Thursday, 5 September 2019

Asteroid 2008 SJ82 passes the Earth.

Asteroid 2008 SJ82  passed by the Earth at a distance of about 10 102 000 km (26.3 times the average distance between the Earth and the Moon, or 6.75% of the distance between the Earth and the Sun), slightly before 0.30 am GMT on Thursday 29 August 2019. There was no danger of the asteroid hitting us, though were it to do so it would have presented a significant threat. 2008 SJ82 has an estimated equivalent diameter of 140-430 m (i.e. it is estimated that a spherical object with the same volume would be 140-430 m in diameter), and an object of this size would be predicted to be capable of passing through the Earth's atmosphere relatively intact, impacting the ground directly with an explosion that would be between about 7500 and 182 000 times as powerful as the Hiroshima bomb. Such an impact would result in an impact crater between 2 and 7 km in diameter and devastation on a global scale, as well as climatic effects that would last decades or even centuries.

 The calculated orbit of 2008 SJ82. JPL Small Body Database.

2008 SJ82 was discovered on 26 September 2008 at Siding Spring Observatory in Australia. The designation 2008 SJ82 implies that it was the 2059th asteroid (asteroid J82 - in numbering asteroids the letters A-Y, excluding I, are assigned numbers from 1 to 24, with a number added to the end each time the alphabet is ended, so that A = 1, A1 = 25, A2 = 49, etc., which means that J82 = 9 + (24 X 82) = 2059) discovered in the second half of September 2008 (period 2008 S).

2008 SJ82 has a 1340 day orbital period and an eccentric orbit tilted at an angle of 9.70° to the plane of the Solar System, which takes it from 1.01 AU from the Sun (i.e. 101% of he average distance at which the Earth orbits the Sun) to 3.75 AU from the Sun (i.e. 375% of the average distance at which the Earth orbits the Sun, roughly two-and-a-half times as far from the Sun as the Planet Mars). It is therefore classed as an Amor Group Asteroid (an asteroid which comes close to the Earth, but which is never closer to the Sun than the Earth is). As an asteroid probably larger than 150 m in diameter that occasionally comes within 0.05 AU of the Earth, 2008 SJ82 is also classified as a Potentially Hazardous Asteroid. Close encounters between the 2008 SJ82 and Earth are extremely common, with the last having happened in September 2008 and the  next predicted in September 2020. 2008 SJ82 also has frequent close encounters with the planet Jupiter, which it is thought to have last passed in December 1991, and which it is next predicted to pass in October 2039 (although in this case 'close encounter' is relative, the asteroid never gets closer to Jupiter than Earth does to the Sun, but this is still close enough for for the giant planet's gravity to potentially affect its path.

See also...

https://sciencythoughts.blogspot.com/2019/09/comet-c2018-w2-africano-approaches.htmlhttps://sciencythoughts.blogspot.com/2019/08/asteroid-2019-qu3-passes-earth.html
http://sciencythoughts.blogspot.com/2019/08/the-alpha-aurigid-meteors.htmlhttp://sciencythoughts.blogspot.com/2019/08/asteroid-2019-om1-passes-earth.html
https://sciencythoughts.blogspot.com/2019/08/asteroid-ps1-passes-earth.htmlhttps://sciencythoughts.blogspot.com/2019/08/the-perseid-meteor-shower.html
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