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Dawn Survey Orbit Phase, First orbital phase
Paolo
post Jul 17 2011, 09:09 AM
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I think it's time we start a new thread
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dilo
post Jul 28 2011, 07:43 AM
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First complete orbit is now almost accomplished (Dawn hasn't been using engines in the last 5 days).
During orbit, the speed and distance were constant; such a circular orbit is possible only if we assume that "distance from Vesta" declared in the simulator is measured from asteroid's surface (otherwise, speed should be significantly higher). I updated plots, using an average Vesta radius of 266km and assuming that also final survey orbit height will be 2700 km from surface:

Attached Image

Meanwhile, look to last spectacular "family portrait" from simulator:
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kap
post Jul 28 2011, 06:25 PM
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QUOTE (dilo @ Jul 28 2011, 12:43 AM) *

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I'm still a newb at this, is r on the left hand chart the orbital radius?

Thanks,
-kap
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Greg Hullender
post Jul 29 2011, 02:19 AM
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QUOTE (kap @ Jul 28 2011, 10:25 AM) *
I'm still a newb at this, is r on the left hand chart the orbital radius?

It's the distance from Dawn to the center of Vesta. When Dawn is in a circular orbit, it'll be the orbital radius. Part of the point is trying to determine when that happens.

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Posts in this topic
- Paolo   Dawn Survey Orbit Phase   Jul 17 2011, 09:09 AM
- - Phil Stooke   "it would be interesting to see a south polar...   Jul 25 2011, 01:45 PM
- - alan   Next Monday on NASA TV: QUOTE August 1, Monday 2...   Jul 25 2011, 04:37 PM
- - elakdawalla   Goody goody   Jul 25 2011, 06:29 PM
- - stewjack   RE: August 1, Monday 2 p.m. - NASA Science News C...   Jul 25 2011, 07:08 PM
- - Explorer1   Yes, they're always on eastern time. I sincere...   Jul 25 2011, 08:24 PM
|- - pablogm1024   QUOTE (Explorer1 @ Jul 25 2011, 09:24 PM)...   Jul 26 2011, 02:23 AM
- - Phil Stooke   Very close to completed, at the least. We're ...   Jul 25 2011, 08:33 PM
- - elakdawalla   I agree with Phil -- I think (or at least hope) we...   Jul 25 2011, 08:55 PM
- - elakdawalla   QUOTE MEDIA ADVISORY: M11-157 NASA TO UNVEIL FULL...   Jul 27 2011, 04:01 PM
- - bagelverse   Does full frame mean full lighted view of Vesta, o...   Jul 27 2011, 04:49 PM
|- - pablogm1024   QUOTE (bagelverse @ Jul 27 2011, 05:49 PM...   Jul 29 2011, 12:10 AM
- - alphasam   Hi, long-term lurker Anyway I hadn't seen thi...   Jul 28 2011, 02:20 AM
- - dilo   First complete orbit is now almost accomplished (D...   Jul 28 2011, 07:43 AM
|- - kap   QUOTE (dilo @ Jul 28 2011, 12:43 AM) I...   Jul 28 2011, 06:25 PM
|- - Greg Hullender   QUOTE (kap @ Jul 28 2011, 10:25 AM) I...   Jul 29 2011, 02:19 AM
- - Gladstoner   New image! http://dawn.jpl.nasa.gov/multimedi...   Jul 29 2011, 04:28 AM
|- - ElkGroveDan   I was looking at that. Unusual dark splat on the ...   Jul 29 2011, 04:38 AM
|- - volcanopele   QUOTE (ElkGroveDan @ Jul 28 2011, 09:38 P...   Jul 29 2011, 05:58 AM
- - mchan   If I have been following this correctly, the July ...   Jul 29 2011, 05:27 AM
|- - pablogm1024   QUOTE (mchan @ Jul 29 2011, 06:27 AM) If ...   Jul 29 2011, 06:33 AM
- - Explorer1   Iapetus, eat your heart out; we have a new snowman...   Jul 29 2011, 05:48 AM
- - Hungry4info   That's one huge groove.   Jul 29 2011, 07:03 AM
|- - tanjent   QUOTE (Hungry4info @ Jul 29 2011, 03:03 P...   Jul 30 2011, 06:30 AM
- - Explorer1   I thought the caption meant dark in the same way t...   Jul 29 2011, 07:19 AM
|- - kap   QUOTE (Explorer1 @ Jul 28 2011, 11:19 PM)...   Jul 29 2011, 06:25 PM
|- - Explorer1   Wikipedia says 7 degrees to the ecliptic. Phil...   Jul 29 2011, 07:12 PM
||- - mchan   QUOTE (Explorer1 @ Jul 29 2011, 11:12 AM)...   Jul 30 2011, 01:30 AM
|- - pablogm1024   QUOTE (kap @ Jul 29 2011, 06:25 PM) Edit:...   Jul 29 2011, 10:11 PM
|- - kap   QUOTE (pablogm1024 @ Jul 29 2011, 02:11 P...   Jul 29 2011, 10:21 PM
- - belleraphon1   New Event Time NASA To Unveil Vesta Images At News...   Jul 29 2011, 10:53 AM
- - Phil Stooke   To clarify the 'dark' description... and s...   Jul 29 2011, 01:30 PM
- - Bjorn Jonsson   The latest image is interesting. The dark area to ...   Jul 29 2011, 01:36 PM
- - Phil Stooke   A comparison view to show where we are... Phil   Jul 29 2011, 02:13 PM
- - Phil Stooke   ... and a map. Very approximate and uncontrolled ...   Jul 29 2011, 03:52 PM
|- - Paolo   QUOTE (Phil Stooke @ Jul 29 2011, 05:52 P...   Jul 30 2011, 10:14 AM
- - dilo   Engines on again!   Jul 29 2011, 03:52 PM
- - Steve G   I can't help but get a sense of familiarity wi...   Jul 29 2011, 05:07 PM
- - elakdawalla   Aha, Steve G, that's what made them so strange...   Jul 29 2011, 05:47 PM
- - Hungry4info   We'll be at the asteroid long enough for its ...   Jul 29 2011, 09:22 PM
- - volcanopele   Thankfully, Vesta has a nice, clearly visible mark...   Jul 29 2011, 10:49 PM
- - elakdawalla   Yeah, I think the only big body in the solar syste...   Jul 29 2011, 10:55 PM
|- - kwp   QUOTE (elakdawalla @ Jul 29 2011, 03:55 P...   Jul 30 2011, 02:31 PM
- - antipode   Yeah, are we seeing some of Jutzi & Asphaug...   Jul 30 2011, 07:42 AM
- - Phil Stooke   Nice one! This map was made by Michael Gaffey...   Jul 30 2011, 12:31 PM
- - Paolo   the "here be dragons" map is here http:/...   Jul 30 2011, 12:41 PM
- - Steve G   Here is a magnified and sharpened look at the far ...   Jul 30 2011, 05:35 PM
- - dilo   The progressive orbit reduction through engine-con...   Jul 30 2011, 08:41 PM
- - Explorer1   Press conference starting...   Aug 1 2011, 04:01 PM
- - Phil Stooke   http://www.nasa.gov/mission_pages/dawn/new...wn201...   Aug 1 2011, 04:04 PM
- - elakdawalla   Cool rotation movie!! What a cool mini-pla...   Aug 1 2011, 04:07 PM
- - Phil Stooke   The map is at the Photojournal now. Phil   Aug 1 2011, 04:15 PM
|- - ugordan   Whoa, groovy!   Aug 1 2011, 04:25 PM
- - Explorer1   False color... interesting splashes.   Aug 1 2011, 04:27 PM
|- - ugordan   This image nicely showcases the equatorial grooves...   Aug 1 2011, 04:58 PM
- - Juramike   Well, now we know what the image release policy is...   Aug 1 2011, 04:57 PM
- - Explorer1   There will still be PDS releases, right?   Aug 1 2011, 04:58 PM
|- - ugordan   QUOTE (Explorer1 @ Aug 1 2011, 06:58 PM) ...   Aug 1 2011, 04:59 PM
- - Juramike   Press release on images presented: http://www.nas...   Aug 1 2011, 04:58 PM
- - MarkG   Anyone know where/when the recording of the press ...   Aug 1 2011, 05:12 PM
