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 July 18, 2013 there were 1397 potentially hazardous asteroids. Recent & Upcoming Earth-asteroid encounters: Asteroid Date(UT) Miss Distance Size 2013 NJ4 Jul 7 3.9 LD 14 m 2001 PJ9 Jul 17 29.2 LD 1.1 km 2006 BL8 Jul 26 9.3 LD 48 m 2003 DZ15 Jul 29 7.6 LD 153 m 2005 WK4 Aug 9 8.1 LD 420 m 1999 CF9 Aug 23 24.7 LD 1.1 km 2002 JR9 Aug 31 63.5 LD 1.4 km 1992 SL Sep 23 70 LD 1.1 km 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.
Posted on: Thu, 18 Jul 2013 04:32:12 +0000
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