M.P.E.C. 2012-N11, issued on 2012 July 9, reports the recovery of the PHA asteroid 1999 XL136 by R. H. McNaught with the 0.5-m Uppsala Schmidt + CCD in the course of the E12 Siding Spring Survey.
1999 XL136 was discovered on December 12, 1999 by LINEAR survey and observed for roughly 1 month (last observation was of January 09. 2000). It was classified as a PHA ((Potentially Hazardous Asteroid). PHA are asteroids larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
On July 08, 2012 E12 Survey discovered a relatively bright (16.5 magnitude) object and reported it to NEOCP with the provisional designation TN42425. After the arrival of follow-up observations by different observers around the world, MPC has been able to link TN42425 to the Apollo-type asteroid 1999 XL136, so to identify them as the same object.