GL Virginis
Star in the constellation Virgo
From Wikipedia, the free encyclopedia
GL Virginis, also known as G 12-30, is a star in the constellation of Virgo. It is a faint red dwarf, like more than 70% of the stars located within 10 parsecs of the Solar System; its magnitude visual magnitude is 13.898, making it impossible to see with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 18m 59.39973s[2] |
| Declination | +11° 07′ 33.7732″[2] |
| Apparent magnitude (V) | 13.898[3] |
| Characteristics | |
| Spectral type | M5[4] |
| U−B color index | +1.065[5] |
| B−V color index | +1.88[5] |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | 5.82[3] km/s |
| Proper motion (μ) | RA: −1269.771 mas/yr[2] Dec.: 203.444 mas/yr[2] |
| Parallax (π) | 154.6999±0.0445 mas[2] |
| Distance | 21.083 ± 0.006 ly (6.464 ± 0.002 pc) |
| Absolute magnitude (MV) | 14.72[6] |
| Details | |
| Mass | 0.12[6] M☉ |
| Radius | 0.16[7] R☉ |
| Surface gravity (log g) | 5.0[8] cgs |
| Temperature | 3110[8] K |
| Metallicity [Fe/H] | 0.17[9] dex |
| Rotation | 0.491 d[1] |
| Rotational velocity (v sin i) | 17[7] km/s |
| Other designations | |
| GL Vir, GJ 1156, G 12-30, LHS 324, LP 494-77, LTT 13440, PLX 2835.0, 2MASS J12185939+1107338[3] | |
| Database references | |
| SIMBAD | data |
In 1977, Glen J. Veeder and Olav L. Hansen announced that the star, then called GL 12-30, is a variable star.[10] It was given its variable star designation, GL Virginis, in 1981.[11]
Located 21.1 light years away, GL Virginis has a spectral type of M4.5V and an effective temperature of approximately 3110 K.[8] Its luminosity (emitted in the visible section of the electromagnetic spectrum) is only one ten-thousandth compared to the Sun; however, since a significant fraction of its radiation is emitted as invisible infrared light, its bolometric luminosity increases to 0.5% of that of the Sun. Its mass is 12% that of the Sun[6] and its radius is 16% of the Sun.[7] It is a fairly rapid rotator: its rotational velocity is least 17 km/s,[7] which implies that it takes less than half a day to complete a rotation on its axis. The star is emitting frequent flares, with at least five detected by 2019.[4]
The closest known star system to GL Virginis is Gliese 486, 6.4 light-years away.[12]
