Rev 149 - May 30-Jun 29, 2011 - Helene, Distant Iapetus, mutual events |
Rev 149 - May 30-Jun 29, 2011 - Helene, Distant Iapetus, mutual events |
May 30 2011, 08:02 PM
Post
#1
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Latest Looking ahead article (Rev149: May 30 - Jun 29) is up.
- Iapetus observations - Titan-Rhea mutual event - close (6,968 km) flyby of Helene - Titan flyby Interesting stuff. |
|
|
Jun 6 2011, 05:49 PM
Post
#2
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
|
|
Jun 7 2011, 02:15 AM
Post
#3
|
|
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
Jun 8 2011, 02:37 PM
Post
#4
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Lots of Iapetus images have been posted on Cassini's raw image page here.
|
|
|
Jun 8 2011, 07:27 PM
Post
#5
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
|
|
Jun 8 2011, 08:39 PM
Post
#6
|
|
Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Much appreciated Gordan. It's great to see the old walnut moon again, and from a new angle.
|
|
|
Jun 9 2011, 02:48 AM
Post
#7
|
|
Senior Member Group: Members Posts: 2089 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Has any new terrain been revealed in this view? Obviously it isn't the best resolution, but just out of curiosity.
|
|
|
Jun 9 2011, 04:43 PM
Post
#8
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Imagine if you could rock Iapetus back and forth in your hand... well, this is the next best thing:
http://youtu.be/qY2DMMak5L8?hd=1 -------------------- |
|
|
Jun 9 2011, 05:05 PM
Post
#9
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
I downloaded all the flyby images this morning with the idea of assembling an animation if I find the time, but I think I'll just enjoy what has been done already.
|
|
|
Jun 11 2011, 10:21 PM
Post
#10
|
||
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Another random snapshot from the Iapetus sequence, June 9th, IR1/GRN/UV3:
"Snowman" craters coming into view at the limb to the left. -------------------- |
|
|
||
Jun 12 2011, 06:55 AM
Post
#11
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Great as per usual, Gordan.
I've updated my Iapetus 'bouncy' flyby movie, which is derived from a sequence of 203 frames; tweened to 406: http://youtu.be/qY2DMMak5L8?hd=1 -------------------- |
|
|
Jun 12 2011, 08:22 AM
Post
#12
|
|
Member Group: Members Posts: 146 Joined: 23-August 06 From: Vriezenveen, Netherlands Member No.: 1067 |
as for Iapetus, my only wish would be to have high-res image - in daylight - of the snowman craters..
|
|
|
Jun 12 2011, 05:46 PM
Post
#13
|
|
Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
Its sad we don't get anymore closer flybys.
I'll take anything we can get. Ian amazing work! |
|
|
Jun 14 2011, 02:13 AM
Post
#14
|
||
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Methanovision composite [MT3,MT2,CB2] with an overlaid CB2 image to enhance cloud detail taken on June 11, 2011:
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
||
Jun 14 2011, 08:44 AM
Post
#15
|
|
Junior Member Group: Members Posts: 60 Joined: 1-August 06 From: Vienna, Austria Member No.: 1002 |
Mike, another fantastic composition - such beauty! Keep up the great work!
|
|
|
Jun 16 2011, 12:52 AM
Post
#16
|
||
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Two frame blink animation of two MethanoVision [MT3,MT2,CB2] composites from June 13, 2011. Some neat storm structures. It is subtle, but a counterclockwise motion can be seen in the left swirl looking at the inner cloud motions.
(Individual frames and processing details on flickr) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
||
Jun 17 2011, 01:59 AM
Post
#17
|
||
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
June 14, 2011 image. Not this might be similar (1 or two rotations?) to the view seen above. Note a new upwelling to the W of the bright little (cute!) cloud swirl.
If so, that makes three seperate upwellings in a line. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
||
Jun 17 2011, 01:47 PM
Post
#18
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I can haz mutual event?
http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=238919 http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=238924 http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=238928 http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=238938 -------------------- |
|
|
Jun 17 2011, 02:39 PM
Post
#19
|
|
Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Oo, now they're getting all fancy with their camera angles. I assume that they did that technically to take advantage of the diagonal of their square FOV being 1.4 times longer than the path straight across...but it doesn't hurt that it looks cool!!
