That would be my guess, Glenn. I can usually pick out the shadow but the
moon itself is much harder depending on what part of Jupiter it is over.
---------
Phil Chambers [ptchamb@No-Spam] (S.F. Bay Area - Calif. USA)
On Tue, 25 Dec 2001 glennhirsch@No-Spam wrote:
>
> so the clearer, darker tiny disk I saw was the SHADOW and the less
> distinct, fuzzier tiny disk I saw was the MOON ...?
>
> thanks Phil and happy xmas
>
>
> ----- Original Message -----
>
> From: P T Chambers
>
> To: sf-bay-tac@No-Spam
>
> Sent: 12/25/2001 5:08:41 PM
>
> Subject: Re: [TAC] Ganymede transit - was
> there a cast shadow too?
>
>
>
>
>
> Hi Glenn
>
> Yes, If the moon is over Jupiter from our perspective, it can easily
> be
>
> harder to see than the shadow. The shadows usually stand out in
> stark
>
> contrast to the surface of Jupiter.
>
>
>
> ---------
>
> Phil Chambers [ptchamb@No-Spam ]
> (S.F. Bay Area - Calif. USA)
>
>
>
> On Tue, 25 Dec 2001 glennhirsch@No-Spam
> wrote:
>
>
>
>
>
> Last night @ 1230am in SF using an 8" dobs with a tak le 7mm
> eypiece,
>
> I spied Jupiter through a brief cloud hole -- I had a surprisingly
> steady
>
> view @ 175x showing Ganymede's tiny black disk just above the
> red
>
> spot.
>
>
>
>
>
>
>
> I thought I also saw the moon's cast shadow -- did I? Is a cast
> shadow
>
> visible during a transit in addition to a moon's silhouette?
>
>
>
> Glenn Hirsch
>
>
>
>
>
This archive was generated by hypermail 2b29 : Tue Dec 25 2001 - 20:00:20 MST