Bark 208

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Stern
Gliese 208
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Orion
Right ascension 05 h 36 m 30.99 s
declination + 11 ° 19 ′ 40.3 ″
Apparent brightness 8.9 likes
Typing
Spectral class K8
Astrometry
parallax 87.44 ± 0.06  mas
distance 37.3  ly
11.4  pc
Physical Properties
Dimensions 0.646  M ☉
radius 0.601  R ☉
Luminosity

0.08  L ☉

Effective temperature 3966  K
Other names
and catalog entries
Bonn survey BD + 11 ° 878
Henry Draper Catalog HD 245409 [1]
Gliese catalog FY 208 [2]
Hipparcos catalog HIP 26335 [3]
SAO catalog SAO 94695 [4]
Tycho catalog TYC 709-63-1 [5]
2MASS catalog 2MASS J05363099 + 1119401 [6]
Other names V2689 Ori

Gliese 208 (Gj 208) is a red dwarf star with an apparent magnitude of 8.9. It is located in the constellation Orion and is currently about 37 light years from the Sun.

The spectral class of Gj 208 is estimated to be between K6 and M1. Two of the most recent observations indicate the statistically calculated spectral class as K7.9 or M0.0Ve. It is a cold dwarf star and probably also a spectroscopic binary star.

Calculations from 2010 have shown that this star passed our solar system about 500,000 years ago at a distance of about 5 light years.

Gj 208 is a RS-Canum-Venaticorum star , a close binary star system which shows slight fluctuations in brightness due to chromospheric activities. Its visible brightness fluctuates by about a quarter of the magnitude within a period of 12,285 days.

See also

Individual evidence

  1. ↑ a b c V2689 Ori. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 26, 2018 .
  2. ↑ CB Stephenson: Dwarf K and M stars of high proper motion found in a hemispheric survey . In: Astronomical Journal . 92, 1986, p. 139. bibcode : 1986AJ ..... 92..139S . doi : 10.1086 / 114146 .
  3. ↑ CB Stephenson, N. Sanduleak: Dwarf K and M stars discovered on objective-prism plates . In: Astronomical Journal . 80, 1975, p. 972. bibcode : 1975AJ ..... 80..972S . doi : 10.1086 / 111829 .
  4. ↑ BA Skiff: VizieR Online Data Catalog: Catalog of Stellar Spectral Classifications (Skiff, 2009-2016) . In: VizieR On-line Data Catalog: B / mk. Originally published in: Lowell Observatory (October 2014) . 1, 2014. bibcode : 2014yCat .... 1.2023S .
  5. ↑ Andrew W. Mann, Gregory A. Feiden, Eric Gaidos, Tabetha Boyajian, Kaspar von Braun: How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius . In: The Astrophysical Journal . 804, 2015, p. 64. arxiv : 1501.01635 . bibcode : 2015ApJ ... 804 ... 64M . doi : 10.1088 / 0004-637X / 804/1/64 .
  6. ↑ Sébastien Lépine, Eric J. Hilton, Andrew W. Mann, Matthew Wilde, Bárbara Rojas-Ayala, Kelle L. Cruz, Eric Gaidos: A Spectroscopic Catalog of the Brightest (J <9) M Dwarfs in the Northern Sky . In: The Astronomical Journal . 145, No. 4, 2013, p. 102. bibcode : 2013AJ .... 145..102L . doi : 10.1088 / 0004-6256 / 145/4/102 .
  7. ↑ a b N. N. Samus, OV Durlevich: VizieR Online Data Catalog: General Catalog of Variable Stars (Samus + 2007-2013) . In: VizieR On-line Data Catalog: B / gcvs. Originally published in: 2009yCat .... 102025S . 1, 2009. bibcode : 2009yCat .... 102025S .
  8. ↑ Vadim V. Bobylev: Searching for Stars Closely Encountering with the Solar System . In: Astronomy Letters . 36, No. 3, March 2010, pp. 220-226. arxiv : 1003.2160 . bibcode : 2010AstL ... 36..220B . doi : 10.1134 / S1063773710030060 .