interested in seeing more images" seems like we're not voting against getting new images if the 1st option wins, it's just an 'extra' thing.
So we're win-win either way. |
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Jun 29 2011, 04:02 AM
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#276
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
Beware, though; it's not a secret ballot. Welcome to the world of Facebook . . .
--Greg |
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Jun 29 2011, 08:13 AM
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#277
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Newbie Group: Members Posts: 12 Joined: 2-September 08 From: Bad Gandersheim, Germany Member No.: 4327 |
The wording of the 2nd option "No, I am justinterested in seeing more images" seems like we're not voting against getting new images if the 1st option wins, it's just an 'extra' thing. Please don't read too much into this! The guy who updates the Framing Camera page on facebook is Spanish, so not a native English speaker. After I mentioned to him what you had said, he said "oops". Basically, the options should be, you want the Q&A, or only images. Also, on a very much related note, can someone please authorise the new user pablogm1024... Once he is authorised, and we get a positive vote for the Q&A, he can do it here on the forum. |
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Jun 29 2011, 09:10 AM
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#278
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
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Jun 29 2011, 04:11 PM
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#279
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
The simulated Vesta shape-file has made it into 'Eyes...'
http://twitpic.com/5ia7dv/full Cunning combo of low-res poly model, and a normal map derived from the high res shape file (which had >700,000 polys!!) This should get replaced over time as the science team produce new shape files. |
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Jun 29 2011, 04:43 PM
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#280
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I thought about asking this before, now that it's quite obvious Vesta is in reality very lumpy I guess it doesn't hurt - why did their simulated shape model assume such low crater relief? Shouldn't craters be expected to look more bowl-shaped on a body with relatively low gravity?
-------------------- |
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Jun 29 2011, 04:56 PM
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#281
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Solar System Cartographer Group: Members Posts: 10146 Joined: 5-April 05 From: Canada Member No.: 227 |
Right, it's a more lunar-like depth/diameter ratio. But I don't think the purpose was a realistic depiction of the surface, it was probably just to add a spacy-looking texture.
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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Jun 29 2011, 04:59 PM
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#282
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Also, on a very much related note, can someone please authorise the new user pablogm1024... Once he is authorised, and we get a positive vote for the Q&A, he can do it here on the forum. Done, and sounds great! Sorry, we got a bit behind on the new user approval process. -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jun 29 2011, 09:05 PM
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#283
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Junior Member Group: Members Posts: 50 Joined: 27-June 11 From: Katlenburg-Lindau, Lower Saxony, Germany Member No.: 6038 |
Done, and sounds great! Sorry, we got a bit behind on the new user approval process. Thank you for the approval. The Q&A is now open under http://www.unmannedspaceflight.com/index.php?showtopic=6998 . Please forgive us (and help us) if our inexperience makes us violate some etiquette rules. Pablo Gutiérrez-Marqués Dawn Framing Camera Operations Manager -------------------- |
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Jun 29 2011, 09:43 PM
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#284
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Junior Member Group: Members Posts: 21 Joined: 4-November 10 Member No.: 5509 |
More images Friday according to the Dawn Mission Facebook page
Raj Pillai Any new pics after June 20th of Vesta?.. Yesterday at 9:15am · Like · David Braunstein (Please)^100!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 18 hours ago · Like Dawn Mission Friday!! 13 hours ago · Like · 1 person David Braunstein Yeah^100 7 hours ago · Like Raj Pillai I have no idea who is talking about what.. but am I to assume Friday we will get to see newer pics of Vesta?.. 3 hours ago · Like Write a comment... |
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Jul 1 2011, 01:27 AM
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#285
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
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