Results 1 to 3 of 3
  1. #1
    here today
    Reputation: zenmonkey's Avatar
    Join Date
    Nov 2004
    Posts
    5,931

    Mercury at your doorstep


    Click on image to enlarge.






    One week ago, the MESSENGER spacecraft transmitted to Earth the first high-resolution image of Mercury by a spacecraft in over 30 years, since the three Mercury flybys of Mariner 10 in 1974 and 1975. MESSENGER's Wide Angle Camera (WAC), part of the Mercury Dual Imaging System (MDIS), is equipped with 11 narrow-band color filters, in contrast to the two visible-light filters and one ultraviolet filter that were on Mariner 10's vidicon camera. By combining images taken through different filters in the visible and infrared, the MESSENGER data allow Mercury to be seen in a variety of high-resolution color views not previously possible. MESSENGER’s eyes can see far beyond the color range of the human eye, and the colors seen in the accompanying image are somewhat different from what a human would see.

    The color image was generated by combining three separate images taken through WAC filters sensitive to light in different wavelengths; filters that transmit light with wavelengths of 1000, 700, and 430 nanometers (infrared, far red, and violet, respectively) were placed in the red, green, and blue channels, respectively, to create this image. The human eye is sensitive across only the wavelength range 400 to 700 nanometers. Creating a false-color image in this way accentuates color differences on Mercury's surface that cannot be seen in the single-filter, black-and-white image released last week.

    This visible-infrared image shows an incoming view of Mercury, about 80 minutes before MESSENGER's closest pass of the planet on January 14, 2008, from a distance of about 27,000 kilometers (17,000 miles).

    Image sequences acquired through the 11 different MDIS filters are being used to distinguish subtle color variations indicative of different rock types. By analyzing color differences across all 11 filters, the MESSENGER team is investigating the variety of mineral and rock types present on Mercury’s surface. Such information will be key to addressing fundamental questions about how Mercury formed and evolved.

    Mercury has a diameter of about 4880 kilometers (3030 miles), and the smallest feature visible in this color image is about 10 kilometers (6 miles) in size.

    Mission Elapsed Times (MET) of images: 108820022, 108820037, 108820057


    Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington


    [SIZE=3]Mercury - in Color![/SIZE]
    Release Date: January 22, 2008
    Keywords: Mercury Flyby 1, WAC

  2. #2
    Who are the brain police?
    Reputation: Locoman's Avatar
    Join Date
    Jan 2004
    Posts
    9,995
    Quote Originally Posted by zenmonkey
    ...Image sequences acquired through the 11 different MDIS filters are being used to distinguish subtle color variations indicative of different rock types. By analyzing color differences across all 11 filters, the MESSENGER team is investigating the variety of mineral and rock types present on Mercury’s surface. Such information will be key to addressing fundamental questions about how Mercury formed and evolved.

    Mercury has a diameter of about 4880 kilometers (3030 miles), and the smallest feature visible in this color image is about 10 kilometers (6 miles) in size.
    For real? Only 11 different MDIS filters?











    .
    The Who - Glittering Girl
    Ween - The Grobe
    Yellowman - Strong Me Strong
    all your base are belong to us

  3. #3
    we have fossils, we win
    Reputation: LosingSleep's Avatar
    Join Date
    Jul 2007
    Posts
    1,077
    I was going to get into astrophotography but decided not to pick up another non-physical hobby.
    Only the most deluded of us could doubt the necessity of this war. ~John McCain

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •