Asteroid (2009 TM8)
Will be as close as 0.0024 AU Earth Distance on Oct. 17, 2011
Near Earth Asteroids
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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.
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On September 28, 2011 there were 1250 potentially hazardous asteroids.
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Recent & Upcoming Earth-asteroid encounters:
| Asteroid | Date(UT) | Miss Distance | Mag. | Size |
| 2011 SQ32 | Sep 20 | 7.5 LD | -- | 44 m |
| 2011 SK68 | Sep 21 | 5.8 LD | -- | 13 m |
| 2007 TD | Sep 22 | 6.2 LD | -- | 58 m |
| 2011 SE58 | Sep 27 | 0.6 LD | -- | 13 m |
| 2011 SO5 | Sep 29 | 5.6 LD | -- | 34 m |
| 2002 AG29 | Oct 9 | 77.1 LD | -- | 1.0 km |
| 2011 SE97 | Oct 12 | 7.9 LD | -- | 52 m |
| 2011 SS25 | Oct 12 | 70 LD | -- | 1.2 km |
| 2000 OJ8 | Oct 13 | 49.8 LD | -- | 2.4 km |
| 2009 TM8 | Oct 17 | 0.9 LD | -- | 8 m |
| 2011 FZ2 | Nov 7 | 75.9 LD | -- | 1.6 km |
| 2005 YU55 | Nov 8 | 0.8 LD | -- | 175 m |
| 1994 CK1 | Nov 16 | 68.8 LD | -- | 1.5 km |
| 1996 FG3 | Nov 23 | 39.5 LD | -- | 1.1 km |
| 2003 WM7 | Dec 9 | 47.6 LD | -- | 1.5 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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| Essential web links |
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 | NOAA Space Weather Prediction Center |
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| The official U.S. government space weather bureau |
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| Atmospheric Optics |
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| The first place to look for information about sundogs, pillars, rainbows and related phenomena. |
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| Solar Dynamics Observatory |
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| Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever. |
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| STEREO |
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| 3D views of the sun from NASA's Solar and Terrestrial Relations Observatory |
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| Solar and Heliospheric Observatory |
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| Realtime and archival images of the Sun from SOHO. |
| Daily Sunspot Summaries |
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| from the NOAA Space Environment Center |
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| Heliophysics |
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| the underlying science of space weather |
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| Science Central |
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| Conquest Graphics |
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| for out-of-this-world printing and graphics |
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| Trade Show Displays |
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| more links... |
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