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Old 30-07-2009, 07:24 AM
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StephenM (Stephen)
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Ganymede shadow transit 29July09

Hi all,

Did anyone else see Ganymede's shadow transit last night? I was unable to clearly detect the Bird Strike last week, but this shadow was very easy - the best transit that I've seen so far. I spent nearly an hour observing it, and it's amazing how fast the moons move in such a short time! At the start of the session, Ganymede was well separated from the limb of Jupiter and the shadow was over towards the limb, and by the time I packed up Ganymede was crossing the limb and the shadow was near the central meridian.

The shadows are definately easier to detect this year, as they are falling in the lighter cloud band near the equator. The seeing did not appear to be great for most of the time, but there were periods when it was quite good.

Anyway, I'll try and catch a few more of these shadow transits while Jupiter is near opposition!

Cheers,
Stephen
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Old 30-07-2009, 09:11 AM
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hotspur (Chris)
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re jupiter moons

Yes,watching shodows of moons on Jupiter is most enjoyable,i really

like this aspect of visual astronomy,when you show non-astronomers this

they really are amazed.that it be observered from backyard in modest scpoes.

I have seen two shadows at once,that was just so good.

regards Chris
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