Quelle:
http://www.nasa.gov/mission_pages/asteroids/news/comet20130305.html (Archiv-Version vom 06.04.2013)March 21, 2013 Update:
New observations of comet C/2013 A1 (Siding Spring) have allowed NASA's Near-Earth Object Office at the Jet Propulsion Laboratory in Pasadena, Calif. to refine the comet's orbit.
Using observations through March 15, 2013, the latest orbital plot places the comet's closest approach to Mars a little farther out than previously estimated, at about 73,000 miles (118,000 kilometers) from the surface of the Red Planet. The impact probability has decreased accordingly; it is now about 1 in 8,000. The latest estimated time for close approach to Mars is about 11:45 a.m. PDT (18:45 UTC) on Oct. 19, 2014. At the time of closest approach, the comet will be on the sunward side of the planet. The comet and its tail should be a spectacular sight in the pre-dawn Martian sky just before closest approach, as well as in the post-dusk sky just after closest approach.
Future observations of the comet are expected to refine the orbit further. The most up-to-date close-approach data can be found at:
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2013%20A1;orb=0;cov=0;log=0;cad=1;rad=0#cad (Archiv-Version vom 01.01.2016) .
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Ein Einschlag würde möglicherweise 20 Millionen Megatonnen TNT stark sein.
Und er Explosion Blitz 500 mal heller als die Sonne !
Aber ein einschalg ist unwahrscheinlich geworden, denn:
Impact Risk von 1 : 2000 auf 1 : 8000 angehoben.
MFG O.G.