Near Earth Asteroids Potentially Hazardous Asteroids (PHAs) are - TopicsExpress



          

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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