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  1. #1
    Sagan's Avatar Carl Sagan
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    An update on Comet ISON and what may be coming next

    http://www.skyandtelescope.com/obser...193909261.html

    "November 29, 3:30 p.m. EST: A bold forecast."

    "1. Since yesterday's 'resurrection,' the comet's overall dust output has clearly increased dramatically as compared with its pre-perihelion situation.

    "2. Likewise, early yesterday the dust production appeared to consist almost exclusively of 'very heavy' dust particles. My impression this morning from the latest SOHO and STEREO images is that the comet is now experiencing a huge and ongoing dust release in a broad range particle sizes. If this continues, it is a very hopeful sign for visual observers in days to come.

    "3. I've mentioned several times that 1962's Comet Seki-Lines is the one other modern, dynamically 'new,' truly sunskirting comet whose photometric behavior is known in some detail. It likewise experienced a strange 'disappearance' right about the time of an anticipated brightness surge at perihelion, which had been expected to bring it to naked-eye daylight visibility at around magnitude –7.

    "4. A quick glance at ISON's appearance in the 12:30 UT SOHO image jogged my memory that it looks very much like another comet photo I saw long ago . . . of none other than Comet Seki-Lines! One of the earliest post-perihelion photos of Seki-Lines was one taken by, I believe, the great comet photographer of the 1960s and 70s, Alan McClure. It showed a strangely wedge-shaped, large, brilliant coma forming the beginnings of a huge, broad, tail created by an obviously wide range in dust-particle sizes. Sound familiar?:

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    http://youtu.be/zSgiXGELjbc

    "A still more glorious dawn awaits
    Not a sunrise, but a galaxy rise
    A morning filled with 400 billion suns
    The rising of the milky way"

    "The sky calls to us
    If we do not destroy ourselves
    We will one day venture to the stars" -Carl Sagan

  2. #2
    Sagan's Avatar Carl Sagan
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    Comet Ison dies again.
    http://spaceweather.com/

    Comet ISON is fading fast as it recedes from the sun. Whatever piece of the comet briefly survived its Thanksgiving Day brush with solar fire is now dissipating in a cloud of dust. Click to view a 3-day movie centered on perihelion (closest approach to the sun):



    http://youtu.be/zSgiXGELjbc

    "A still more glorious dawn awaits
    Not a sunrise, but a galaxy rise
    A morning filled with 400 billion suns
    The rising of the milky way"

    "The sky calls to us
    If we do not destroy ourselves
    We will one day venture to the stars" -Carl Sagan

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