New Red Spot |
New Red Spot |
Guest_Sunspot_* |
Mar 3 2006, 06:56 PM
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Feb 18 2007, 11:21 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
John is the BAA's Jupiter Section director - and I saw a great talk by him a while back where he suggested that the current GRS might not be the one that is supposed to have been visible for so long - but is actually the second GRS since recorded observations of Jupiter begun hundreds of years ago.
Also - the current spot is 'speeding up'. In 1950 it was rotating in around 10 to 12 days. Now it's more like 4 - 6 days - but at the same time it's getting smaller so one can't assume it's getting faster as a result Observations of Jupiter are one of the great amateur projects still ongoing. Doug |
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Feb 22 2007, 04:53 PM
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
John is the BAA's Jupiter Section director - and I saw a great talk by him a while back where he suggested that the current GRS might not be the one that is supposed to have been visible for so long - but is actually the second GRS since recorded observations of Jupiter begun hundreds of years ago. Also - the current spot is 'speeding up'. In 1950 it was rotating in around 10 to 12 days. Now it's more like 4 - 6 days - but at the same time it's getting smaller so one can't assume it's getting faster as a result Observations of Jupiter are one of the great amateur projects still ongoing. Doug It is hard to tell. Before the early-mid nineteenth centuries, observations of sufficient quailty, both in terms of accuracy of the drawing and quality of the telescope, are spotty. But it is clear that the GRS is far from its former glory. For example, in this 1879 photograph by A. Common, the spot has the long appearance it had for the Pioneers, but, based on photos like this and visual observations, it was twice the size. The fact that the film used was sensitive to deep blue light jacked up the contrast, something I tro compensate for. -------------------- |
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