Gliese 208 information

Gliese 208
	; A visual band light curve for V2689 Orionis, adapted from Kiraga (2012)
Observation data; Epoch J2000 Equinox J2000
Constellation	Orion
Right ascension	05h 36m 30.991s
Declination	+11° 19′ 40.33″
Apparent magnitude (V)	8.80 - 9.05
Characteristics
Spectral type	M0.0 Ve
Variable type	RS CVn
Astrometry
Radial velocity (Rv)	21.772 km/s
Proper motion (μ)	RA: −2.811 ± 0.080 mas/yr ; Dec.: −56.368 ± 0.060 mas/yr
Parallax (π)	87.66 ± 0.29 mas
Distance	37.2 ± 0.1 ly ; (11.41 ± 0.04 pc)
Absolute magnitude (MV)	8.6
Details
Mass	0.646 M☉
Radius	0.601 R☉
Luminosity	0.08 L☉
Temperature	3,966 K
Metallicity [Fe/H]	+0.05 dex
Age	2.7 Gyr
Other designations
	Gliese 208, Gj 208, V2689 Orionis, BD+11°878, HIP 26335, HD 245409, TYC 709-63-1, SAO 94695
Database references
SIMBAD	data

Gliese 208 (Gj 208) is a red dwarf star with an apparent magnitude of 8.9. It is 37 light years away in the constellation of Orion. It is an extremely wide binary with 2MASS J0536+1117, an M4 star 2.6 arcminutes away (at least 0.028 light years)

The spectral type of Gj 208 has variously been described between K6 and M1.^[8]^[9]^[10] Two of the most recent observations give a statistically calculated spectral type of K7.9^[6] or a more traditional classification of M0.0 Ve.^[4] It is a cool dwarf star and probably a spectroscopic binary.^[3]

Calculations from 2010 suggest that this star passed as close as 1.537 parsecs (5.0 light-years) from the Sun about 500,000 years ago.^[11]

GJ 208 is an RS Canum Venaticorum variable, close binary systems which show small amplitude brightness changes caused by chromospheric activity. Its visual magnitude varies by about a quarter magnitude with a period of 12.285 days.^[3]

^ Cite error: The named reference Kiraga was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally Published in: Astron. Astrophys. 1337. Bibcode:2016yCat.1337....0G.
^ ^a ^b ^c ^d Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ ^a ^b Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.
^ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Crifo, F.; Udry, S.; Hestroffer, D.; Katz, D. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: A64. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. S2CID 56094559.
^ ^a ^b ^c ^d ^e ^f Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 64. arXiv:1501.01635. Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. S2CID 19269312.
^ Cite error: The named reference mcdonald was invoked but never defined (see the help page).
^ Stephenson, C. B. (1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". Astronomical Journal. 92: 139. Bibcode:1986AJ.....92..139S. doi:10.1086/114146.
^ Stephenson, C. B.; Sanduleak, N. (1975). "Dwarf K and M stars discovered on objective-prism plates". Astronomical Journal. 80: 972. Bibcode:1975AJ.....80..972S. doi:10.1086/111829.
^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
^ Bobylev, Vadim V. (March 2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. arXiv:1003.2160. Bibcode:2010AstL...36..220B. doi:10.1134/S1063773710030060. S2CID 118374161.

[Kiraga-1] Cite error: The named reference Kiraga was invoked but never defined (see the help page).

[dr1-2] Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally Published in: Astron. Astrophys. 1337. Bibcode:2016yCat.1337....0G.

[gcvs-3] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[lepine-4] Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.

[5] Soubiran, C.; Jasniewicz, G.; Chemin, L.; Crifo, F.; Udry, S.; Hestroffer, D.; Katz, D. (2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: A64. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. S2CID 56094559.

[mann-6] ^ ^a ^b ^c ^d ^e ^f Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 64. arXiv:1501.01635. Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. S2CID 19269312.

[mcdonald-7] Cite error: The named reference mcdonald was invoked but never defined (see the help page).

[8] Stephenson, C. B. (1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". Astronomical Journal. 92: 139. Bibcode:1986AJ.....92..139S. doi:10.1086/114146.

[9] Stephenson, C. B.; Sanduleak, N. (1975). "Dwarf K and M stars discovered on objective-prism plates". Astronomical Journal. 80: 972. Bibcode:1975AJ.....80..972S. doi:10.1086/111829.

[mk-10] Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.

[Bobylev:arXiv1003.2160-11] Bobylev, Vadim V. (March 2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. arXiv:1003.2160. Bibcode:2010AstL...36..220B. doi:10.1134/S1063773710030060. S2CID 118374161.

Observation data Epoch J2000 Equinox J2000
A visual band light curve for V2689 Orionis, adapted from Kiraga (2012)^[1]
Constellation	Orion
Right ascension	05^h 36^m 30.991^s^[2]
Declination	+11° 19′ 40.33″^[2]
Apparent magnitude (V)	8.80 - 9.05^[3]
Characteristics
Spectral type	M0.0 Ve^[4]
Variable type	RS CVn^[3]
Astrometry

Radial velocity (R_v)	21.772^[5] km/s
Proper motion (μ)	RA: −2.811 ± 0.080^[2] mas/yr Dec.: −56.368 ± 0.060^[2] mas/yr
Parallax (π)	87.66 ± 0.29 mas^[2]
Distance	37.2 ± 0.1 ly (11.41 ± 0.04 pc)
Absolute magnitude (M_V)	8.6

Details

Mass	0.646^[6] `M`_☉
Radius	0.601^[6] `R`_☉
Luminosity	0.08^[7] `L`_☉
Temperature	3,966^[6] K
Metallicity [Fe/H]	+0.05^[6] dex
Age	2.7^[6] Gyr

Other designations
Gliese 208, Gj 208, V2689 Orionis, BD+11°878, HIP 26335, HD 245409, TYC 709-63-1, SAO 94695
Database references
SIMBAD	data

Gliese 208 information

and 29 Related for: Gliese 208 information

Gliese 208

Gliese 876 b

GJ 1245

Tidal locking

Lalande 21185

Omicron1 Orionis

Omicron2 Orionis

Red dwarf

Nu Orionis

Phi2 Orionis

Pi6 Orionis

Tau Orionis

Gliese 784

Phi1 Orionis

Omega Orionis

Pi5 Orionis

Pi4 Orionis

Gliese 179

Xi Orionis

Psi2 Orionis

List of extrasolar candidates for liquid water

Gliese 777

Pi2 Orionis

Pi1 Orionis

List of stars in Indus

List of stars in Centaurus

59 Virginis

List of stars in Puppis

61 Cygni