Neptunian System Imaging |
Neptunian System Imaging |
Oct 13 2010, 11:28 PM
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#16
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Wow, that animation's smooth; had to look hard twice to see that the white clouds were really moving. Nice!!!
-------------------- 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.
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Oct 14 2010, 12:11 AM
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#17
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Stop that Machi. You're making my eyes hurt
Brilliant. |
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Oct 14 2010, 12:14 AM
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#18
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Wow! That was neat! It gave the impression of just sitting there watching Neptune silently rotate underneath.
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Oct 14 2010, 02:18 AM
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#19
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Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
That is so relaxing to watch! Amazing work machi
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Oct 14 2010, 03:45 AM
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#20
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Junior Member Group: Members Posts: 79 Joined: 11-September 09 Member No.: 4937 |
Holy smokes, machi -- that's gorgeous.
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Oct 14 2010, 04:27 AM
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#21
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
That slow motion beauty could make it the opening scene for Stanley Kubrick's grandson's film 2041 A Space Iliad.
-------------------- If Occam had heard my theory, things would be very different now.
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Oct 14 2010, 04:55 AM
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#22
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Yeah, there's definitely something @ the South Pole...can't tell if it's an innie or an outie, though.
-------------------- 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.
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Oct 14 2010, 09:16 AM
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#23
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks!
Every planet, especially planets with atmosphere, looks so majestic from close. "Yeah, there's definitely something @ the South Pole...can't tell if it's an innie or an outie, though." I see central eye of the south pole "hurricane" and three clouds in him. One cloud is prominent, two clouds are nearly invisible. I have somewhere article in which authors directly measured wind speed at south pole, perhaps using these clouds. -------------------- |
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Oct 17 2010, 09:54 PM
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#24
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Partial mosaic of Neptune. Four NAC images over WAC image.
Color from CH4JS, CH4U and violet WAC images. -------------------- |
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Oct 31 2010, 08:59 PM
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#25
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Another partial mosaic of Neptune. Now at resolution 10.5 km/pix.
Color is added from global images (as uniform color). -------------------- |
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May 19 2011, 12:47 PM
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#26
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Small (10s of km) bright clouds over Neptunian South Pole Region. Narrow angle camera (NAC) image has resolution around 7.4 km/pix.
Details are extremely enhanced (in NAC image), but color (from violet and green wide angle camera images) is very decent. Subtle shadows under two small clouds are visible. -------------------- |
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Oct 20 2012, 11:23 AM
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#27
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
Not really new, but a nice article about Neptune spin time !
http://io9.com/5817732/scientists-calculat...tunes-spin-time |
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Oct 21 2012, 01:58 AM
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#28
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Member Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 |
The article uses the puzzling phrase "we thought we knew" to suggest that the radio-based measures of the big planets are somehow invalid, but does not explain why any combination of atmospheric features, observed for any length of time, should give a better estimate of the rotation time of the planetary core. He makes a convincing case that different atmospheric strata, at different latitudes, rotate at different speeds. It is remarkable that he finds as much consistency among multiple features as he does, but why should these supplant the radio-based measures?
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Oct 21 2012, 12:47 PM
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#29
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
Some more informations can be found here:
http://uanews.org/node/40494 "So based on those radio signals, we thought we knew the rotation periods of those planets" But when the Cassini probe arrived at Saturn 15 years later, its sensors detected its radio period had changed by about 1 percent. Karkoschka explained that because of its large mass, it was impossible for Saturn to incur that much change in its rotation over such a short time... Even more puzzling was Cassini's later discovery that Saturn's northern and southern hemispheres appear to be rotating at different speeds. "That's when we realized the magnetic field is not like clockwork but slipping," Karkoschka said. "The interior is rotating and drags the magnetic field along, but because of the solar wind or other, unknown influences, the magnetic field cannot keep up with respect to the planet's core and lags behind." |
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Oct 22 2012, 09:47 AM
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#30
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Member Group: Members Posts: 214 Joined: 30-December 05 Member No.: 628 |
Hey thanks MarcF. That sounds like a clear reason to reject the radio signal-based measure. Earth's field also meanders around and it originates in the liquid regions of the interior IIRC, so no reason to think it works differently on other planets. But I still have to doubt that any number of observations of the visible atmospheric strata are likely to conclusively match Neptune's core rate. Maybe that doesn't matter as long as you have something stable to point to. (At Saturn I suppose it might be harder to find a stable constellation of spots to observe because the seasonal broadening and narrowing of the ring shadows probably influences the rotation rate by thermally by inducing changes in the radius.)
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