New Iapetian image series |
New Iapetian image series |
Apr 5 2007, 08:40 PM
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#76
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
No, it really is November 2005. The January 2006 encounter was more distant, in fact I've got the entire sequence assembled into an image and an animation. It can be found here.
The distant approach images from November and January are pretty similar, but if you look closer the January images show more of the Snowman in sunlight. -------------------- |
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Apr 6 2007, 07:13 PM
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#77
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
That November 2005 image is interesting for another reason. Look at the 8 o'clock position on Iapetus' limb. You can see one of the large basins in profile. This one isn't normally as easy to pick out as some of the others.
It looks to me like the upcoming April 15th shots of Iapetus might have a chance of catching the big Roncevaux Terra basin in a similar profile. |
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Apr 12 2007, 09:06 PM
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#78
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Member Group: Members Posts: 288 Joined: 28-September 05 From: Orion arm Member No.: 516 |
Hi,
here some infos about the upcoming far-encounter: april 15 -> 2 clear und 19 color images april 17 -> 1 clear, 6 color and 3 WAC-images april 18 -> 2 clear, 34 color and 2 WAC-images april 21 -> 2 clear, 6 color and 2 WAC-images Resolution (NAC) will be about 14 km/pxl. Bye. |
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Apr 15 2007, 08:53 AM
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#79
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Member Group: Members Posts: 288 Joined: 28-September 05 From: Orion arm Member No.: 516 |
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Apr 16 2007, 02:42 PM
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#80
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
More food, Iapetus hounds:
http://saturn.jpl.nasa.gov/multimedia/imag...iImageID=107531 |
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Apr 16 2007, 02:44 PM
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#81
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
For fans of Roncevaux Terra, the first set of Iapetus images from this very distant encounter are now up.
As I'd hoped, it looks as if the big trailing-side basin can be seen in profile as a "flat spot" on the moon's limb at about the 4:00 position. There seems to be a central peak visible. There are also a couple of dark spots visible that may not have been seen before. And (once again) we get a tantalizingly fuzzy look at the Snowman crater system. No sign of the bellyband on the moon's limb -- but 2.2 million kilometres is very long-range -- it may just not be that high at that particular point. We'll find out in a few months. |
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Apr 16 2007, 03:16 PM
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#82
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
More food, Iapetus hounds Wow. If there's one Iapetus image that's radically different from all previous Cassini images of this moon, it's this one.
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Apr 16 2007, 03:41 PM
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#83
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Member Group: Members Posts: 288 Joined: 28-September 05 From: Orion arm Member No.: 516 |
Ahh,
there they are... Here two takeouts, ~3x enlarged: Distance: 2,258,272 km Filters: BL1 and CL2 Distance: 2,258,232 km Filters: UV1 and CL2 The trailing-side basin must have been a really big hit. Interesting is also huge step/rim in the north polar region. Is there a hidden basin? A tectonic fracture? Or what else? Curious to see the moons almost bright side, doesn't look like Iapetus... Bye. |
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Apr 16 2007, 03:58 PM
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#84
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
Interesting is also huge step/rim in the north polar region. Is there a hidden basin? A tectonic fracture? Or what else? I noticed that too. I think it's probably a topographic feature that looks brighter than the surrounding area because it is tilted towards the Sun. We saw this kind of thing in the south polar region last year. |
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Apr 16 2007, 04:23 PM
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#85
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Member Group: Members Posts: 288 Joined: 28-September 05 From: Orion arm Member No.: 516 |
I noticed that too. I think it's probably a topographic feature that looks brighter than the surrounding area because it is tilted towards the Sun. I remember such a structure from this saturnshine image:We saw this kind of thing in the south polar region last year. Date: 2004-10-22 Distance: ~1.6 million km Could be the same or a different one... I'm not quite sure, wasn't this region observed during the Newyear's flyby 2005? There were some saturnshine images... |
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Apr 16 2007, 04:42 PM
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#86
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
This is a composite of four of the new images. I recall that stereo viewing of Voyager images of this northern bright area revealed apparently tectonic lineaments in this area - probably one of the old NASA TM reports on the geology and geophysics program.
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 PDF: 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) |
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Apr 16 2007, 07:05 PM
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#87
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
If I'm not mistaken all these features show up very well on the Iapetus mosaic map on CiCLOPS. The big basin complex lower centre at about longitude 320 and the ones up north at about longitude 0. If I'm totally wrong please tell me gently.
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Apr 16 2007, 09:33 PM
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#88
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Member Group: Members Posts: 288 Joined: 28-September 05 From: Orion arm Member No.: 516 |
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Apr 16 2007, 11:11 PM
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#89
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Iapetus is a relatively small part of the image thus the image is more likey to get overstretched by the algorithm they are using. Thats what appears to have happened to the bright patches which are located in the area which is receiving the maximum sunlight.
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Apr 17 2007, 02:24 AM
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#90
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
Thanks for the composite, Phil.
In addition to the poorly known parts of Iapetus that are near its limb on this sequence of photos, we're also getting a much better look at some topography on the terminator. There are a couple of big craters on the northern terminator that have been hinted at in previous images but for one reason or another just haven't been very visible before now. Over the course of the next few days these craters will become more visible. Cassini seems to be "chasing" Iapetus for the time being -- it will maintain about this distance for the next week or so. Perfect time for shooting stereo pairs! |
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