astro.wikisort.org - Stern

SDSS J121951.45+312849.4 ist ein Brauner Zwerg im Sternbild Haar der Berenike. Er wurde 2006 von Kuenley Chiu et al. entdeckt und gehört der Spektralklasse L8 an.

Brauner Zwerg SDSS J121951.45+312849.4
Beobachtungsdaten Äquinoktium: J2000.0, Epoche: J2000.0
Sternbild	Haar der Berenike
Rektaszension	12h 19m 51,56s
Deklination	+31° 28′ 49,7″
Scheinbare Helligkeit	J-Band: 15,85 mag
Typisierung
Spektralklasse	L8
Physikalische Eigenschaften
Andere Bezeichnungen und Katalogeinträge
Weitere Bezeichnungen: 2MASS J12195156+3128497

Weblinks

• Eintrag bei DwarfArchives.org (englisch)
• Discovery paper: bibcode:2006AJ....131.2722C (englisch)

На других языках

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- [de] 2MASS J12195156+3128497

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[en] 2MASS J12195156+3128497

2MASS J12195156+3128497 (abbreviated to 2MASS J1219+3128) is a rapidly-rotating brown dwarf of spectral class L8, located in the constellation Coma Berenices about 66 light-years from Earth. With a photometrically measured rotation period of 1.14 hours, it is one of the fastest-rotating known brown dwarfs announced by a team of astronomers led by Megan E. Tannock in March 2021. With a rotational velocity of about 80 km/s (50 mi/s), it is approaching the predicted rotational speed limit beyond which it would break apart due to centripetal forces. As a consequence of its rapid rotation, the brown dwarf is slightly flattened at its poles to a similar degree as Saturn, the most oblate planet in the Solar System.[5] Its rapid rotation may enable strong auroral radio emissions via particle interactions in its magnetic field, as observed in other known rapidly-rotating brown dwarfs.[2]

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