Space Weather

by Dr. Tony Phillips.

All Sky Fireball Network

 

Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA’s Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth’s atmosphere and many other characteristics. Daily results are presented here on Spaceweather.com.

On May. 11, 2014, the network reported 9 fireballs.
(7 sporadics, 2 eta Aquariids)

In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

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 May 14, 2014 there were 1473 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:

Asteroid
Date(UT)
Miss Distance
Size
2014 HT178
May 8
5.9 LD
21 m
2014 JD
May 9
7.7 LD
24 m
2014 JG55
May 10
0.3 LD
7 m
2014 JW55
May 13
4.3 LD
23 m
2014 JH15
May 17
8 LD
59 m
2010 JO33
May 17
4 LD
43 m
2005 UK1
May 20
36.7 LD
1.1 km
1997 WS22
May 21
47.1 LD
1.5 km
2002 JC
May 24
48.7 LD
1.4 km
2014 HQ124
Jun 8
3.2 LD
615 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.

Enhanced by Zemanta
About these ads