New Horizons: Approach Phase, OpsNav - 25 January 15 to 28 June 15 |
New Horizons: Approach Phase, OpsNav - 25 January 15 to 28 June 15 |
Feb 3 2015, 06:45 PM
Post
#1
|
|
Member Group: Members Posts: 105 Joined: 27-August 05 Member No.: 479 |
|
|
|
Feb 4 2015, 09:22 PM
Post
#2
|
|
Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
The LORRI image release for today is up at :
http://pluto.jhuapl.edu/News-Center/News-A...p?page=20150204 |
|
|
May 13 2015, 05:19 PM
Post
#3
|
|
Newbie Group: Members Posts: 18 Joined: 4-January 07 Member No.: 1558 |
Is the error build up due to the increasing apparent diameter of the system as NH gets closer between frames?
|
|
|
May 13 2015, 10:33 PM
Post
#4
|
|
Member Group: Members Posts: 706 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
All the obvious geometrical effects are included in the predictions of the positions of the objects in the images- this is all done with SPICE which knows how to make those calculations. The offsets are mostly because the spacecraft orientation is only determined to within a certain precision, that is bigger than the resolution of the camera, so you can't predict the exact pixel objects will land on from the spacecraft pointing data alone. In fact the first thing we do when analyzing the images is to determine accurate pointing by comparing the star positions to a catalog. I'm not sure why the error would show systematic drifts with time, but it might be just coincidence.
John |
|
|
Lo-Fi Version | Time is now: 21st September 2024 - 03:48 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. |