Gliese 179

Gliese 179
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Orion
Right ascension	04h 52m 05.73s
Declination	+06° 28′ 35.5″
Apparent magnitude (V)	11.96
Characteristics
Spectral type	M4V
Apparent magnitude (U)	14.791
Apparent magnitude (B)	13.56
Apparent magnitude (R)	10.854
Apparent magnitude (I)	9.334
Apparent magnitude (J)	7.814
Apparent magnitude (H)	7.209
Apparent magnitude (K)	6.942
U−B color index	1.23
B−V color index	1.60
V−R color index	1.11
R−I color index	1.520
Variable type	none
Astrometry
Radial velocity (Rv)	–9.1 km/s
Proper motion (μ)	RA: 142.98±4.06 mas/yr ; Dec.: −309.39±2.38 mas/yr
Parallax (π)	81.38 ± 4.04 mas
Distance	40 ± 2 ly ; (12.3 ± 0.6 pc)
Absolute magnitude (MV)	11.54
Details
Mass	0.357 M☉
Radius	0.38 R☉
Luminosity	0.016 L☉
Surface gravity (log g)	4.83 cgs
Temperature	3424±16 K
Metallicity [Fe/H]	+0.23±0.17 dex
Other designations
	G 83-37, G 84-15, G 82-52, HIP 22627, LTT 11525, NLTT 14088, Ross 401, Wolf 1539
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data

Gliese 179 is a 12th magnitude M-type main sequence star located approximately 40 light years away in the constellation Orion. This star is smaller, cooler, fainter, and less massive than our Sun. Also its metal content is twice as much as the Sun. In 2009, a gas giant planet was found in orbit around the star.

The Gliese 179 planetary system^[3]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥ 0.82±0.07 $M$ _J	2.41±0.04	2288±59	0.21±0.08	—	—

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
^ ^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". The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.
^ 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.

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[van_Leeuwen2007-1] van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry

[apj748_2_934-2] 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". The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.

[Howard2010-3] 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.

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See also

References