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
Jun 17 2011, 02:55 PM
Post
#20
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
|
|
|
Jun 17 2011, 05:08 PM
Post
#21
|
|
Member Group: Members Posts: 753 Joined: 23-October 04 From: Greensboro, NC USA Member No.: 103 |
I had lunch with Carolyn Porco a couple of weeks ago and asked her about these "tourist" photos - i.e., was there valuable scientific data being obtained or was it sightseeing? She said that she actually has quite a fondness for these kinds of beautiful images. They add so much to the perception of the Saturn system as a "place," and so they are planned even though there is really no scientific data to be gleaned from them. I suspect that the positive PR impact gained from these sightseeing photos certainly is worth the hydrazine to aim the camera.
-------------------- Jonathan Ward
Manning the LCC at http://www.apollolaunchcontrol.com |
|
|
Jun 17 2011, 05:50 PM
Post
#22
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
|
|
Jun 17 2011, 05:56 PM
Post
#23
|
|
Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
....that is drop-dead gorgeous, Gordan!!!
-------------------- 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.
|
|
|
Jun 17 2011, 08:27 PM
Post
#24
|
|
Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
SUH-WEET!
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
|
|
Jun 18 2011, 02:40 PM
Post
#25
|
|
Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Until someone makes an animation...
Well, not exactly an animation but a 15 second movie based on the Cassini images. Rhea_Titan.wmv ( 854.28K ) Number of downloads: 847 or on YouTube. Enjoy |
|
|
Jun 18 2011, 03:34 PM
Post
#26
|
|
Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
Astro0, very moving
-------------------- 'She drove until the wheels fell off...'
|
|
|
Jun 18 2011, 08:41 PM
Post
#27
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Very nice and seamless, Astro0!
-------------------- |
|
|
Jun 20 2011, 12:10 PM
Post
#28
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
-------------------- |
|
|
Jun 20 2011, 12:12 PM
Post
#29
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Wow, they totally NAILED it this time!
-------------------- |
|
|
Jun 20 2011, 12:15 PM
Post
#30
|
|
Member Group: Members Posts: 315 Joined: 1-October 06 Member No.: 1206 |
Holy smokes! Downslope flow features?
P |
|
|
Jun 20 2011, 12:30 PM
Post
#31
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
-------------------- |
|
|
Jun 20 2011, 12:47 PM
Post
#32
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
-------------------- |
|
|
Jun 20 2011, 12:48 PM
Post
#33
|
|
Junior Member Group: Members Posts: 45 Joined: 11-March 05 From: Canada Member No.: 188 |
Wow. These tiny moons never fail to bewilder.
|
|
|
Jun 20 2011, 12:50 PM
Post
#34
|
|
Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
... that's a pretty astonishing little body. The solar system seems to have an endless supply of surprises.
I guess this is the face that launched a thousand [space]ships. Or a thousand excited exclamations of a word that sounds like ship. |
|
|
Jun 20 2011, 12:56 PM
Post
#35
|
|||
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
RGB composites, one in natural-ish contrast and another contrast-enhanced:
The illuminated hemisphere seems to be the same one as the saturnshine-lit one in this image. I think this is my favorite of the small Saturnian rocks. -------------------- |
||
|
|||
Jun 20 2011, 01:16 PM
Post
#36
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I'm posting a link to my Helene 'mini-atlas' for reference:
http://www.flickr.com/photos/10795027@N08/...57624830467026/ -------------------- |
|
|
Jun 20 2011, 01:46 PM
Post
#37
|
|
IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Wow. Yet another object in the Saturn system that qualifies as one of the strangest ones I've ever seen. Maybe it's becoming necessary to redefine what strange means in this context because the 'stereotype' small and irregular asteroids/moons with nothing but craters seem to be really rare.
I get the impression that we may be looking at erosion features but I'm not sure how something like that might work. Congratulations to the Cassini team for perfect pointing this time. |
|
|
Jun 20 2011, 01:52 PM
Post
#38
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Excellent images! Ski slopes on the Saturn's moon!
