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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 Oct. 14, 2015, the network reported 37 fireballs.
(29 sporadics, 5 Southern Taurids, 1 epsilon Geminid, 1 Orionid, 1 lambda Draconid)

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 October 15, 2015 there were 1623 potentially hazardous asteroids.Recent & Upcoming Earth-asteroid encounters:

Asteroid
Date(UT)
Miss Distance
Size
2015 TN21
Oct 10
2.3 LD
17 m
2015 TB25
Oct 11
9.5 LD
55 m
2015 TK21
Oct 12
4.8 LD
24 m
2015 TG24
Oct 12
4 LD
19 m
2015 TC25
Oct 13
0.3 LD
5 m
2015 TC179
Oct 14
12.3 LD
25 m
2015 TG144
Oct 16
13.3 LD
32 m
2011 QD48
Oct 17
67.5 LD
1.0 km
2014 UR
Oct 18
3.8 LD
21 m
2011 SE97
Oct 18
11.9 LD
50 m
2015 TD144
Oct 20
11.7 LD
131 m
2001 UY4
Oct 21
58.2 LD
1.0 km
2015 TZ143
Oct 22
4.2 LD
24 m
2015 TB145
Oct 31
1.3 LD
455 m
2015 TD179
Nov 4
10.6 LD
52 m
2005 UL5
Nov 20
5.9 LD
390 m
2003 EB50
Nov 29
48.8 LD
2.2 km
2007 BG29
Dec 1
54.1 LD
1.1 km
1998 WT24
Dec 11
10.9 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.