Gliese 179
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 04h 52m 05.7323s[1]
Declination +06° 28′ 35.5895″[1]
Apparent magnitude (V) 11.94[2]
Spectral type M2V[3] or M3.5[4]
Apparent magnitude (U) 14.791[2]
Apparent magnitude (B) 13.530[2]
Apparent magnitude (R) 10.85[2]
Apparent magnitude (I) 9.334[2]
Apparent magnitude (J) 7.814±0.024[2]
Apparent magnitude (H) 7.209±0.046[2]
Apparent magnitude (K) 6.942±0.018[2]
U−B color index 1.26[2]
B−V color index 1.590±0.015[2]
V−R color index 1.09[2]
R−I color index 1.52[2]
Radial velocity (Rv)–9.05±0.15[2] km/s
Proper motion (μ) RA: 153.425±0.109[1] mas/yr
Dec.: −306.106±0.063[1] mas/yr
Parallax (π)80.9036 ± 0.0606[1] mas
Distance40.31 ± 0.03 ly
(12.360 ± 0.009 pc)
Absolute magnitude (MV)11.50[2]
Mass0.400±0.005 M[4]
0.357±0.03[5] M
Radius0.400±0.005 R[4]
0.318±0.024 R[6]
0.38±0.02[5] R
Luminosity0.0158±0.0003 L[4]
0.016±0.02[5] L
Surface gravity (log g)4.148[7] cgs
Temperature3,424±16[8] K
Metallicity [Fe/H]+0.36±0.04 dex[9]
+0.30±0.10 dex[5]
+0.12[10] dex
[10] Gyr
Other designations
GJ 179, HIP 22627, G 83-37, 84-15, 82-52, LTT 11525, NLTT 14088, Ross 401, Wolf 1539[11]
Database references
Exoplanet Archivedata
Extrasolar Planets

Gliese 179 is a small red dwarf star with an exoplanetary companion in the equatorial constellation of Orion. It is much too faint to be visible to the naked eye with an apparent visual magnitude of 11.94.[2] The system is located at a distance of 80.9 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of –9 km/s.[2] It is a high proper motion star, traversing the celestial sphere at an angular rate of 0.370·yr−1.[12]

This is an M-type main-sequence star with a stellar classification of M2V.[3] Based on the motion of this star through space, it is estimated to be roughly 4.6 billion years old.[10] It is chromospherically active[5] with a projected rotational velocity of 4 km/s.[7] This star is smaller and less massive than our Sun, but has a higher metal content. It is radiating just 1.6% of the luminosity of the Sun from its photosphere at an effective temperature of 3,424.[8]

In 2009, a Jovian-type planet was found in orbit around the star,[5] one of the few red dwarfs known to harbor a planet of this mass.[10] The radial velocity data suggested there may be an additional companion. At the orbital distance of this planet, it is not expected to be influenced by tidal interactions with the host star.[10] A second candidate planet was reported in 2017 and confirmed in 2019. This is a potential super-Earth with a minimum mass equal to about five times the mass of the Earth.[13]

The Gliese 179 planetary system[5][13]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.82±0.07 MJ 2.41±0.04 2288±59 0.21±0.08
c (unconfirmed) 4.9±2.7 M🜨 0.032±0.003 3.4798+0.0014

See also


  1. ^ a b c d 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. ^ a b c d e f g h i j k l m n o p Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 11925764.
  3. ^ a b Stephenson, C. B. (July 1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". The Astronomical Journal. 92: 139–165. Bibcode:1986AJ.....92..139S. doi:10.1086/114146.
  4. ^ a b c d Schweitzer, A.; et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars". Astronomy & Astrophysics. 625: 16. arXiv:1904.03231. Bibcode:2019A&A...625A..68S. doi:10.1051/0004-6361/201834965. S2CID 102351979. A68.
  5. ^ a b c d e f g Howard, Andrew W.; et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal. 721 (2): 1467–1481. arXiv:1003.3488. Bibcode:2010ApJ...721.1467H. doi:10.1088/0004-637X/721/2/1467. S2CID 14147776.
  6. ^ Houdebine, Éric R.; et al. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.
  7. ^ a b Hojjatpanah, S.; et al. (2019). "Catalog for the ESPRESSO blind radial velocity exoplanet survey". Astronomy & Astrophysics. 629: A80. arXiv:1908.04627. Bibcode:2019A&A...629A..80H. doi:10.1051/0004-6361/201834729. S2CID 199552090.
  8. ^ a b Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF). The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. S2CID 41902340.
  9. ^ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604. A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715. S2CID 119216828.
  10. ^ a b c d e Veyette, Mark J.; Muirhead, Philip S. (August 2018). "Chemo-kinematic Ages of Eccentric-planet-hosting M Dwarf Stars". The Astrophysical Journal. 863 (2): 16. arXiv:1807.06017. Bibcode:2018ApJ...863..166V. doi:10.3847/1538-4357/aad40e. 166.
  11. ^ "Wolf 1539". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-17.
  12. ^ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
  13. ^ a b Tuomi, M.; Jones, H. R. A.; Anglada-Escudé, G.; Butler, R. P.; Arriagada, P.; Vogt, S. S.; et al. (2019). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].

Coordinates: Sky map 04h 52m 05.7273s, +06° 28′ 35.542″