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 March 8, 2012 there were 1287 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:

Asteroid	Date(UT)	Miss Distance	Mag.	Size
2012 EA	Mar 3	2.6 LD	--	18 m
2012 DU60	Mar 3	9.1 LD	--	37 m
2012 EM1	Mar 6	7.6 LD	--	21 m
2008 EJ85	Mar 6	9.1 LD	--	44 m
2012 DH54	Mar 10	3.3 LD	--	13 m
2012 DW60	Mar 12	2.5 LD	--	23 m
1999 RD32	Mar 14	57.9 LD	--	2.4 km
2011 YU62	Mar 16	73.4 LD	--	1.3 km
1996 SK	Apr 18	67.2 LD	--	1.6 km
2007 HV4	Apr 19	4.8 LD	--	8 m
2011 WV134	Apr 28	38.6 LD	--	1.8 km
1992 JD	May 2	9.5 LD	--	43 m

Notes: 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.