Saturday, 31 August 2019

Asteroid 2019 QU3 passes the Earth.

Asteroid 2019 QU3 passed by the Earth at a distance of about 670 000 km (1.74 times the average  0distance between the Earth and the Moon, or 0.45% of the distance between the Earth and the Sun), at about 1.40 pm GMT on Saturday 24 August 2019. There was no danger of the asteroid hitting us, though were it to do so it would not have presented a significant threat. 2019 QU3 has an estimated equivalent diameter of 3-11 m (i.e. it is estimated that a spherical object with the same volume would be 3-11 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 more than 30 km above the ground, with only fragmentary material reaching the Earth's surface.

 The calculated orbit of 2019 QU3. JPL Small Body Database.

2019 QU3 was discovered on 27 August 2019 (three days after its closest approach to the Earth)  by the University of Hawaii's PANSTARRS telescope. The designation 2019 QU3 implies that it was the 92nd asteroid (asteroid U3 - 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 U3 = 20 + (24 X 3) = 92) discovered in the second half of August 2019 (period 2019 Q).
 
2019 QU3 has a 927 day orbital period and an eccentric orbit tilted at an angle of 0.74° 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 2.71 AU from the Sun (i.e. 271% of the average distance at which the Earth orbits the Sun, and considerably outside the orbit of 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). This means that 2019 QU3 has occasional close encounters with the planet Earth, with the last having occurred in June 2014.
 
See also...
 
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
https://sciencythoughts.blogspot.com/2019/08/asteroid-2019-on3-passes-earth.htmlhttps://sciencythoughts.blogspot.com/2019/07/asteroid-2019-od-passes-earth.html
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