Near Earth Asteroids Potentially Hazardous Asteroids (PHAs) are space rocks 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 November 3, 2011 there were 1256 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid Date(UT) Miss Distance Mag. Size2011 UX255 Oct 28 0.4 LD -- 15 m2011 FZ2 Nov 7 75.9 LD -- 1.6 km2005 YU55 Nov 8 0.8 LD -- 200 m2011 UT91 Nov 15 9.9 LD -- 102 m1994 CK1 Nov 16 68.8 LD -- 1.5 km1996 FG3 Nov 23 39.5 LD -- 1.1 km2003 WM7 Dec 9 47.6 LD -- 1.6 km1999 XP35 Dec 20 77.5 LD -- 1.0 km2000 YA Dec 26 2.9 LD -- 80 m2011 SL102 Dec 28 75.9 LD -- 1.1 kmNotes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.
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