GL Virginis

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.

GL Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension  12h 18m 59.3999s[1]
Declination +11° 07′ 33.7702″[1]
Apparent magnitude (V) 13.898[2]
Characteristics
Spectral type M4.5Ve[2]
U−B color index +1.065[3]
B−V color index +1.88[3]
Variable type Flare star
Astrometry
Radial velocity (Rv)5.82[2] km/s
Proper motion (μ) RA: −1269.932±0.192[1] mas/yr
Dec.: 203.617±0.117[1] mas/yr
Parallax (π)154.5077 ± 0.1108[1] mas
Distance21.11 ± 0.02 ly
(6.472 ± 0.005 pc)
Absolute magnitude (MV)14.72[4]
Details
Mass0.12[4] M☉
Radius0.16[5] R☉
Surface gravity (log g)5.0[6] cgs
Temperature3110[6] K
Metallicity [Fe/H]0.17[7] dex
Rotational velocity (v sin i)17[5] km/s
Other designations
GL Vir, G 12-30, GJ 1156, LHS 324, LTT 13440, GCTP 2835.0, LP 494-77, 2MASS J12185939+1107338[2]
Database references
SIMBADdata

Located 21.1 light years away, GL Virginis has a spectral type of M4.5V and an effective temperature of approximately 3110 K.[6] 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[4] and its radius is 16% of the Sun.[5] It is a fairly rapid rotator: its rotational velocity is least 17 km/s,[5] which implies that it takes less than half a day to complete a rotation on its axis.

The closest known star system to GL Virginis is Gliese 486, 6.4 light-years away.[8]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "V* GL Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 December 2016.
  3. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. Cite journal requires |journal= (help)
  4. "The One Hundred Nearest Star Systems". 2012. Retrieved 25 December 2016.
  5. Reiners, A.; et al. (2009). "Evidence for Magnetic Flux Saturation in Rapidly Rotating M Stars". The Astrophysical Journal. 692 (1): 538–545. arXiv:0810.5139. Bibcode:2009ApJ...692..538R. doi:10.1088/0004-637X/692/1/538.
  6. Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4). arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102.
  7. Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1). arXiv:1310.1087. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20.
  8. Stars within 15 light-years of Gliese & Jahreiss 1156 (The Internet Stellar Database)


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