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Thread: Do you think VASCO will find any aliens?

  1. #1
    Join Date
    Feb 2010
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    771

    Do you think VASCO will find any aliens?

    As in "Vanishing & Appearing Sources during a Century of Observations".

    Described in a highly readable paper by Beatriz Villarroel and a huge cast of others, The Vanishing & Appearing Sources during a Century of Observations project: I. USNO objects missing in modern sky surveys and follow-up observations of a "missing star". Here's the abstract (I added bold):

    In this paper we report the current status of a new research program. The primary goal of the "Vanishing & Appearing Sources during a Century of Observations" (VASCO) project is to search for vanishing and appearing sources using existing survey data to find examples of exceptional astrophysical transients. The implications of finding such objects extend from traditional astrophysics fields to the more exotic searches for evidence of technologically advanced civilizations. In this first paper we present new, deeper observations of the tentative candidate discovered by Villarroel et al. (2016). We then perform the first searches for vanishing objects throughout the sky by comparing 600 million objects from the US Naval Observatory Catalogue (USNO) B1.0 down to a limiting magnitude of ∼20−21 with the recent Pan-STARRS Data Release-1 (DR1) with a limiting magnitude of ∼ 23.4. We find about 150,000 preliminary candidates that do not have any Pan-STARRS counterpart within a 30 arcsec radius. We show that these objects are redder and have larger proper motions than typical USNO objects. We visually examine the images for a subset of about 24,000 candidates, superseding the 2016 study with a sample ten times larger. We find about ∼ 100 point sources visible in only one epoch in the red band of the USNO which may be of interest in searches for strong M dwarf flares, high-redshift supernovae or other catagories of unidentified red transients.

  2. #2
    Join Date
    Jun 2003
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    Could these red objects with high proper motion simply be Oort cloud objects?

  3. #3
    Join Date
    Feb 2010
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    771
    Quote Originally Posted by eburacum45 View Post
    Could these red objects with high proper motion simply be Oort cloud objects?
    Never say never, but I very much doubt it.

    The proper motions would likely be much too small for Oort Cloud objects. And any such objects would likely be far too faint in the optical red waveband to be detected.

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