Near Earth Asteroids

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 5, 2011 there were 1203 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:

Asteroid	Date(UT)	Miss Distance	Mag.	Size
2011 EB	Feb 26	2.4 LD	--	18 m
2011 DQ	Feb 26	9.7 LD	--	26 m
2011 DT9	Feb 27	9 LD	--	39 m
2011 DE5	Mar 1	4.9 LD	--	22 m
2011 DW4	Mar 3	6.9 LD	--	15 m
2011 EC	Mar 6	9.2 LD	--	33 m
2000 PN9	Mar 10	45.5 LD	--	2.6 km
2002 DB4	Apr 15	62.5 LD	--	2.2 km
2008 UC202	Apr 27	8.9 LD	--	10 m
2009 UK20	May 2	8.6 LD	--	23 m
2008 FU6	May 5	75.5 LD	--	1.2 km
2003 YT1	May 5	65.3 LD	--	2.5 km
2002 JC	Jun 1	57.5 LD	--	1.6 km
2009 BD	Jun 2	0.9 LD	--	9 m
2002 JB9	Jun 11	71.5 LD	--	3.2 km
2001 VH75	Jun 12	42.2 LD	--	1.1 km
2004 LO2	Jun 15	9.9 LD	--	48 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.

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