Saturday, 17 February 2018

Asteroid 2018 CH2 passes the Earth.

Asteroid 2018 CH2 passed by the Earth at a distance of about 787 000 km (2.05 times the average distance between the Earth and the Moon, or 0.53% of the distance between the Earth and the Sun), at about 5.50 pm GMT on Monday 12 February 2018. There was no danger of the asteroid hitting us, though were it to do so it would not have presented a significant threat. 2018 CH2 has an estimated equivalent diameter of 4-15 m (i.e. it is estimated that a spherical object with the same volume would be 4-15 m in diameter), and an object of this size would be expected to explode in an airburst (an explosion caused by superheating from friction with the Earth's atmosphere, which is greater than that caused by simply falling, due to the orbital momentum of the asteroid) in the atmosphere between 43 and 26 km above the ground, with only fragmentary material reaching the Earth's surface.

The calculated orbit of 2018 CH2. Minor Planet Center.

2018 CH2 was discovered on 8 February 2018 (four days before its closest approach to the Earth) by the University of Arizona's Mt. Lemmon Survey at the Steward Observatory on Mount Lemmon in the Catalina Mountains north of Tucson. The designation 2018 CH2 implies that the asteroid was the 58th object (object H2) discovered in the first half of February 2018 (period 2018 C).  

2018 CH2 has a 1095 day orbital period and an eccentric orbit tilted at an angle of 5.47° to the plane of the Solar System, which takes it from 0.96 AU from the Sun (i.e. 96% of he average distance at which the Earth orbits the Sun) to 3.19 AU from the Sun (i.e. 319% of the average distance at which the Earth orbits the Sun, and slightly more than twice the distance at which the planet Mars orbits the Sun). It is therefore classed as an Apollo Group Asteroid (an asteroid that is on average further from the Sun than the Earth, but which does get closer). This means that the asteroid has occasional close encounters with the Earth, with the last thought to have occurred in January 2015 and the next predicted in February 2024.

See also...

http://sciencythoughts.blogspot.co.uk/2018/02/asteroid-2018-cs1-passes-earth.htmlhttp://sciencythoughts.blogspot.co.uk/2018/02/asteroid-2018-ct-passes-earth.html
http://sciencythoughts.blogspot.co.uk/2018/02/asteroid-2018-bt6-passes-earth.htmlhttp://sciencythoughts.blogspot.co.uk/2018/01/asteroid-2018-bn6-passes-earth.html
http://sciencythoughts.blogspot.co.uk/2018/01/comet-c2016-t3-panstarrs-makes-its.htmlhttp://sciencythoughts.blogspot.co.uk/2018/01/comet-74psmirnova-chernykh-reaches.html
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