Cassini Io revisited |
Cassini Io revisited |
Nov 9 2009, 10:25 PM
Post
#1
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
While playing around with some old Cassini data, specifically one used in PIA02588 release I noticed something I haven't seen publicly mentioned before (not that I've been paying too much attention!). Namely, Pele's eruption hotspot is visible in ISS infrared frames, similarly to the very cool effect New Horizons saw. It's not as spectacular being from much further out, but still it's pretty cool. Here's a montage showing a few different processings of data taken January 2nd, 2001 00:22 UTC from a distance of 10.29 million km, magnified 3x. Click image below to magnify:
As shown above, the hotspot is definitely not an artifact as it's seen in all infrared filters with decreasing brightness toward shorter wavelengths. Here are the two standalone animated gifs featuring the best UV3 frames captured, magnified 2x. Tvashtar and Pele plumes visible. Click to load: -------------------- |
|
|
Nov 9 2009, 10:48 PM
Post
#2
|
|
Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Yep, Pele's hotspot as well as other near-by hotspots (like Wayland, Pillan, and Reiden) have definitely been noted in eclipse data from Cassini at least:
http://gishbar.blogspot.com/2009/02/lpsc-2...-estimates.html -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
|
|
Nov 9 2009, 11:03 PM
Post
#3
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Neat find, Gordan!
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Nov 10 2009, 08:46 AM
Post
#4
|
||
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I forgot all about those eclipse observations and that cool two-color movie, which is ironic because I was looking for good sunlit shots before and after eclipse in those very same sequences.
Still, those shots were taken completely in the darkness and the ones above are exposure-optimized for sunlit surfaces. Now that you mention it, there are 3 RGB sets with 12 sec exposure, binned 2x2 and corresponding clear frames. The color data is next to useless, especially the blue/UV filters, here's what I could coax out from one of the sets: RGB color overlaid on a clear frame. Magnified 4x. The color data was processed to oblivion to remove noise so it's only qualitative here, but I like how Pele's glow is distinctly red. I'm not sure if it's the noise or if there really are some greenish aurora wisps around that area. -------------------- |
|
|
||
Nov 10 2009, 09:17 AM
Post
#5
|
|
Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
i liked those eruptions so much a made a "night map" for them
[attachment=19609:io1.jpg] [attachment=19610:io2.jpg] [attachment=19611:io3.jpg] |
|
|
Aug 23 2010, 05:34 PM
Post
#6
|
||
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
A couple of plumes seen at the terminator, taken on January 1st and 5th, 2001. CB2+BL1 false color. The glow on Io's dark side is light scattered from the Jupiter backdrop. The sub-spacecraft points appear to be very similar.
-------------------- |
|
|
||
Lo-Fi Version | Time is now: 22nd September 2024 - 02:55 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. |