Re: Double shadow transit happening on Jupiter (12:30)

I watched from about 10 pm on.

At 10 pm, Europa WAS transiting (per starry nights) but I could not
see it.

I could see Gannymede itself and Europa's shadow - so close together I
wasn't sure there were two dots, but over time they separated and I
could clearly see two BLACK dots.
Gannymede's larger shadow showed up just on time at about 11:45 (all
per Starry Nights). At that point I could see Gannymede itself,
Europa's shadow, and Gannymede's shadow - all on the face and all
exactly where they should be per Starry Nights. Io was clearly
visible off one side and Europa clearly visible off the other.

My only question is this: Gannymede itself appeared to me as a black
dot, but it seems like it should have been sunlit and not visible
(blend with Jupiter) or possibly showing brighter than Jupiter - but
it was a black dot throughout two hours of observation.....why??

Doug

On Sep 3, 2009, at 2:42 PM, Randy Muller wrote:

> The black dots were the shadows of Europa and Ganymede, not Europa and
> Ganymede themselves. Per Steve's message, Europa and Io were not
> transiting, but were off to either side of Jupiter. Ganymede was
> transiting, and was between the two shadows. It was not dark like the
> shadows.
>
> I seems that you did not see Ganymede at all, but only saw two
> shadows.
>
> On Thu, Sep 3, 2009 at 2:07 PM, Douglas Fairbairn<dgfairbairn@No-Spam
> > wrote:
>> I saw this too.... looked very cool....
>>
>> Just explain one thing - when Ganymede and Europa were transiting
>> Jupiter -
>> why did they appear as black dots? why weren't the sunlit? They were
>> sunlit/visible when they were off the limb of the planet....
>>
>> Doug
>>
>>
>> On Sep 3, 2009, at 12:31 AM, Steve Gottlieb wrote:
>>
>>> Yep, 3 discs (all different in appearance) at once on Jupiter are
>>> making a
>>> great sight with Europa and Io close to Jupiter on either side.
>>> Wow.
>>>
>>> Steve
>>>
>>> On Sep 3, 2009, at 12:15 AM, Dana Patchick wrote:
>>>
>>>> I'm with you, Steve. It's a great sight! Even Ganymede is showing
>>>> up
>>>> between the two shadows - and closer to Europa's decidedly
>>>> smaller shadow.
>>>>
>>>> -Dana
>>>>
>>>>
>>>> ----- Original Message ----- From: "Steve Gottlieb"
>>>> <steve_gottlieb@No-Spam>
>>>> To: "TAC mailing list" <tac@No-Spam>
>>>> Cc: "TAC-SAC" <tac-sac@No-Spam>
>>>> Sent: Thursday, September 03, 2009 12:03 AM
>>>> Subject: [TAC] Double shadow transit happening on Jupiter
>>>>
>>>>
>>>>> If anyone's up at midnight -- the shadow's of Europa and
>>>>> Ganymede are
>>>>> both easily visible with Ganymede, itself, transiting. Very cool.
>>>>>
>>>>> Steve
>>>>> ---
>>>>>
>>>>> August 16, 2009: TAC Web Page Updated
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>>>>
>>>> ---
>>>>
>>>> August 16, 2009: TAC Web Page Updated
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>>>
>>> ---
>>>
>>> August 16, 2009: TAC Web Page Updated
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>>> TAC mailing list - to join, manage, or leave:
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>>
>> ---
>>
>> August 16, 2009: TAC Web Page Updated
>> http://observers.org/TAC.cgi/Announcements/
>> Star Party! CalStar: Sept 17-20: http://www.observers.org/CalStar
>> TAC mailing list - to join, manage, or leave:
>> http://nine.pairlist.net/mailman/listinfo/tac
>>
> ---
>
> August 16, 2009: TAC Web Page Updated http://observers.org/TAC.cgi/Announcements/
> Star Party! CalStar: Sept 17-20: http://www.observers.org/CalStar
> TAC mailing list - to join, manage, or leave: http://nine.pairlist.net/mailman/listinfo/tac

---
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