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NEO - 2015 TB145

  1. Oct 30, 2015 #1


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    Five Things to Know About the 'Halloween Asteroid'
    https://gma.yahoo.com/5-things-know-halloween-asteroid-002900478--abc-news-Halloween.html [Broken]

    This asteroid was only discovered days ago. Coming within 1.3 lunar distances -- or ~310,000 miles (49000 km) -- the asteroid, called 2015 TB145 (width ~ 400 m), will brush past Earth but presents no threat to humans. NASA said this asteroid is incredibly fast and predicts it will zoom past Earth at 78,000 miles per hour (125500 kmph).

    http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 TB145;orb=1

    The next close encounter of an object that size is expected to happen in in August 2027. That asteroid -- 1999 AN10 -- is estimated to be ~800 m and will brush by our planet at a distance of about 238,000 miles, according to NASA.

    Back in January 2015, NASA cited the following:
    But now we have a closer encounter with 2015 TB145.

    Some background:
    https://en.wikipedia.org/wiki/(137108)_1999_AN10 - one of many Apollo asteroids

    As of 1 August 2015 NASA had listed a cumulative total of 1,605 discovered potentially hazardous asteroids (PHAs). Among these, there are 154 PHAs believed to be larger than one kilometer in diameter.

    But not to worry, they've always been there.
    Last edited by a moderator: May 7, 2017
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  3. Oct 31, 2015 #2


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    An impact of a 400 m asteroid is sufficient to devastate a larger region (energy of several thousand megatons TNT equivalent, >100 times the Tsar Bomba), and 20 days is a really short warning time - probably not enough for evacuations, especially as a precise orbit determination needs some time. Another good reason to improve the systematic searches for those asteroids.

    Here is a calculator for impact effects
    Last edited: Oct 31, 2015
  4. Oct 31, 2015 #3


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