Saturn's Rings To Shine As Never Before |
Saturn's Rings To Shine As Never Before |
Sep 18 2006, 07:11 PM
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#31
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Senior Member Group: Moderator Posts: 3232 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Reflection of opposition surge off the cloud tops? Edit : scratch that, the pattern is wrong. Sunlight reflected of rings onto Saturn, Dark bands are areas where light from cloud tops is blocked by A and B rings. Bright area is cut of in curve at the bottom because this area is north of equator so no sunlight reflected directly from rings Okay, I get it now. Those are the rings we are looking at against the illuminated night side of Saturn. Okay, now it makes sense. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 19 2006, 01:22 AM
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#32
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
I believe the bright spot above the E-ring in the first image and above the G-ring in the second image is the Earth
http://saturn.jpl.nasa.gov/multimedia/imag...3/W00017855.jpg http://saturn.jpl.nasa.gov/multimedia/imag...3/W00018011.jpg |
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Sep 19 2006, 01:45 AM
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#33
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Senior Member Group: Moderator Posts: 3232 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 19 2006, 03:58 AM
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#34
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Here is probably the best shot of the new "H-ring":
http://saturn.jpl.nasa.gov/multimedia/imag...3/W00017856.jpg I would agree with Alan that this ring is probably linked to Janus and Epimetheus. Ian. -------------------- |
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Sep 19 2006, 05:41 AM
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#35
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
The H ring seems much darker and less reflective than the E ring, even (or maybe especially) in this lighting. I'd think this would argue against it being a pure-ice ring. Perhaps it is formed of icy/rocky debris from impacts on Janus and Epimetheus? I guess my first impression is that it's more of a dust ring that an ice ring.
-the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Sep 19 2006, 06:47 AM
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#36
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Handful of new images posted.
This is an odd image of the E-ring. The glow above it reminds me of an aurora. Is it something associated with the spokes or just an odd internal reflection? http://saturn.jpl.nasa.gov/multimedia/imag...3/W00018094.jpg http://saturn.jpl.nasa.gov/multimedia/imag...3/W00018092.jpg It appears to shift between these two http://saturn.jpl.nasa.gov/multimedia/imag...3/W00018096.jpg http://saturn.jpl.nasa.gov/multimedia/imag...3/W00018097.jpg |
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Sep 19 2006, 09:42 AM
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#37
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Alan, I suspect is a reflection/diffusion effect from strongly illuminated main rings; this because is visible also in the"best view of H ring" image posted before where it's nature is clear...
-------------------- I always think before posting! - Marco -
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Sep 19 2006, 10:18 AM
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#38
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
I believe the bright spot above the E-ring in the first image and above the G-ring in the second image is the Earth Another great catch, Alan! -------------------- I always think before posting! - Marco -
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Sep 19 2006, 12:41 PM
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#39
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Solar System Cartographer Group: Members Posts: 10150 Joined: 5-April 05 From: Canada Member No.: 227 |
dvandorn said "The H ring seems much darker and less reflective than the E ring" - isn't it much more likely that it's just optically thinner?
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Sep 19 2006, 02:27 PM
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#40
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
-------------------- - blue_scape / Nico -
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Sep 19 2006, 03:40 PM
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#41
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
I can see my house from here (or at least my home planet)! very VERY nice!
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Sep 19 2006, 04:18 PM
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#42
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Senior Member Group: Moderator Posts: 3232 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Cassini's Solar Eclipse labeled (91 KB): The ring you labeled the "F ring" is actually the G ring. Otherwise, great work. Nice to see Mercury included as well. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 19 2006, 05:07 PM
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#43
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
QUOTE The ring you labeled the "F ring" is actually the G ring. Thanks! Here's my revised version ... -------------------- - blue_scape / Nico -
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Guest_Sunspot_* |
Sep 19 2006, 10:27 PM
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#44
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Guests |
News Release: 2006-110 September 19, 2006
Scientists Discover New Ring and Other Features at Saturn Saturn sports a new ring in an image taken by NASA's Cassini spacecraft on Sunday, Sept. 17, during a one-of-a-kind observation. Other spectacular sights captured by Cassini's cameras include wispy fingers of icy material stretching out tens of thousands of kilometers from the active moon, Enceladus, and a cameo color appearance by planet Earth. The images were obtained during the longest solar occultation of Cassini's four-year mission. During a solar occultation, the sun passes directly behind Saturn, and Cassini lies in the shadow of Saturn while the rings are brilliantly backlit. Usually, an occultation lasts only about an hour, but this time it was a 12-hour marathon. Sunday's occultation allowed Cassini to map the presence of microscopic particles that are not normally visible across the ring system. As a result, Cassini saw the entire inner Saturnian system in a new light. The new ring is a tenuous feature, visible outside the brighter main rings of Saturn and inside the G and E rings, and coincides with the orbits of Saturn's moons Janus and Epimetheus. Scientists expected that meteoroid impacts on Janus and Epimetheus might kick particles off the moons' surfaces and inject them into Saturn orbit, but they were surprised that a well-defined ring structure exists at this location. Saturn's extensive, diffuse E ring, the outermost ring, had previously been imaged one small section at a time. The 12-hour marathon enabled scientists to see the entire structure in one view. The moon Enceladus is seen sweeping through the E ring, extending wispy, fingerlike projections into the ring. These very likely consist of tiny ice particles being ejected from Enceladus' south polar geysers, and entering the E-ring. "Both the new ring and the unexpected structures in the E ring should provide us with important insights into how moons can both release small particles and sculpt their local environments," said Matt Hedman, a research associate working with team member Joseph Burns, an expert in diffuse rings, at Cornell University in Ithaca, N.Y. In the latest observations, scientists once again see the bright ghost-like spokes -- transient, dusty, radial structures -- streaking across the middle of Saturn's main rings. Capping off the new batch of observations, Cassini cast its powerful eyes in our direction and captured Earth, a pale blue orb, and a faint suggestion of our moon. Not since NASA's Voyager 1 spacecraft saw Earth as a pale blue dot from beyond the orbit of Neptune has Earth been imaged in color from the outer solar system. "Nothing has greater power to alter our perspective of ourselves and our place in the cosmos than these images of Earth we collect from faraway places like Saturn," said Carolyn Porco, Cassini imaging team leader at the Space Science Institute, Boulder, Colo. Porco was one of the Voyager imaging scientists involved in taking the Voyager `Pale Blue Dot' image. "In the end, the ever-widening view of our own little planet against the immensity of space is perhaps the greatest legacy of all our interplanetary travels." In the coming weeks, several science teams will analyze data collected by Cassini's other instruments during this rare occultation event. The data will help scientists better understand the relationship between the rings and moons, and will give mission planners a clearer picture of ring hazards to avoid during future ring crossings. |
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Sep 20 2006, 04:08 AM
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#45
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
This forum digests new data so fast that by the time the press release shows up its already moved on to the next adventure.
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