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2004 TN1
is a Near-Earth object and Potentially Hazardous Asteroid discovered on October 5 by NEAT at Mount Palomar. It has the fourth smallest geocentric Minimum Orbital Intersection Distance of any asteroid, after 2008 TC3 which exploded in Earth's atmosphere in 2008, 1994 GV, and 2014 AA which also impacted the Earth in 2014. The asteroid, however, will not make any significant close approaches to Earth in at least the next century.〔
However, its orbit is poorly determined, with only 58 observations over 30 days between October 5 and November 4, 2004, yielding an orbital certainty of 6, with 0 being a well-determined orbit and 9 being an extremely poorly determined orbit. More observations would be needed to determine whether the asteroid may impact the earth in the next several hundred years.
Absolute magnitude estimates guess the asteroid to be approximately 115–260 meters (380–850 feet) in diameter. A theoretical impact into porous rock at 45 degrees, assuming the asteroid to have a density of 2 g/cm3, would yield a crater between 1.7 and 3.2 kilometers wide, slightly larger than Meteor Crater in Arizona.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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