Surface of Helene is really extraordinary and it looks, that it is very young. -------------------- |
|
|
Jun 20 2011, 02:33 PM
Post
#39
|
|
Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
|
|
|
Jun 20 2011, 02:42 PM
Post
#40
|
|
Solar System Cartographer Group: Members Posts: 10183 Joined: 5-April 05 From: Canada Member No.: 227 |
It looks as if a surface crust is eroding away... very odd.
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 PD: 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) |
|
|
Jun 20 2011, 03:12 PM
Post
#41
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
-------------------- |
|
|
Jun 20 2011, 03:35 PM
Post
#42
|
|
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Here's a 'bouncy' flyby movie: Wow. When the thin crescent slowly reveals itself to be an object coming out of the gloom....wow. That is beautiful. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
Jun 20 2011, 03:46 PM
Post
#43
|
|
Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Great work Ian. I know how time consuming that can be.
Is that series cycling through images taken with different filters? -------------------- If Occam had heard my theory, things would be very different now.
|
|
|
Jun 20 2011, 03:48 PM
Post
#44
|
|
Solar System Cartographer Group: Members Posts: 10183 Joined: 5-April 05 From: Canada Member No.: 227 |
Great work, everyone.
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 PD: 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) |
|
|
Jun 20 2011, 04:01 PM
Post
#45
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
It looks as if a surface crust is eroding away... very odd. Calypso also appears to have surface features resembling this. The resolution there is low, but we didn't notice these on Helene in lower resolution imagery, either. -------------------- |
|
|
Jun 20 2011, 04:38 PM
Post
#46
|
|
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
To me, it looks like ring material is coating up and loading onto the surface. Then at some point, it releases and makes an avalanche that fills into the basin.
Trying to get a sense of scale, this is about the size of a big avalanche chute on Earth, but I imagine the whole motion being much gentler due to the really low gravity. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
Jun 20 2011, 04:47 PM
Post
#47
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
To me, it looks like ring material is coating up and loading onto the surface. Looking at Ian's atlas, it does seem to be the case that the leading hemisphere is smooth, while the trailing is heavily cratered. My guess would be small impacts over time causing quakes to shake material down slope. I wonder if the trailing hemisphere is spectrally redder as a consequence. -------------------- |
|
|
Jun 20 2011, 05:17 PM
Post
#48
|
|
Junior Member Group: Members Posts: 57 Joined: 22-March 09 From: West Hartford, Connecicut Member No.: 4691 |
Amazing image and interesting craters and errosion of the surface.
|
|
|
Jun 20 2011, 06:30 PM
Post
#49
|
|
Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
Awesome with a capital 'awe'
I've been looking forward to this flyby for a couple of months. I get home from work hoping to browse the raw images; and come here first to find that not only was the camera pointing inch-perfect, but the raw images have been enhanced and stacked, there's a cross-eye stereo view to enjoy, and even a flyby movie on 'You tube' Phenomenal work everybody!! I'm sure there's a little detail to be teased out courtesy of saturnshine too..... |
|
|
Jun 20 2011, 06:43 PM
Post
#50
|
|
Member Group: Members Posts: 128 Joined: 28-October 08 From: Boston, MA Member No.: 4469 |
Incredible. Thanks again and again to the Cassini team and all of the image mavens here for providing the rest of us with a seemingly endless chain of such awe inspiring moments. Longest day of the year (almost), and I have a sudden yearning for winter.
|
|
|
Jun 20 2011, 06:52 PM
Post
#51
|
|
Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
Looks kinda like a used painting sponge:
Attached image(s)
|
|
|
Jun 20 2011, 07:39 PM
Post
#52
|
|
Solar System Cartographer Group: Members Posts: 10183 Joined: 5-April 05 From: Canada Member No.: 227 |
No, that's Hyperion!
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 PD: 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) |
|
|
Jun 20 2011, 09:22 PM
Post
#53
|
|
Member Group: Members Posts: 259 Joined: 23-January 05 From: Seattle, WA Member No.: 156 |
I'd love a hi-res enough view to do a good comparison of Helene's flow features with Martian gullies.
|
|
|
Jun 20 2011, 10:07 PM
Post
#54
|
|
Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
Thanks CASSINI and UMSF image mages....
Agree with Juramike and ugordan. Think this is some ring particle loading phenomenon. Whatever.... man... is she beautiful!!!! Craig |
|
|
Jun 20 2011, 10:20 PM
Post
#55
|
|
The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Good... ***grief***...
