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Peanut-shaped near-Earth asteroid imaged by radar

  1. Aug 3, 2015 #1
    Why is the brightest part of the asteroid radar image below the upper edges?

    PIA19647_940x464.jpg

    From,

    http://astronomynow.com/2015/08/03/peanut-shaped-near-earth-asteroid-1999jd6-imaged-by-radar/

    Is it a software effect? I would naively think that the greatest radar intensity would be reflected from the parts of the asteroid nearly perpendicular to our view. A Google image search shows a similar trend.

    https://www.google.com/search?safe=...3.0....0...1ac.1.64.img..0.18.879.Clm93sqRtmU
     
  2. jcsd
  3. Aug 3, 2015 #2

    DaveC426913

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    Well, for starters, the radar emitter and receiver are in different locations.
     
  4. Aug 3, 2015 #3
    Right, but at the distance to the asteroid, the angle formed by the emitter, reflector, and absorber is nearly zero?
     
  5. Aug 3, 2015 #4

    DaveC426913

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    Yeah. It was a reach. :biggrin:

    I'll bet that we are seeing solar EM radiation in the radar range.
     
  6. Aug 4, 2015 #5

    RaulTheUCSCSlug

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    Looks more like a dumbbell then a peanut :biggrin: and well could it be due to something like a Doppler shift?

    Edit: Nevermind I don't think it would make much sense since the radar emitter is the one emitting the rays, not the asteroid... right? Unless the asteroid is emitting radiation as well.
     
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