Vesta departure and journey to Ceres, A new phase of Dawn adventure |
Vesta departure and journey to Ceres, A new phase of Dawn adventure |
Sep 17 2012, 03:02 PM
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#31
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Member Group: Members Posts: 140 Joined: 20-November 07 Member No.: 3967 |
Soon as Phil gives the okay, I'll get started on a fold-up map of the thing.
Phil . . . ? |
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Sep 18 2012, 05:43 PM
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#32
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Update:
Last engine stop, yesterday, lasted about 9 hours based on speed data; as consequence, Hill sphere exit date shifted slightly ahead (Sep,23 around 20 UTC). PS: in the last posts, the two left plots (long term range/speed and Energy trends) weren't updated correctly, I'm sorry for this! -------------------- I always think before posting! - Marco -
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Sep 21 2012, 11:31 AM
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#33
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Sep 21 2012, 04:03 PM
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#34
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
"Phil . . . ? "
OK Chuck - here I have taken those two polar maps of topography and reprojected them into simple cylindrical. There are a few very minor errors in this composite but nothing to worry you in your work. It should be easy to match this with published gridded maps to get crater names, lat and long etc. (a grid is faintly visible on this, from the originals). But this gives you the topography to locate your ridge lines etc. PS - apparent mismatch along the equator is caused by different illumination of the rendered shaded relief between the two halves. 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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Sep 24 2012, 10:55 PM
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#35
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
This is my final update plot of Vesta departure:
Dawn is definitively out of Vesta sphere of influence, exact time depends on which Hill sphere radius you assume. In fact, while classic formula is based on average distance of the body from Sun, others reccomend to use pericenter distance, which gives a smaller radius; moreover, I calculated also the present Hill radius based on current heliocentric distance. Here below my results, based on interpolation of Mystic simulator distances (sorry for improper use of "code" format but table format appears problematic otherwise!): CODE Method (Sun distance) Distance from Vesta date/time UTC I tend to prephere last one, which occurrred few hours ago, probably during the weekly engine shutdown...
Periastron 113180 km Sep, 22 12:40 Average 124180 km Sep, 23 18:52 Current 134750 km Sep, 24 22:30 -------------------- I always think before posting! - Marco -
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Nov 3 2013, 05:57 PM
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#36
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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Dec 7 2013, 03:39 AM
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#37
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
New info about Ceres plan, with details on hybrid control mode for low-altitude mapping orbit:
http://dawn.jpl.nasa.gov/feature_stories/D..._Dance_Card.asp |
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Dec 1 2014, 09:51 PM
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#38
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
According to the November 2014 Dawn Journal, today is the day that Dawn takes its first resolved photos of Ceres, nine pixels across. These are being taken mainly to calibrate the camera. Still a couple of months to go before they start getting the really good stuff.
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Dec 1 2014, 11:34 PM
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#39
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
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Dec 5 2014, 03:33 PM
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#40
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the Max Planck Institute has a release (i n German) with the first, distant images of Ceres:
http://www.mps.mpg.de/3867888/PM_2014_12_0..._eine_neue_Welt |
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Dec 5 2014, 03:41 PM
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#41
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
Here is a link to the picture on the Dawn web site: Dawn snaps Ceres
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Dec 5 2014, 07:25 PM
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#42
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Junior Member Group: Members Posts: 31 Joined: 3-August 14 From: Germany Member No.: 7229 |
the Max Planck Institute has a release (i n German) with the first, distant images of Ceres: From the Max Planck release: "up to today, the sharpest images of Ceres were acquired by HST. Starting end of January 2015, the Framinc Camera images will match and exceed that resolution. From that moment on, we'll enter a new Land." -------------------- space scout
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Dec 6 2014, 10:51 AM
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#43
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Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
Without a doubt, Ceres is significantly larger than Vesta.
In three or four weeks should start to reveal the first surface details. -------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Dec 6 2014, 12:05 PM
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#44
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Junior Member Group: Members Posts: 95 Joined: 5-September 07 Member No.: 3662 |
This is exciting! Can't wait to see Ceres close up. Almost looks like albedo differences in the photo, but could just be phase effects.
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Dec 6 2014, 12:45 PM
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#45
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
Exciting... but in a bittersweet way. This finishes the initial reconnaissance of the rocky terrestrial worlds in our local neighbourhood. If we want fresh terra incognita after this we have to go way, way out to the solar system's frigid fringes.
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