Comet C/2010 X1 (Elenin) is a long-period comet discovered by Russian astronomer Leonid Elenin on December 10, 2010 at the International Scientific Optical Network's robotic observatory near Mayhill, New Mexico, U.S.A. http://en.wikipedia.org/wiki/C/2010_X1

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Close-Approach Data ...sorted by Date/Time (TDB)
Date/Time (TDB) 2011-Oct-16 19:53
Time Uncertainty (days_HH:MM) 00:01
Body Earth
Nominal Distance (AU) 0.2338389514638
Minimum Distance (AU) 0.23378764355648
Maximum Distance (AU) 0.233890260437549

http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=elenin%3Borb%3D1%3Bcov%3D0%3Blog%3D0%3Bcad%3D0#orb

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