Thursday, 2 November 2017

Southern Taurids to peak on Saturday 4 November 2017.

The Southern Taurid Meteor Shower will  peak on Saturday 4 November 2017, the first of two overlapping meteor showers associated with Comet 2P/Encke that peak in early November, the second being the Northern Taurids which will peak on Saturday 11 November. The showers take their name from the constellation of Taurus, where their radiant point (the point from which they appear to radiate) can be found. However viewing of the Southern Taurids is unlikely to be good this year, as the shower only produces about 5 meteors per hour at peak, and the peak coincides with the Full Moon on Friday 3 November this year.

The radiant points of the Northern and Southern Taurids. Starry Night/Space.com.

The Taurid Showers are caused by the Earth passing through the trail of Comet 2P/Encke, this is particularly spread out, so that the Earth takes several weeks to pass through it. This is thought to be because Encke is a remnant of a much larger Comet, which has broken up over the past 20 000 to 30 000 years, giving a long, spread-out debris stream that has been shepherded into two main substreams by tidal interactions with the Earth.

Image of 2P/Encke taken on 21 Februart 2017 with the Pearl Telescope at the Tenagra Observatory in Arizon. The image is a composite of six 60-second exposures. Gianluca Masi/Virtual Telescope/Michael Schwartz/Tenagra Observatory.

Comet 2P/Encke was first observed by French astronomer Pierre Méchain in 1786, but gets its name from the German astronomer Johann Franz Encke, who calculated its orbit in 1818. The designation 2/ implies that it was the second Periodic Comet (comet with an orbital period of less than 200 years) ever discovered.

The orbit and current position of Comet 2P/Encke. The Sky Live 3D Solar System Simulator.

Comet 2P/Encke completes one orbit every 1204 days (3.3 years) on an eccentric orbit tilted at 11.8° to the plane of the Solar System, that takes it from 0.34 AU from the Sun (34% of the average distance at which the Earth orbits the Sun, and inside the orbit of the planet Mercury) to 4.09 AU from the Sun (4.09 times as far from the Sun as the Earth,considerably more than twice the distance at which the planet Mars orbits the Sun).  

See also...

http://sciencythoughts.blogspot.co.uk/2017/10/fireball-over-long-island-new-york.html
http://sciencythoughts.blogspot.co.uk/2017/10/meteorite-hits-shop-in-paarl-western.html

http://sciencythoughts.blogspot.co.uk/2017/10/fireball-meteor-over-yunnan-province.html
http://sciencythoughts.blogspot.co.uk/2017/10/the-orionid-metoer-shower.html
http://sciencythoughts.blogspot.co.uk/2017/10/meteorite-blamed-for-brush-fire-near.html
http://sciencythoughts.blogspot.co.uk/2017/10/the-draconid-meteor-shower.html


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