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Detectability of Extraterrestrial Technological Activities

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Author Topic: Detectability of Extraterrestrial Technological Activities  (Read 710 times)
Jennifer Murdoch
Superhero Member
Posts: 5235

« Reply #15 on: February 04, 2010, 01:22:14 pm »

Because line-of-sight radar astrometric measurements have much finer
       intrinsic fractional precision  than  their  optical  plane-of-sight
       counterparts, they are   potentially   valuable   for  refining  the
       knowledge of planetoid and comet  orbits.   Radar  is  an  essential
       astrometric tool, yielding both a direct range to  a  nearby  object
       and the radial  velocity  (with  respect  to  the observer) from the
       Doppler shifted echo (Yeomans et  al,  1987,  Ostro et al, 1991, and
       Yeomans et al, 1992).

       Since in our  solar  system, most of Earth's nearby  planetoids  are
       discovered as a  result  of their rapid motion across the sky, radar
       observations are therefore   often    immediately    possible    and

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