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.
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On
May 3, 2011 there were 1218
potentially hazardous asteroids.
May 3, 2011 there were 1218
potentially hazardous asteroids.
Recent
& Upcoming Earth-asteroid encounters:
| Asteroid | Date(UT) | Miss Distance | Mag. | Size |
| 2011 JA | Apr 25 | 1.6 LD | -- | 230 m |
| 2011 GJ3 | Apr 27 | 7.7 LD | -- | 25 m |
| 2008 UC202 | Apr 27 | 8.9 LD | -- | 10 m |
| 2011 HJ | Apr 28 | 5.3 LD | -- | 27 m |
| 2011 HP4 | May 1 | 3.3 LD | -- | 14 m |
| 2009 UK20 | May 2 | 8.6 LD | -- | 23 m |
| 2011 HD24 | May 2 | 5.4 LD | -- | 35 m |
| 2008 FU6 | May 5 | 75.5 LD | -- | 1.2 km |
| 2003 YT1 | May 5 | 65.3 LD | -- | 2.5 km |
| 2011 HC24 | May 12 | 5.9 LD | -- | 63 m |
| 2002 JC | Jun 1 | 57.5 LD | -- | 1.6 km |
| 2009 BD | Jun 2 | 0.9 LD | -- | 10 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 |
| 2011 EZ78 | Jul 10 | 37.3 LD | -- | 1.5 km |
| 2003 YS117 | Jul 14 | 73.9 LD | -- | 1.0 km |
| 2007 DD | Jul 23 | 9.3 LD | -- | 31 m |
| 2009 AV | Aug 22 | 49.7 LD | -- | 1.1 km |
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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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