- - hendric   Missed the press conference. Is this a close-up o...   Aug 1 2011, 05:27 PM
- - volcanopele   One major thought I had coming out of the presser ...   Aug 1 2011, 05:30 PM
|- - john_s   Complicating the picture is the possibility that t...   Aug 1 2011, 05:36 PM
- - siravan   In the Enceladus case, change of the axis of rotat...   Aug 1 2011, 06:03 PM
|- - john_s   QUOTE (siravan @ Aug 1 2011, 12:03 PM) In...   Aug 1 2011, 07:34 PM
- - tasp   My first thought about the cracks was we are seein...   Aug 1 2011, 06:46 PM
- - Tayfun Öner   Here is a quick smoothing of the rotation clip. I ...   Aug 1 2011, 07:54 PM
|- - ugordan   QUOTE (Tayfun Öner @ Aug 1 2011, 09:54 PM...   Aug 1 2011, 09:22 PM
- - machi   Excellent! Beautiful rotation   Aug 1 2011, 08:30 PM
- - Phil Stooke   The color image is up on the photojournal now. Ph...   Aug 1 2011, 08:36 PM
|- - bk_2   QUOTE (Phil Stooke @ Aug 1 2011, 09:36 PM...   Aug 2 2011, 09:44 AM
- - jasedm   Composed of completely different stuff I know, but...   Aug 1 2011, 08:49 PM
- - antipode   The crater count looks low over the impact area - ...   Aug 1 2011, 09:18 PM
- - nprev   Fantastic, Tayfun!!! Man...there...   Aug 1 2011, 11:23 PM
- - elakdawalla   QUOTE (Explorer1 @ Aug 1 2011, 09:58 AM) ...   Aug 1 2011, 11:30 PM
- - volcanopele   Lol, I got to about frame28 before I noticed your ...   Aug 1 2011, 11:39 PM
- - nprev   Mrs. nprev's comment on the movie: "Huh....   Aug 2 2011, 12:40 AM
- - MarkG   What can make a series of long, straight grooves a...   Aug 2 2011, 01:04 AM
- - Phil Stooke   Despite the Dawn team wanting this to be a very pr...   Aug 2 2011, 01:45 AM
- - Gladstoner   Wow. It looks like baling wire is holding the aste...   Aug 2 2011, 01:58 AM
- - Juramike   Mashup of 3 images: full frame image coordinated t...   Aug 2 2011, 03:12 AM
- - Decepticon   Gladstoner you read my mind. I can't wait ...   Aug 2 2011, 03:17 AM
- - elakdawalla   I was excited when I first saw that too until I de...   Aug 2 2011, 03:27 AM
|- - Stefan   QUOTE (elakdawalla @ Aug 2 2011, 05:27 AM...   Aug 2 2011, 09:32 AM
- - Gladstoner   Heh, I suppose the group of blemishes can be used ...   Aug 2 2011, 04:37 AM
|- - pablogm1024   QUOTE (Gladstoner @ Aug 2 2011, 05:37 AM)...   Aug 2 2011, 06:11 AM
|- - elakdawalla   QUOTE (pablogm1024 @ Aug 1 2011, 10:11 PM...   Aug 2 2011, 01:27 PM
|- - dshaffer   QUOTE (elakdawalla @ Aug 2 2011, 09:27 AM...   Aug 2 2011, 04:27 PM
|- - algorimancer   QUOTE (dshaffer @ Aug 2 2011, 10:27 AM) ....   Aug 2 2011, 06:23 PM
- - Lewis007   A recording of the Vesta press conference can be s...   Aug 2 2011, 06:36 AM
- - Decepticon   I shall call it the "Tsiolkovskiy Artifact...   Aug 2 2011, 06:44 AM
- - Gladstoner   And the next two largest specks can be "Grima...   Aug 2 2011, 08:06 AM
- - PDP8E   Here is a little article from the AP about Vesta ...   Aug 2 2011, 01:26 PM
- - Stu   QUOTE (elakdawalla @ Aug 2 2011, 02:27 PM...   Aug 2 2011, 03:01 PM
- - Explorer1   Don't give up; they may very well change their...   Aug 2 2011, 04:18 PM
- - alan   I was hoping for some numbers (dimensions, mass, d...   Aug 2 2011, 04:25 PM
- - hendric   Any chance of showing Tayfun Oner's wonderful ...   Aug 2 2011, 05:03 PM
- - stevesliva   It's an orbital mission. Do the ones in orbit...   Aug 2 2011, 06:40 PM
- - climber   QUOTE (stevesliva @ Aug 2 2011, 08:40 PM)...   Aug 2 2011, 06:42 PM
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