| 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, 2011 there were 1204 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
 |
|
| Asteroid |
Date(UT)
|
Miss Distance
|
Mag.
|
Size
|
| 2011 EC |
Mar 6
|
9.2 LD
|
—
|
34 m
|
| 2011 EO11 |
Mar 6
|
1.8 LD
|
—
|
15 m
|
| 2011 EY11 |
Mar 7
|
0.3 LD
|
—
|
9 m
|
| 2011 EC12 |
Mar 8
|
3.3 LD
|
—
|
28 m
|
| 2000 PN9 |
Mar 10
|
45.5 LD
|
—
|
2.6 km
|
| 2011 BE38 |
Apr 10
|
48 LD
|
—
|
1.0 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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