Gliese 3685 A

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Gliese 3685 A
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 47m 40.74s
Declination +00° 15′ 20.2″
Apparent magnitude (V) 13.37
Spectral type M4V
U−B color index  ?
B−V color index  ?
Variable type None
Proper motion (μ) RA: -311 mas/yr
Dec.: -101 mas/yr
Distance 45 ly
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]


  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/0507396Freely accessible. Bibcode:2005ApJ...633..447R. doi:10.1086/444608.