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Old 23-05-2018, 07:48 AM
Tropo-Bob (Bob)
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Join Date: Sep 2013
Location: Cairns
Posts: 1,584
Callisto

Quote:
...I attempted an estimate of how far Callisto's orbital plane was north of Ganymede's. I thought about the same as the distance between the polar edges of the Equatorial Belts, or about 40% of the North-South diameter of Jupiter. I hope to test this by seeing Callisto pass Jupiter's South Pole by approximately this distance on the evening of 22nd May, at about 6pm. (Ganymede is only just inside Jupiter's disc at the pole when it passes, so Callistro should be approximately 35-40% of Jupiter's polar-diameter...
Callisto passed to the South of Jupiter last night at about 6-7pm, but clouds stopped me from seeing anything till about 9.15pm. by this time, Callisto had moved a little away from Jupiter. Nevertheless, looking at Callisto position, I estimated that it passed to the South of the planet by no more that 20% of Jupiter's polar-diameter. This is somewhat less than my previous estimate. (Used Vixen ED81mm with 85x (Yes, I keep calling this 80mm, but it is really 81mm).


Future events, which I will attempt to view:-
28/5 Ganymede transit and shadow events.
29/5 Io transit and shadow events.
30/5(around midnight) Callisto passes by Jupiter's northern pole.
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