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Thread: Cassini and Saturn's moons

  1. #1
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    Cassini and Saturn's moons

    Everything I need to know I learned through Googling.

  2. #2
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    And Rhea
    Everything I need to know I learned through Googling.

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    Next up: Tethys.
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    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

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    Ding. Enceladus.

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    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

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    The "Death Star" Moon: Mimas



    The official NASA caption is "That's no space station."
    Everything I need to know I learned through Googling.

  6. #6
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    Quote Originally Posted by ToSeek
    The official NASA caption is "That's no space station."

    I guess relating to this thread it means we are in the Star Wars universe after all.
    At night the stars put on a show for free (Carole King)

    All moderation in purple - The rules

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    Purple haze all in my brain
    Lately things just donít seem the same
    Actin' funny, but I don't know why
    'Scuse me while I kiss the sky

    Titan's purple haze, thumbnail:
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    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

  8. #8
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    Quote Originally Posted by 01101001
    Purple haze all in my brain
    Lately things just donít seem the same
    Actin' funny, but I don't know why
    'Scuse me while I kiss the sky
    Thanks Jimmy! 8) [Beats Purple Rain ]

    It is intriguing that the Rayleigh scattering is only in the upper and, I suppose, lower atmosphere. This seems surprising to me. A rough guess would be only the upper regions have the smaller molecules (thanks in part to the molecular break-down the article discussed) allowing the scattering. Large molecules do not allow much scattering of shorter wavelength light.
    We know time flies, we just can't see its wings.

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    Here is an animation of what I'm pretty sure is Saturn's south pole:

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    And here is an animation of Cassini's approach to Titan:

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    The Sky at Night: Moons of Saturn

    If you missed it on TV, you can now watch it online! (Well, sort of. RealOne Player, or such-like, required.)

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    Was there a Cassini update on NASATV today? There was something scheduled for 1pm EDT but I was out at the time.

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    Tumbling Hyperion

    Thumbnail:

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    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

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    OUT FROM THE SHADOWS: TWO NEW SATURNIAN MOONS

    With eyes sharper than any that have peered at Saturn
    before, the Cassini spacecraft has uncovered two moons, which
    may be the smallest bodies so far seen around the ringed
    planet.

    The moons are approximately 3 kilometers (2 miles) and 4
    kilometers (2.5 miles) across -- smaller than Boulder, Colo.
    edit: That brings the total to 33, I believe. The article doesn't mention the total, and I haven't looked it up in a while, but I keep a running total of the solar system's moons on my desktop and at last count I had Saturn with 31.

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    Quote Originally Posted by pumpkinpie
    edit: That brings the total to 33, I believe. The article doesn't mention the total, and I haven't looked it up in a while, but I keep a running total of the solar system's moons on my desktop and at last count I had Saturn with 31.
    You're correct. Satellite discoverer Scott Sheppard's site has up-to date information on giant planet satellites.

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    I'm sure this was discussed before: At which size they will stop to call these rocks 'moons'?

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    Quote Originally Posted by kucharek
    I'm sure this was discussed before: At which size they will stop to call these rocks 'moons'?
    Currently there is not any official lower limit.

  20. #20
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    Looks like the Cassini Picture of the Day on the Cassini homepage haven't been updated...

    From the CICLOPS site: Streaking Away from Dione

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    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

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    Everything I need to know I learned through Googling.

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    Cassini is approaching a 1.1 million km flyby of Iapetus in the next several days and the narrow angle images will be higher resolution than any from Voyager. However, there is evidently a pointing error occurring as a number of the recent images donít actually include Iapetus in the frame. The last narrow angle posted that does http://saturn.jpl.nasa.gov/multimedi.../N00021473.jpg shows some topography in Cassini Regio.

    I understand that pointing errors have occurred earlier Ė an image of Hyperion from about 750,000 km was missed a day or two after SOI.

    Also, after the upcoming Titan flyby there will be opportunities for imaging Tethys and Mimas from a few hundred thousand km at highest resolutions of 1.5 and 2 km/pixel respectively.

  28. #28
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    Tethys

    Here's a great raw image of Tethys showing it's largest crater to good effect:

    http://saturn.jpl.nasa.gov/multimedi...iImageID=26004

  29. #29
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    Re: Tethys

    Quote Originally Posted by Ian R
    Here's a great raw image of Tethys showing it's largest crater to good effect:

    http://saturn.jpl.nasa.gov/multimedi...iImageID=26004
    Gee, don't you think that after all the work it did at Titan on Tuesday, Cassini deserves a break? But noOOO.....the scientists insist, "Now go take a picture of THIS moon!" C'mon, give Cassini a break!

    :wink:

    J/K Great picture! I'm so excited about all these great moon pics still to come!

  30. #30
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    ...and it's still not finished yet!

    POST-TITAN A IMAGE OF DIONE:
    http://saturn.jpl.nasa.gov/multimedi...iImageID=26000

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