T16 RADAR SAR Swath, Land o' lakes |
T16 RADAR SAR Swath, Land o' lakes |
Jul 24 2006, 09:33 PM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Much to my surprise, a chunk of the T16 Sar swath as been released:
http://photojournal.jpl.nasa.gov/catalog/PIA08630 An abundance of lakes can been seen. Some appear to be crater lakes (or sinkholes), like the lake at far left on the top cutout. That lake appears similar to Crater Lake in Oregon, with a little island in the middle (you can kinda see the attenuation of the signal surrounding the island as the methane gets deeper). Some lakes appear quite distinctive from the surrounding terrain, like the features on the right part of the bottom cutout. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Aug 9 2006, 02:59 AM
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Junior Member Group: Members Posts: 66 Joined: 8-November 05 From: Australia Member No.: 547 |
In terms of Titanian skygazing, note that the ratio of sunshine (daytime) vs. saturnshine (selected nighttimes) would be much smaller than sunshine vs. moonlight ("moonshine"?!) on Earth. Something like ~6 magnitudes. It would probably be bright enough to read by saturnshine on a Titan night. Has anyone estimated the illumination levels on Titans surface during day/night? Has the Huygens probe measured this directly? Typically, for earth conditions, the following levels are typical: Twilight - 4 lux Full Moon - 0.2 lux No Moon - 0.001 lux |
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Aug 9 2006, 06:19 AM
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Junior Member Group: Members Posts: 51 Joined: 12-March 06 From: Zurich, Switzerland Member No.: 703 |
Has anyone estimated the illumination levels on Titans surface during day/night? Has the Huygens probe measured this directly? Typically, for earth conditions, the following levels are typical: Twilight - 4 lux Full Moon - 0.2 lux No Moon - 0.001 lux There is some information about daylight illumination levels on Titan’s surface in one of the Huygens’ Papers, released last December (Tomasko et al., 2005) “The brightness of the surface of Titan is about a thousand times dimmer than full solar illumination on the Earth (or 500 times brighter than illumination by full moonlight). That is, the illumination level is about that experienced about 10 min after sunset on the Earth. The colour of the sky and the scene on Titan is rather orange due to the much greater attenuation of blue light by Titan's haze relative to red light. If the Sun is high in the sky, it is visible as a small, bright spot, ten times smaller than the solar disk seen from Earth, comparable in size and brightness to a car headlight seen from about 150 m away. The Sun casts sharp shadows, but of low contrast, because some 90% of the illumination comes from the sky. If the Sun is low in the sky, it is not visible.” During the night, it will probably be quite dark at the Huygens Landing Site, since this place it on the anti-saturnian hemisphere of Titan. Concerning the T16 RADAR Swath: I am also anxious to know if there are some really striking parts left to be released, but I guess patience is mandatory here. |
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