Vesta departure and journey to Ceres, A new phase of Dawn adventure |
Vesta departure and journey to Ceres, A new phase of Dawn adventure |
Aug 26 2012, 05:45 AM
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
As suggested by "TheAnt", is time to start a new thread!
Due to lack of updates from "Mystic simulator", I asked directly to Marc Rayman for an update and he kindly sent me the following "unofficial" plots, showing evolution of distance, radial velocity and sub-spacecraft latitude (radius trend is splitted in two plots with different scales due to huge variation of the distance): I did not publish them immediately because I wanted to integrate them with my previous plots but, due to the lack of time in last week, I decided to post them directly with only minimal changes. As you can see, third engine stop occurred on Aug 8-18 at almost 2300km above Vesta while next (final) one is just started and, as reported by Marc in his latest journal, will be used to map North polar regions from 6000km distance. Thereafter thrust will resume and, based on plots, on Sept 5 total speed will overcome escape velocity (almost 45 m/s), so total energy balance will be zero; definitive exit from Vesta Hill sphere should occur after 20 days but consider that the times could slighty change due to orbit refinement and thrust plan changes. -------------------- I always think before posting! - Marco -
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Jan 4 2015, 02:00 AM
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
While we wait for DAWN to snap more approach images of Ceres, I put the Dec 2014 Framing Camera image (PIA19049) through the deconvolution process. I hate going above 10x on an image, since we are pushing around noise, point spread functions of the camera, and other artifacts (such as working from a JPEG). But I ran this baby up to the max: 30x (!)
Don't try to see craters or such things other than a bright area on the right side (and a slightly darker 'depression' on the lower right --to be named the pdp8e abyss ). Most of the image is the deconvolver 'hallucinating' about what it thinks it sees... but it is fun! The size difference (not resolution) is about what Ceres would appear at roughly 25,000 miles away -------------------- CLA CLL
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