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  On Dec. 14, 2016, the network reported 146 fireballs.

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Super Elite

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PostSubject: On Dec. 14, 2016, the network reported 146 fireballs.   Wed Dec 14, 2016 11:30 pm


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 Dec. 14, 2016, the network reported 146 fireballs.
(98 Geminids, 45 sporadics, 2 December Monocerotids, 1)

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 December 15, 2016 there were 1748 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016 xa&orb=1]2016 XA[/url][/size]
Dec 12
7.2 LD
30 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016 xw20&orb=1]2016 XW20[/url][/size]
Dec 13
1.8 LD
20 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016 xa21&orb=1]2016 XA21[/url][/size]
Dec 13
12.7 LD
30 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 ya&orb=1]2015 YA[/url][/size]
Dec 13
9.6 LD
15 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 xx169&orb=1]2015 XX169[/url][/size]
Dec 13
7.5 LD
15 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016 xk18&orb=1]2016 XK18[/url][/size]
Dec 18
5.8 LD
68 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 yq1&orb=1]2015 YQ1[/url][/size]
Dec 21
6.2 LD
11 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006 bz7&orb=1]2006 BZ7[/url][/size]
Dec 22
74.5 LD
1.4 km
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015 bb&orb=1]2015 BB[/url][/size]
Jan 18
13.8 LD
45 m
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002 ls32&orb=1]2002 LS32[/url][/size]
Jan 24
53.9 LD
1.0 km
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1991 vk&orb=1]1991 VK[/url][/size]
Jan 25
25.2 LD
1.9 km
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000 wn107&orb=1]2000 WN107[/url][/size]
Jan 26
62.3 LD
2.8 km
[size=undefined][url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005 vl1&orb=1]2005 VL1[/url][/size]
Feb 4
9.1 LD
18 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.
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