GJ 3379

GJ 3379 (Giclas 99-49) is the nearest star in the Orion constellation, located at a distance of 17 light years from the Sun based on parallax. It is a single star^[3] with an apparent visual magnitude of +11.31^[2] and an absolute magnitude of +12.71,^[3] therefore, the star is not visible with the naked eye. It is positioned in the upper left part of the Orion constellation, to the SSE of Betelgeuse. This star is drifting further away with a radial velocity of +30.0 kilometers per second.^[5] In the past, this star had a relatively close encounter with the Solar System. Some 161,000±6,000 years ago, it achieved a minimum distance of 4.08 ± 0.20 ly (1.25 ± 0.06 pc).^[10]

GJ 3379

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Orion
Right ascension	06h 00m 03.50386s[1]
Declination	+02° 42′ 23.5968″[1]
Apparent magnitude (V)	+11.307[2]
Characteristics
Spectral type	M3.5Ve[3] or dM4.0[4]
B−V color index	1.667[2]
Astrometry
Radial velocity (Rv)	+30.228±0.0038[5] km/s
Proper motion (μ)	RA: +309.487[1] mas/yr Dec.: −40.640[1] mas/yr
Parallax (π)	192.0135±0.0310 mas[6]
Distance	16.986 ± 0.003 ly (5.2080 ± 0.0008 pc)
Absolute magnitude (MV)	+12.71[3]
Details[4]
Mass	0.2312±0.0058 M☉
Radius	0.2457±0.0078 R☉
Luminosity	0.006329±0.000088 L☉
Luminosity (bolometric)	0.0086[7] L☉
Surface gravity (log g)	5.10±0.07 cgs
Temperature	3,284±51 K
Metallicity [Fe/H]	−0.12±0.16 dex
Rotation	1.809 d[8]
Rotational velocity (v sin i)	5.8±0.3[3] km/s
Other designations
GJ 3379, WDS J06001+0242A, G 99-49, G 106-17, LTT 17897, NLTT 15908, PLX 1383.02, TYC 134-605-1, 2MASS J06000351+0242236[9]
Database references
SIMBAD	data
GJ 3379 Location of GJ 3379 in the constellation Orion

Physical characteristics

This star is a small red dwarf with a stellar classification of M3.5V^[3] – an M-type main-sequence star. It is much smaller, cooler, and less massive than the Sun, radiating only 0.6% of the Sun's luminosity.^[4] This is a very active^[11] star that varies in brightness with an amplitude of 0.0074±0.0029 magnitude, modulated by a rapid rotation period of 1.8 days.^[8] The magnetic field strength has been measured as 2.3 kG. It is a source of X-ray emission with a luminosity of 9.5×10²⁷ erg s⁻¹.^[12]

According to the SIMBAD database, the star is classified as an eruptive variable.^[9]