Gliese 208 - Misplaced Pages

Red dwarf star in the constellation Orion

Gliese 208
Observation data Epoch J2000 Equinox J2000
A visual band light curve for V2689 Orionis, adapted from Kiraga (2012)
Constellation	Orion
Right ascension	05 36 30.991
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 (R_v)	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 (M_V)	8.6

Details

Mass	0.646 `M`_☉
Radius	0.601 `R`_☉
Luminosity	0.08 `L`_☉
Temperature	3,966 K
Metallicity	+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. Two of the most recent observations give a statistically calculated spectral type of K7.9 or a more traditional classification of M0.0 Ve. It is a cool dwarf star and probably a spectroscopic binary.

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.

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.

References

Kiraga, M. (March 2012). "ASAS Photometry of ROSAT Sources. I. Periodic Variable Stars Coincident with Bright Sources from the ROSAT All Sky Survey". Acta Astronomica. 62 (1): 67–95. arXiv:1204.3825. Bibcode:2012AcA....62...67K. Archived from the original on 4 March 2023. Retrieved 10 February 2022.
^ 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. doi:10.26093/cds/vizier.1337.
^ 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.
^ 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.
^ 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, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
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.

External links

Wikisky image Archived 2012-10-11 at the Wayback Machine of HD 245409 (Gliese 208)

Constellation of Orion

Stars

Bayer	α (Betelgeuse) β (Rigel) γ (Bellatrix) δ (Mintaka) ε (Alnilam) ζ (Alnitak) η (Algjebba) θ A B C D E F G H θ ι (Hatysa) κ (Saiph) λ (Meissa) μ ν ξ ο ο π π π (Tabit) π π π ρ σ τ υ (Thabit) φ φ χ χ ψ ψ ω
Flamsteed	5 6 (g) 11 13 14 (i) 15 16 (h) 18 21 22 (o) 23 (m) 27 (p) 29 (e) 31 32 (A) 33 35 38 42 (c) 45 49 (d) 51 (b) 52 55 56 57 59 60 63 64 66 68 69 (f) 71 72 (f) 73 74 (k) 75 (l)
Variable	S U W UX VV BF BM DN FU GW V380 V883 V1005 V1149 V1201 V1352 V2247 V2254 V2384
HR	1759 1763 1874 1887 1952 1988 2007 2024 2251 2275
HD	33636 34445 37320 37605 42618 43317 290327
Other	4U 0614+091 CVSO 30 CWISE J0506+0738 Gliese 179 Gliese 205 Gliese 208 Gliese 221 GJ 3379 HOPS 383 LP 658-2 PDS 110 S Ori 52 S Ori 70 WISE J0457−0207 WISE J0521+1025

Exoplanets	HD 34445 b HD 37605 b HD 38529 b HD 290327 b

Star
clusters

NGC	1662 1980 1981 2169 2175 2194 2202
Other	Lambda Orionis Cluster Trapezium Cluster (θ)

Nebulae

NGC	1788 1999 2022 2023 2064 2067 2071 2174
Other	Abell 12 Abell 13 Barnard 30 Becklin–Neugebauer Object Flame Nebula HH 1/2 HH 24-26 HH 34 HH 111 Horsehead Nebula IC 434 IC 2118 LDN 1641 McNeil's Nebula Messier 43 Messier 78 Orion Nebula

Galaxies

NGC	1683 1719 1819 1924 2110 2119
Other	4C +09.17 CGCG 396-2 II Zwicky 28 PKS 0458-020 PKS 0528+134 TXS 0506+056

Astronomical events	GRB 991216