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Neptunian System Imaging
nprev
post Oct 13 2010, 11:28 PM
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Wow, that animation's smooth; had to look hard twice to see that the white clouds were really moving. Nice!!!


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Astro0
post Oct 14 2010, 12:11 AM
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Stop that Machi. You're making my eyes hurt blink.gif
Brilliant.
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Juramike
post Oct 14 2010, 12:14 AM
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Wow! That was neat! It gave the impression of just sitting there watching Neptune silently rotate underneath.


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Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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brellis
post Oct 14 2010, 02:18 AM
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That is so relaxing to watch! Amazing work machi smile.gif
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sgendreau
post Oct 14 2010, 03:45 AM
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Holy smokes, machi -- that's gorgeous.
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ElkGroveDan
post Oct 14 2010, 04:27 AM
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That slow motion beauty could make it the opening scene for Stanley Kubrick's grandson's film 2041 A Space Iliad.


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nprev
post Oct 14 2010, 04:55 AM
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Yeah, there's definitely something @ the South Pole...can't tell if it's an innie or an outie, though.


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machi
post Oct 14 2010, 09:16 AM
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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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machi
post Oct 17 2010, 09:54 PM
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Partial mosaic of Neptune. Four NAC images over WAC image.
Color from CH4JS, CH4U and violet WAC images.
Attached thumbnail(s)
Attached Image
 


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machi
post Oct 31 2010, 08:59 PM
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Another partial mosaic of Neptune. Now at resolution 10.5 km/pix.
Color is added from global images (as uniform color).
Attached thumbnail(s)
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machi
post May 19 2011, 12:47 PM
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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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MarcF
post Oct 20 2012, 11:23 AM
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Not really new, but a nice article about Neptune spin time !

http://io9.com/5817732/scientists-calculat...tunes-spin-time


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tanjent
post Oct 21 2012, 01:58 AM
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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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MarcF
post Oct 21 2012, 12:47 PM
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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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tanjent
post Oct 22 2012, 09:47 AM
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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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