Just got back from a day in Blackpool (bought some rock, ate some ice cream, met some daleks, as you do) and went online to see what I've missed - Look at THAT!!! I'll say it too: great work everyone who worked on these images. Just brilliant processing and "citizen science" (hate that term but it seems to have stuck... oh well...) See, DAWN team? See what happens when you release your images quickly and generously? People like those here treat them with care and admiration and use them to create works of art and wonder, which get other people buzzing like bees on crack about your mission! Stop ****ing about and let those pictures fly free!! -------------------- |
|
|
Jun 21 2011, 01:56 AM
Post
#56
|
|
Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Stu: Well said!!!!!!!!!!!!!!!!!!!!!!!!
Helene: !!! GREAT work, everyone! After seeing this, I'm beginning to wonder if Cassini herself might glaze over in a few years! -------------------- 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.
|
|
|
Jun 21 2011, 04:48 AM
Post
#57
|
||
Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
I'm just blown away by the subtlety of the light in this image - the first frame in Cassini's Helene sequence - image N00172780.
Does anyone know if the light shining at the bottom of the frame is Saturn's limb/terminator, a moon or some other feature? Is the planet part of the background? Also, with an eXtreme contrast stretch (right), Helene's body comes out of the darkness BTW, nice job everyone of the images produced so far. Cassini's own image release is here and the same from JPL here. |
|
|
||
Jun 21 2011, 05:55 AM
Post
#58
|
|
Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
Does anyone know if the light shining at the bottom of the frame is Saturn's limb/terminator, a moon or some other feature? Is the planet part of the background? Eyes on the Solar System has predicted trajectory (but not pointing) for this - and looking at the geometry, I think it's the limb of Saturn, The 'darkness' you have, is the night side of Saturn. C/A was well after that and the dark side of Saturn was no longer in the FOV. |
|
|
Jun 21 2011, 10:58 AM
Post
#59
|
|
Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
I wonder if the color changes on the surface are a grain-size phenomenon? Fine coating --> lumpy bigger grained avalanche debris
or grains on the surface slowly subliming-redepositing to get bigger grains, then getting ground down to dust during the avalanche event? (initial Fine coating --> bigger recrystallized grains --> avalanche dust). Hyperion also has the same kinda look. Anyone know if VIMS also got images? -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
Jun 21 2011, 11:16 AM
Post
#60
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Anyone know if VIMS also got images? Even if it did, the pixels would be so large you would have trouble landing one on just the darker or bright stuff. -------------------- |
|
|
Jun 21 2011, 11:30 AM
Post
#61
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"Anyone know if VIMS also got images?"
It's highly probable. VIMS worked together with ISS almost every close flyby . This was for example case of last Helene flyby and results has similarly bad alignment. -------------------- |
|
|
Jun 21 2011, 01:10 PM
Post
#62
|
|
Junior Member Group: Members Posts: 76 Joined: 19-October 05 Member No.: 532 |
|
|
|
Jun 21 2011, 01:32 PM
Post
#63
|
|
Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Anyone else reminded of Clarke's novel, A Fall of Moondust ?
|
|
|
Jun 22 2011, 02:38 PM
Post
#64
|
||
Junior Member Group: Members Posts: 33 Joined: 25-March 10 Member No.: 5281 |
Eyes on the Solar System has predicted trajectory (but not pointing) for this - and looking at the geometry, I think it's the limb of Saturn, The 'darkness' you have, is the night side of Saturn. C/A was well after that and the dark side of Saturn was no longer in the FOV. Yes, the bright patch definitely is the Saturnian limb. Coincidentally, the limb is right at the terminator too. |
|
|
||
Jun 22 2011, 03:06 PM
Post
#65
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
|
|
Jun 22 2011, 03:42 PM
Post
#66
|
|
Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
High praise for that high phase... WOW !
-------------------- 'She drove until the wheels fell off...'
|
|
|
Jun 22 2011, 04:45 PM
Post
#67
|
|
Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Stanley Kubrick would be envious.
