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Scholz's star : ウィキペディア英語版
Scholz's star


Scholz's star (WISE designation WISE 0720−0846 or fully WISE J072003.20−084651.2) is a dim binary stellar system about from the Sun in the southern constellation Monoceros near the galactic plane.〔 It was discovered in 2013 by astronomer Ralf-Dieter Scholz.
Scholz's star passed through the Solar System's Oort cloud approximately 70,000 years ago.
==Characteristics==
The primary is a red dwarf with a stellar classification of M and has Jupiter masses.〔 The secondary is probably a T5 brown dwarf with Jupiter masses.〔 The system has 0.15 solar masses.〔 The pair orbit at a distance of about .〔 The system has an apparent magnitude of 18.3,〔 and is estimated to be between 3 and 10 billion years old.〔 With a parallax of 166 mas (0.166 arcseconds), there are about 80 known star systems closer to the Sun.〔 It is a late discovery, as far as nearby stars go, because past efforts concentrated on high-proper-motion objects.

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