Neptunian System Imaging |
Neptunian System Imaging |
Oct 11 2010, 09:30 AM
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Neptune from Voyager 2. Color is from images with CH4JS, green and orange filter.
Shadows of three moons are visible. Second image is with possible interpretation. -------------------- |
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Oct 22 2012, 09:47 AM
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#2
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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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