Tuesday, October 30, 2018

Wikipedia article of the day for October 31, 2018

The Wikipedia article of the day for October 31, 2018 is Microscopium.
Microscopium is a minor constellation in the Southern Celestial Hemisphere, one of twelve created in the 18th century by French astronomer Nicolas Louis de Lacaille and one of several depicting scientific instruments.

Its stars are faint and hardly visible from most of the non-tropical Northern Hemisphere. The constellation's brightest star is Gamma Microscopii, of apparent magnitude 4.68, a yellow giant 2.5 times the Sun's mass.

Now around 381 light-years distant, it may have been only 1.14 light-years from the Sun some 3.9 million years ago, possibly disturbing the outer Solar System. Two star systems—WASP-7 and HD 205739—have planets, while two others—the young red dwarf star AU Microscopii and the sunlike HD 202628—have debris disks.

AU Microscopii and the binary red dwarf system AT Microscopii are probably a wide triple system and members of the Beta Pictoris moving group. BO Microscopii, nicknamed "Speedy Mic", is a star with an extremely fast rotation period of 9 hours 7 minutes.

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