２０１２ＤＡ１４

45 m diameter asteroid approaches the Earth at 8 km per second, 16 early Saturday morning Japan time, passing through the closer to the earth than geostationary satellites, such as sunflower weather satellite. Poised to wait and see about the size of a celestial body as this will be recorded history, and the closest approach, National Aeronautics and Space Administration (NASA) is "likely to hit the Earth is not at all," said.
In February last year, the asteroid is called the sign of "2012DA14" were discovered in the observatories of Spain. Estimated 130 000 tons in weight. Earth is approaching from the direction of Antarctica, 24 minutes at 4:00 am on July 16, expected to be closest to the Earth in the sky above the Indian Ocean. But rather from the ground can not be seen with the naked eye and the darker, according to the National Astronomical Observatory of Japan, it is, can be observed in Japan and if you use a telescope.
At 27.7 thousand km, which corresponds to the two lined earth, the distance from the surface of the earth at the time of closest approach, there is only one of about 13 minutes of the distance to the moon. Closer to the earth than geostationary satellites located 36,000 km altitude on the equator, I come out in the direction of the Arctic skimming above the earth.

Seems to be less likely to hit, considering the mass at a rate of 130 000 tons of pretty, I would hit greater impact because we have a lot of kinetic energy.



直径４５メートルの小惑星が秒速８キロで地球に接近し、日本時間１６日未明、気象衛星ひまわりなどの静止衛星よりも地球に近いところを通過する。これほどの大きさの天体としては観測史上、最接近となるが、米航空宇宙局（ＮＡＳＡ）は「地球にぶつかる恐れは全くない」と静観する構えだ。
　小惑星は昨年２月、スペインの天文台の観測で発見され「２０１２ＤＡ１４」の符号で呼ばれる。重さは推定１３万トン。南極方向から地球に近づいており、１６日午前４時２４分、インド洋上空で地球に最接近する見込み。地上からは肉眼では見えないほど暗いというが、国立天文台によると、望遠鏡を使えば日本でも観測可能としている。
　最接近時の地表からの距離は、地球２個を並べたのに相当する２万７７００キロで、月までの距離の約１３分の１しかない。赤道上の高度３万６千キロにある静止衛星よりも地球に近づき、地球上空をかすめて北極方向に抜ける。
　ぶつかる恐れは少ないようですが、かなりの速度で13万トンの質量を考えると、かなりの運動エネルギーを持っていますからぶつかったら衝撃も大きいでしょうね。