Pluto Surface Observations 1: NH Post-Encounter Phase, 1 Aug 2015- 10 Oct 2015 |
Pluto Surface Observations 1: NH Post-Encounter Phase, 1 Aug 2015- 10 Oct 2015 |
Aug 1 2015, 05:53 PM
Post
#1
|
|
Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic will contain images & discussion of same as they arrive during the extended download period. Similar threads will be opened in coming months as required as acquired data & discussion proceeds.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
Aug 10 2015, 07:00 PM
Post
#2
|
|||
Junior Member Group: Members Posts: 82 Joined: 13-July 15 Member No.: 7579 |
With the use of metadata of LORRI frames I clarify trajectory of New Horizons (error is about 0.000002 on distancies to Pluto at snapshots momens). After that it made possible to simulate all frames with subpixel accuracy. Here for example, two of these frames:
As a bonus Pluto radius was determined: R=240.89 km * u, where 'u' is LORRI pixel size in microradians. If we assume that the under-Charon avarage point has longitude 0°, then the map of Pluto (for example http://www.unmannedspaceflight.com/index.p...t&id=37374) is offset by 1.6 ° to the east. So I had to make such correction to map, that the image consistent with LORRI frames. Nevertheless, clear to see that there are still quite a strong distortion in the map. |
||
|
|||
Aug 10 2015, 07:25 PM
Post
#3
|
|
IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
With the use of metadata of LORRI frames I clarify trajectory of New Horizons (error is about 0.000002 on the current distance to Pluto). After that it made possible to simulate all frames with subpixel accuracy. Here for example, one of these frames: As a bonus Pluto radius was determined: R=240.89 km * u, where 'u' is LORRI pixel size in microradians. This translates to 1193.6 km, consistent with the 1185 +/- km measured by the NH team a day before the flyby (interestingly, I got a value of 1194 km km back then). Regarding NH's trajectory, if I remember correctly the flyby didn't occur at exactly the planned time (off by some seconds but well within the required accuracy) and this makes it more tricky to use the metadata to accurately determine the viewing geometry (especially in the hi-res images) until an updated trajectory (SPICE kernels) becomes avvailable. |
|
|
Lo-Fi Version | Time is now: 27th September 2024 - 01:49 AM |
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. |