-------------------- If Occam had heard my theory, things would be very different now.
|
|
|
Jun 22 2011, 05:53 PM
Post
#68
|
|
Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
|
|
|
Jun 27 2011, 01:24 AM
Post
#69
|
|||
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
The distant view from January essentially shows the same side of Helene, albeit illuminated from the opposite angle:
http://photojournal.jpl.nasa.gov/catalog/PIA12758 Now, the caption states that this is the trailing hemisphere, which I *think* is a mistake; the 'Eyes on the Solar System' simulation and the mini-atlas suggest that this is actually the leading hemisphere. Here are two shots from the January and June flybys side-by-side: ...and here is a rough version of the two combined, showing the entirety of the leading hemisphere: -------------------- |
||
|
|||
Jun 27 2011, 09:24 AM
Post
#70
|
|
Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Fantastic finding!
From this angle Helene looks like heart, what it is not very surprising, when one come to realize, that Helen was beautiful Troy's princess. -------------------- |
|
|
Jun 27 2011, 06:14 PM
Post
#71
|
||
Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
...and here is a rough version of the two combined, showing the entirety of the leading hemisphere: Great finding, I made another version with different hue illuminations (some distorsion in the polar regions of older image was necessary in order do better match features, probably due to slight difference in the Cassini "latitude"): What an incredible body! -------------------- I always think before posting! - Marco -
|
|
|
||
Jun 27 2011, 06:29 PM
Post
#72
|
|
Solar System Cartographer Group: Members Posts: 10183 Joined: 5-April 05 From: Canada Member No.: 227 |
Very nice, Dilo!
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 PD: 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) |
|
|
Jul 1 2011, 03:58 PM
Post
#73
|
|
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I concur with Phil: Dilo, that was a really good idea to colourise the two halves in different hues; both informative and eye-catching!
Phil, as an expert in small heavenly bodies, do you agree that this is indeed the leading hemisphere of Helene? -------------------- |
|
|
Jul 3 2011, 05:39 PM
Post
#74
|
|
Junior Member Group: Members Posts: 22 Joined: 6-March 10 From: London, Ontario, CANADA Member No.: 5247 |
Great finding, I made another version with different hue illuminations (some distorsion in the polar regions of older image was necessary in order do better match features, probably due to slight difference in the Cassini "latitude") Beautiful composite! Note that the darker surface that appears to be eroding into the lighter gullies has some relief: The darker surface is exposed mostly in the ridges and appears competent -relative to the gullies it has been around for awhile. Perhaps this implies that if the leading surface of Helene is being coated, it is not a continuous process but is instead episodic. If a `weathering' rate could be determined then a limit on the age of the last `coating' event could be estimated. -pjam -------------------- "We absolutely must leave room for doubt or there is no progress and there is no learning." -Richard P. Feynman
|
|
|
Jul 4 2011, 10:16 AM
Post
#75
|
||
Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
This flyby made me go back and take another look at the images Cassini took from last year's encounter. I decided to stack the Saturn-shine pictures, resulting in a reasonable enhancement of the facing hemisphere:
-------------------- |
|
|
||
Jul 4 2011, 10:56 AM
Post
#76
|
|
Solar System Cartographer Group: Members Posts: 10183 Joined: 5-April 05 From: Canada Member No.: 227 |
Very nice. I think that other face is the leading side as you say.
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 PD: 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) |
|
|
Feb 20 2017, 06:26 AM
Post
#77
|
|||
Member Group: Members Posts: 238 Joined: 15-January 13 Member No.: 6842 |
Just "discovered" Helene, what a peculiar-looking moon! Any idea what its surface gravity would be?
Here's my RGB composite from N00172891, N00172892, and N001728913 Enhanced saturation: A lot of work went into "massaging" the individual images into alignment, but there's still some colour fringing. -------------------- Curiosity rover panoramas: http://www.facebook.com/CuriosityRoverPanoramas
My Photosynth panoramas: http://photosynth.net/userprofilepage.aspx...;content=Synths |
||
|
|||
Feb 21 2017, 04:19 AM
Post
#78
|
|
Senior Member Group: Members Posts: 2089 Joined: 13-February 10 From: Ontario Member No.: 5221 |
007 m/s2 from Wolfram Alpha: http://www.wolframalpha.com/input/?i=helene+surface+gravity
The equation is pretty simple to calculate oneself, though: g = G * M / r2. |
|
|
Lo-Fi Version | Time is now: 4th June 2024 - 02:55 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. |