99942 Apophis - Wikipedia
http://en.wikipedia.org/wiki/99942_Apophis
Friday, 13とは、あらまあ、キリスト文化圏的迷信 お日柄が、悪い(^^ゞ
Friday, April 13, 2029 Asteroid Apophis
衝突なし、harmless でもかなり近いような"微妙な"予測が出ました
Apophis is expected to make a record-setting -- but harmless -- close approach to Earth on Friday, April 13, 2029, when it comes no closer than 18,300 miles above Earth's surface. "
http://www.nasa.gov/home/hqnews/2009/oct/HQ_09-232_Apophis_Update.html
ちなみにThe moon is about 238,606 miles , or 384,000 kilometers from Earth.
NASA - NASA Refines Asteroid Apophis' Path Toward Earth
"The information provided a more accurate glimpse of Apophis' orbit well into the latter part of this century.
Among the findings is another close encounter by the asteroid with Earth in 2068 with chance of impact currently at approximately three-in-a-million.
As with earlier orbital estimates where Earth impacts in 2029 and 2036 could not initially be ruled out due to the need for additional data, it is expected that the 2068 encounter will diminish in probability as more information about Apophis is acquired.
Initially, Apophis was thought to have a 2.7 percent chance of impacting Earth in 2029. Additional observations of the asteriod ruled out any possibility of an impact in 2029.
However, the asteroid is expected to make a record-setting -- but harmless -- close approach to Earth on Friday, April 13, 2029, when it comes no closer than 18,300 miles above Earth's surface. "
http://www.nasa.gov/home/hqnews/2009/oct/HQ_09-232_Apophis_Update.html
(The moon is about 384,000 kilometers, or 238,606 miles from Earth.)
Asteroid Watch - jpl.nasa.gov
http://www.jpl.nasa.gov/asteroidwatch/