ASTEROID FLYING BY EARTH

ASTEROID FLYING BY EARTH HAS A MOON: Yesterday, Jan. 7th, near-Earth asteroid 2016 AZ8 flew past the Earth-Moon system only 2.8 million miles away. Astronomers at the giant Arecibo radar in Puerto Rico pinged the space rock as it approached. Using a pulsed beam of radio energy at 2380 MHz, they found that 2016 AZ8 has a moon:

http://www.spaceweather.com/

The radar team says the primary is nearly spherical with a diameter of 430 meters, while the asteroid's moon is more elongated, shaped like a cigar measuring 180 meters on its long axis.
Binary asteroids are not as rare as you might suppose. Studies show that about 15% of the near-Earth asteroid population has a moon. In the geological past, these systems have struck Earth, creating double impact craters such as the twin crater in Jämtland, Sweden. This story is still being updated.
Realtime Aurora Photo Gallery

http://www.spaceweather.com/

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