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  1. #1
    Tony Flanders's Avatar
    Tony Flanders Guest

    Default Triple Shadow Transit Animation



    Jason Hatton's animation of last month's triple shadow transit on Jupiter
    can now be seen at http://skyandtelescope.com/news/article_1241_1.asp

    - Tony Flanders

  2. #2
    Michael McCulloch's Avatar
    Michael McCulloch Guest

    Default Triple Shadow Transit Animation

    On 16 Apr 2004 10:42:20 -0700, tony_flanders@yahoo.com (Tony Flanders)
    wrote:


    Sublime.

    Any description of the equipment/software used available?

    ---
    Michael McCulloch

  3. #3
    Tony Flanders's Avatar
    Tony Flanders Guest

    Default Triple Shadow Transit Animation

    Michael McCulloch <michaelm@nospam.invalid.net> wrote in message news:<5dj080h058fotibrr0s7fl9el199j3nlk5@4ax.com>. ..


    Hmm, I suppose I could have included that in the article. He uses
    a C9.25 and a webcam. More details on his website at
    http://members.aol.com/_ht_a/hattonj...tary-intro.htm.

    - Tony Flanders

  4. #4
    psc@prairienetX.org's Avatar
    psc@prairienetX.org Guest

    Default Triple Shadow Transit Animation

    Tony Flanders <tony_flanders@yahoo.com> wrote:


    Why does Ganymede, which appears so bright against the background sky,
    go jet black when in front of the planet? We can not see the "dark side"
    from our point of view, can we?

    Bryan

  5. #5
    Brian Tung's Avatar
    Brian Tung Guest

    Default Triple Shadow Transit Animation

    Bryan wrote:

    Was it Ganymede? Or Callisto? Callisto is quite dark; it is distinctly
    visible against the light clouds of Jupiter.

    Our own Moon is about as dark as asphalt. It looks bright grey only
    because it is seen against the backdrop of empty space. Watch Venus go
    behind the Moon during an occultation, and it will be plenty obvious how
    a satellite can appear so dark against a bright object, even though it
    clearly reflects enough light to be bright against the night sky.

    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt

  6. #6
    psc@prairienetX.org's Avatar
    psc@prairienetX.org Guest

    Default Triple Shadow Transit Animation

    Brian Tung <brian@isi.edu> wrote:




    The animation labels it Ganymede (bands of fairly bright brown, orange and
    white) and here's what the text said...

    "Click on the image above to see the 500-kilobyte animation. If you watch
    the second dark spot carefully, you will see that it is not a shadow but
    the moon Ganymede showing against the bright North Tropical Zone."

    Bryan


  7. #7
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Triple Shadow Transit Animation

    It was Ganymede. Callisto on that night had already finished its transit,
    as seen from Los Angeles, and only its shadow was left on the clouds of
    Jupiter. I saw how dark Ganymede looked through another telescope as I was
    imaging on mine. The friend that let me use his telescope thought it was
    Ganymede's shadow, but that didn't touch Jupiter's disk until a little after
    midnight. It's because both Callisto and Ganymede are darker than the
    clouds of Jupiter, but when seen against the blackness of space they appear
    bright. Same thing would happen with a candle; looks bright in a dark room
    but actually looks dark if you use floodlights on it (something that makes
    everything look very bright).
    --
    Sincerely,
    --- Dave

    ----------------------------------------------------------------------
    A man is a god in ruins.
    --- Duke Ellington
    ----------------------------------------------------------------------

    "Brian Tung" <brian@isi.edu> wrote in message
    news:c6rjad$acp$1@zot.isi.edu...
    Jupiter
    side"



  8. #8
    Mike Simmons's Avatar
    Mike Simmons Guest

    Default Triple Shadow Transit Animation

    On Thu, 29 Apr 2004 18:55:35 +0000 (UTC), <psc@prairienetX.org> wrote:

    As Dave said, it was Ganymede. I was also observing Jupiter that night
    and was quite surprised at how dark Ganymede looked against the planet. I
    had looked at it earlier in the evening, went on to other things and then
    went back to it. At first I was confused at first because it looked like
    there was one more shadow on the planet then there was supposed to be.
    After checking I confirmed that one "shadow" was Ganymede. Others noted
    the same thing -- it was very much darker than we expected.

    I can't recall a specific observation in which I've seen Ganymede
    transiting Jupiter but it seemed to me that it was darker than any other
    transit of one of Jupiter's moons that I've seen.

    Mike Simmons

  9. #9
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Triple Shadow Transit Animation

    Darker than Callisto? Unfortunately I don't have a visual observation of a
    Callisto transit, but one of my images showed it in front of Jupiter and it
    seemed darker than Ganymede, but the two images were not processed the same
    way so I don't really know.

    --
    Sincerely,
    --- Dave

    ----------------------------------------------------------------------
    A man is a god in ruins.
    --- Duke Ellington
    ----------------------------------------------------------------------

    "Mike Simmons" <mikes@mtwilson.nospam.edu> wrote in message
    newspr682kovi6xouqk@news.charter.net...
    side"



  10. #10
    Brian Tung's Avatar
    Brian Tung Guest

    Default Triple Shadow Transit Animation

    David Nakamoto wrote:

    I've visually observed both satellites transit, and there's no question
    Callisto is darker. But Ganymede is also darker than either Io or Europa.

    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt

 

 
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