Dawn approaches Ceres, From opnav images to first orbit |
Dawn approaches Ceres, From opnav images to first orbit |
Jan 12 2015, 12:10 AM
Post
#1
|
||
Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
On Tuesday (two days from now, for visitors from the future), the first optical navigation image will be taken... hopefully we'll have it in our hands soon after that. So it's time for a new topic. Over the next few months we'll have progressively closer images and full orbit characterization sequences, no doubt including multispectral image sets.
A new world... This is a bit of reprocessing I have been doing with the Hubble images from a few years ago. 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) |
|
|
||
Jan 14 2015, 10:57 PM
Post
#2
|
|
Senior Member Group: Members Posts: 2105 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Pretty sure it was like that for Vesta too; thrusting takes a priority, since it can't point at Ceres and keep on trajectory at the same time. Dawn isn't Voyager, so no scan platform.
|
|
|
Jan 15 2015, 12:26 AM
Post
#3
|
|
Member Group: Members Posts: 207 Joined: 6-March 07 From: houston, texas Member No.: 1828 |
Pretty sure it was like that for Vesta too; thrusting takes a priority, since it can't point at Ceres and keep on trajectory at the same time. Dawn isn't Voyager, so no scan platform. Thats correct. The cadence of observations is that a set is taken for a hour or so on approach every 1 to 2 weeks, depending on the distance. >95% of mission time is spent ion thrusting and it can't point at ceres. There are a variety of exposures and filters and such during each sequence and it takes a few days to select the optimal exposure, remove camera artifacts, etc to release to the public. No worries, the team is eager to show the world what the target looks like! Once they settle into mapping phase, there will likely be a photo of the day release just as there was for Vesta. -------------------- Dr. Paul Schenk, Lunar and Planetary Institute, Houston TX
http://stereomoons.blogspot.com; http://www.youtube.com/galsat400; http://www.lpi.usra.edu/science/schenk/ |
|
|
Jan 15 2015, 12:07 PM
Post
#4
|
|
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Once they settle into mapping phase, there will likely be a photo of the day release just as there was for Vesta. Close but not quite, due to the flywheel problem Dawn will have to use thruster power to reorient to send back to Earth. To conserve fuel Dawn will be spending longer time taking images and do measurements, therefore we will be getting new images every second day at best. |
|
|
Jan 15 2015, 12:13 PM
Post
#5
|
|
Member Group: Members Posts: 207 Joined: 6-March 07 From: houston, texas Member No.: 1828 |
Close but not quite, due to the flywheel problem Dawn will have to use thruster power to reorient to send back to Earth. To conserve fuel Dawn will be spending longer time taking images and do measurements, therefore we will be getting new images every second day at best. yes, but by then there will be lots more archived to chose from to post on the Pic-o-the-Day site. Each orbit returns dozens of frames. The number will vary depending on altitude and which mapping phase we are in, of course, but I don't have those numbers. -------------------- Dr. Paul Schenk, Lunar and Planetary Institute, Houston TX
http://stereomoons.blogspot.com; http://www.youtube.com/galsat400; http://www.lpi.usra.edu/science/schenk/ |
|
|
Lo-Fi Version | Time is now: 20th September 2024 - 10:39 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |