Gliese 282

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Gliese 228
Observation data
Epoch J2000      Equinox 2000
Constellation Monoceros
Right ascension 06h 10m 54.80387s[1]
Declination 10° 19′ 04.9946″
Apparent magnitude (V) (7.30 + 9.01)[2]
Spectral type K2V[3] + K7V[4] + M1.5Ve[5]
Apparent magnitude (U) 12.9
Apparent magnitude (B) 11.844
Apparent magnitude (V) 10.385
Apparent magnitude (R) 9.365
Apparent magnitude (I) 8.065
Apparent magnitude (J) 6.795
Apparent magnitude (H) 6.306
Apparent magnitude (K) 6.032
Variable type A: BY Dra[6]
Radial velocity (Rv) −18.15[7] km/s
Proper motion (μ) RA: 69.90[1] mas/yr
Dec.: -278.33[1] mas/yr
Parallax (π) 91.65 ± 3.50[1] mas
Distance 36 ± 1 ly
(10.9 ± 0.4 pc)
Gl 228 A
Surface gravity (log g) 4.40[8] cgs
Temperature 4,956[8] K
Metallicity [Fe/H] −0.12[8] dex
Rotational velocity (v sin i) 1.77[6] km/s
Age 300−350[5] Myr
Gl 228 B
Metallicity [Fe/H] −0.25[9] dex
Age 680−720[5] Myr
Other designations
Gl 282, HD 61606, HIP 37349, WDS J07400-0336.[10]
Gl 228 A: BD−03° 2001, SAO 134954
Gl 228 B: BD−03° 2002, SAO 134958
Gl 228 C: G 112-29, NLTT 18149
Database references

Gliese 282 is a triple star system in the equatorial constellation of Monoceros. At a distance of 36 light years, this star has an apparent magnitude of 7.26 when viewed from Earth. It is not visible to the naked eye.

The Gl 282AB star system is composed of two K- type main-sequence stars. The primary component, Gliese 282A, is a BY Draconis type variable star with a stellar classification of K2V. It has an effective temperature of 4,956 K. The companion, Gliese 282B, is a smaller, class K5V star. As of 2003, the pair had an angular separation of 58.30 arc seconds along a position angle of 113°.[2] This is equivalent to a projected physical separation of 824 AU.[5]

There is a distant common proper motion companion (G 112-29) at an angular separation of 1.09°. At the estimated distance of Gl 282AB, this corresponds to a projected separation of 55,733 AU, making it one of the widest known physical companions. It is a red dwarf star with a stellar classification of M1.5Ve.[5]


  1. ^ a b c d van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22. 
  3. ^ Montes, D.; et al. (2001), "Late-type members of young stellar kinematic groups - I. Single stars", Monthly Notices of the Royal Astronomical Society, 328 (1): 45–63, Bibcode:2001MNRAS.328...45M, arXiv:astro-ph/0106537Freely accessible, doi:10.1046/j.1365-8711.2001.04781.x. 
  4. ^ Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770Freely accessible, doi:10.1086/504637. 
  5. ^ a b c d e Poveda, A.; et al. (November 2009), "G 112-29 (=NLTT 18149): A Very Wide Companion to GJ 282 AB with a Common Proper Motion, Common Parallax, Common Radial Velocity, and Common Age", The Astrophysical Journal, 706 (1): 343–347, Bibcode:2009ApJ...706..343P, arXiv:0910.2956Freely accessible, doi:10.1088/0004-637X/706/1/343. 
  6. ^ a b Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, Bibcode:2012A&A...547A.106M, arXiv:1210.6843Freely accessible, doi:10.1051/0004-6361/201118412, A106. 
  7. ^ Nidever, David L; et al. (August 2002), "Radial Velocities for 889 Late-Type Stars", The Astrophysical Journal Supplement Series, 141 (2): 503–522, Bibcode:2002ApJS..141..503N, arXiv:astro-ph/0112477Freely accessible, doi:10.1086/340570. 
  8. ^ a b c Mishenina, T. V.; et al. (April 2013), "Abundances of neutron-capture elements in stars of the Galactic disk substructures", Astronomy & Astrophysics, 552: 12, Bibcode:2013A&A...552A.128M, arXiv:1303.1730Freely accessible, doi:10.1051/0004-6361/201220687, A128. 
  9. ^ Newton, Elisabeth R.; et al. (January 2014), "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs", The Astronomical Journal, 147 (1): 24, Bibcode:2014AJ....147...20N, arXiv:1310.1087Freely accessible, doi:10.1088/0004-6256/147/1/20, 20. 
  10. ^ "HD 61606 -- Variable of BY Dra type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-01-05. 

External links[edit]