IPB
X   Site Message
(Message will auto close in 2 seconds)

Welcome Guest ( Log In | Register )

32 Pages V  < 1 2 3 4 5 > » 

Ian R
Posted on: Mar 27 2017, 09:47 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


This is my attempt at animating the nine CB3 frames taken on the 21st:

http://imgur.com/a/MqRLr
  Forum: Cassini's ongoing mission and raw images · Post Preview: #235195 · Replies: 90 · Views: 163195

Ian R
Posted on: Mar 25 2017, 02:02 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437



2017-03-20 Titan — A Double Take


2017-03-21 — Cassini Snaps Zero-Phase Titan
  Forum: Titan · Post Preview: #235165 · Replies: 166 · Views: 222433

Ian R
Posted on: Mar 14 2017, 06:04 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Looking at the PDS data for this medium-range flyby of Atlas, I realized a number of frames at the start of the sequence were taken against the backdrop of Saturn's night-side. Thanks to the faint illumination of the cloud decks with ring-shine, an extreme contrast stretch of the images reveals the moon's equatorial bulge and southern hemisphere in profile.

Attached Image


Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #235030 · Replies: 26 · Views: 47318

Ian R
Posted on: Mar 10 2017, 05:11 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


QUOTE (Phil Stooke @ Mar 9 2017, 02:08 PM) *
As you say, Ian, north is to the upper right in the first view you posted, so the partially illuminated bulge at lower left is the southern hemisphere. The other views show the northern hemisphere, not the southern. Pan has the same seasons as Saturn, and now the north is more fully illuminated.


Thanks for the correction, Phil — I've gone back and corrected my posts with the correct info. cool.gif
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234983 · Replies: 90 · Views: 163195

Ian R
Posted on: Mar 9 2017, 12:55 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Another medium range view, bore-sighted on the moon's north pole:

Attached Image


Edit: Thanks to Dr. Phil for pointing out my north/south confusion.
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234944 · Replies: 90 · Views: 163195

Ian R
Posted on: Mar 9 2017, 11:38 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Attached Image

Medium range view, showing the full extent of the Encke Division.
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234943 · Replies: 90 · Views: 163195

Ian R
Posted on: Mar 9 2017, 11:36 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Incredible new views of Pan, and its razor-thin equatorial bulge!

Attached Image

North is to the upper-right.

Attached Image

Staring face-on at the north pole.

Edit: Thanks to Dr. Phil for pointing out my north/south confusion.
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234942 · Replies: 90 · Views: 163195

Ian R
Posted on: Jan 18 2017, 05:52 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Hey there, Daphnis!

Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234187 · Replies: 90 · Views: 163195

Ian R
Posted on: Jan 6 2017, 01:06 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


The G-ring as seen by ISS on the 4th:

Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #234047 · Replies: 90 · Views: 163195

Ian R
Posted on: Jan 3 2017, 08:17 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


With the new year comes changes on Titan: just look at the size of the cloud bands girding the upper latitudes!

Attached Image
  Forum: Titan · Post Preview: #233978 · Replies: 166 · Views: 222433

Ian R
Posted on: Dec 30 2016, 04:58 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


QUOTE (ngunn @ Dec 29 2016, 10:54 PM) *
Refering to the circular feature: maybe impact should be considered too?


This feature has intrigued me for some time, ever since I spied it on a medium range shot from 2013:

Attached Image


Nicknaming it the 'Bullseye', I spotted it again on the VIMS mosaic taken during the T-114 flyby; this is a crop of an undistorted version of PIA20016:

Attached Image


Finally, here is our region of interest with the topographic map (courtesy of Ralph Lorenz, et al) lain over the ISS basemap PIA20713:

Attached Image


It would appear that the 'Bullseye' is possibly a depression, perhaps even an ancient impact crater that has degraded over time. It may also be analogous to Hotei Regio, which is suspected to be a dry lake bed, harking back to seasonal conditions that favored temperate latitudes. Who knows? cool.gif

  Forum: Titan · Post Preview: #233945 · Replies: 166 · Views: 222433

Ian R
Posted on: Dec 28 2016, 04:06 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Very neat trick, J. I wish I had thought of that!

Conversely, stacking the frames brings out subtle details in the shorelines of the lakes and within the bright evaporite:

Attached Image
  Forum: Titan · Post Preview: #233913 · Replies: 166 · Views: 222433

Ian R
Posted on: Dec 22 2016, 08:28 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


This two-frame mosaic from December 20th appears to show a large wisp of cloud in the vicinity of the 'kissing lakes', aka Abaya Lacus:

Attached Image
  Forum: Titan · Post Preview: #233883 · Replies: 166 · Views: 222433

Ian R
Posted on: Dec 6 2016, 01:38 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Now it looks like we can see clouds on the border of Saturn's north polar region (NPR) casting shadows!

Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233626 · Replies: 90 · Views: 163195

Ian R
Posted on: Dec 5 2016, 10:54 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Cassini got a good look at Enceladus just a couple of days before embarking on the ring-dive orbits:


2016-11-27 --- ENCELADUS QUATRO UNCROPPED


2016-11-27 --- ENCELADUS QUATRO
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233618 · Replies: 90 · Views: 163195

Ian R
Posted on: Nov 14 2016, 05:27 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


The Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS), is a new instrument designed by Princeton to observe exoplanets, and works in conjunction with the Subaru Telescope in Hawaii. It has also returned a quite astonishing image of Neptune:

http://www.universetoday.com/131903/prince...d-nearby-stars/

  Forum: Uranus and Neptune · Post Preview: #233395 · Replies: 81 · Views: 234185

Ian R
Posted on: Nov 13 2016, 05:23 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Tethys from 367,700 kilometers (228,500 miles), in an image produced with NAC images filtered through IR, Green, Clear, and UV.

Attached Image


For comparison, here is Jason's Celestia preview screengrab:

http://www.ciclops.org/media/me/2016/8436_20209_1.jpg
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233390 · Replies: 0 · Views: 3247

Ian R
Posted on: Nov 13 2016, 05:18 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


QUOTE (ngunn @ Nov 5 2016, 10:55 PM) *
Is there a published map showing the names of bays and headlands in Titan's lakes and seas? If so I've missed it so far.


There is indeed such a map, courtesy of the USGS: http://planetarynames.wr.usgs.gov/images/t...rthpole_new.pdf

A full set of maps can be found here: http://planetarynames.wr.usgs.gov/Page/TITAN/target
  Forum: Titan · Post Preview: #233389 · Replies: 166 · Views: 222433

Ian R
Posted on: Nov 5 2016, 12:15 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Way to totally trump me, Jason! laugh.gif Awesome work, sir. And is that hazes and/or fog I see hovering over Ladoga Lacus?
  Forum: Titan · Post Preview: #233326 · Replies: 166 · Views: 222433

Ian R
Posted on: Nov 4 2016, 04:30 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


I've finished the mosaic (Hurrah!):

https://www.amazon.co.uk/clouddrive/share/o...share_link_copy

Only three moons are visible, as far as I'm able to ascertain: Epimetheus (just above the right ansa, near Saturn); and Atlas and Prometheus (at the tip of the right ansa). Pan is too faint to be detectable, and Janus must be just out of frame.

Attached Image

Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233319 · Replies: 9 · Views: 13540

Ian R
Posted on: Nov 3 2016, 10:31 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Nice discovery Phil, and sad news about Ewen Whitaker.

How is the second edition of your Lunar Atlas coming along?
  Forum: LRO & LCROSS · Post Preview: #233309 · Replies: 475 · Views: 747513

Ian R
Posted on: Nov 3 2016, 10:01 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Thanks fellas! smile.gif I'm endlessly fascinated by Titan, so I'll no doubt continue to cook up image products even after Cassini has plunged into Saturn (the PDS data is so much nicer to work with).

And this is a stack of ten ratioed frames:


2016-10-30 Titan STACK of TEN
  Forum: Titan · Post Preview: #233308 · Replies: 166 · Views: 222433

Ian R
Posted on: Nov 2 2016, 11:50 AM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


I've processed 36 frames of Titan taken over a period of three hours; numerous clouds are seen forming and dissipating

http://imgur.com/a/i5VS6
  Forum: Titan · Post Preview: #233287 · Replies: 166 · Views: 222433

Ian R
Posted on: Oct 31 2016, 09:01 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Getting there .....

http://s21.postimg.org/u091ixct1/Glutton_Mosaic_WIP.jpg
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233267 · Replies: 9 · Views: 13540

Ian R
Posted on: Oct 30 2016, 01:59 PM


Lord Of The Uranian Rings
***

Group: Members
Posts: 798
Joined: 18-July 05
From: Plymouth, UK
Member No.: 437


Thanks Jase! smile.gif

Good question about the non-visibility of the rings draped by Saturn's shadow. Any infill light from reflected ringshine on the night side of the planet must indeed have *some* effect, but these compressed JPEGs effectively snuff out any such marginal signal, I reckon.

Just to check, I stacked the four available raw frames for this footprint and got nada:

Attached Image
  Forum: Cassini's ongoing mission and raw images · Post Preview: #233246 · Replies: 9 · Views: 13540

32 Pages V  < 1 2 3 4 5 > » 

New Posts  New Replies
No New Posts  No New Replies
Hot topic  Hot Topic (New)
No new  Hot Topic (No New)
Poll  Poll (New)
No new votes  Poll (No New)
Closed  Locked Topic
Moved  Moved Topic
 

RSS Lo-Fi Version Time is now: 17th December 2024 - 03:22 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and 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.