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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.
http://www.spaceweather.com/
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