Gliese 3685 A

Gliese 3685 A

Observation data Epoch J2000      Equinox J2000
Constellation	Leo
Right ascension	11^h 47^m 40.74^s
Declination	+00° 15′ 20.2″
Apparent magnitude (V)	13.37
Characteristics
Spectral type	M4V
U−B color index	?
B−V color index	?
Variable type	None
Astrometry
Proper motion (μ)	RA: -311 mas/yr Dec.: -101 mas/yr
Distance	45 ly
Details
Mass	? M☉
Radius	? R☉
Luminosity	? L☉
Temperature	? K
Metallicity	?
Rotation	?
Age	? years
Other designations
2MASS J11474074+0015201, LP 613-49, MGC 24663, LTT 13239, USNO-B1.0 0902-00204368.

Gliese 3685 A is the primary companion of Gliese 3685. It is a very old red dwarf that is also a flare star. A 20-minute flare was observed in 2004 by the GALEX satellite.^[1]

References

1. Robinson, Richard D.; Wheatley, Jonathan M.; Welsh, Barry Y.; Forster, Karl; Morrissey, Patrick; Seibert, Mark; Rich, R. Michael; Salim, Samir; Barlow, Tom A.; Bianchi, Luciana; Byun, Yong-Ik; Donas, Jose; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young-Wook; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Neff, Susan G.; Schiminovich, David; Siegmund, Oswald H. W.; Small, Todd; Szalay, Alex S.; Wyder, Ted K. (2005). "GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A". The Astrophysical Journal 633 (1): 447–51. arXiv:astro-ph/0507396. Bibcode:2005ApJ...633..447R. doi:10.1086/444608.

• "GJ 3685 A -- Flare Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg.