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 km/s[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Location of GJ 3379 in the constellation Orion |
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]
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]