Re: Ganymede transit - was there a cast shadow too?

glennhirsch@No-Spam
Date: Tue Dec 25 2001 - 18:34:35 MST

  • Next message: P T Chambers: "Re: Ganymede transit - was there a cast shadow too?"

    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 - 18:43:49 MST

    The Astronomy Connection -- Mailing List Archives