Star in the constellation Draco
26 Draconis
Observation dataEpoch J2000 Equinox J2000
Constellation
Draco
Right ascension 17h 34m 59.59363s [ 1]
Declination
+61° 52′ 28.4006″[ 1]
Apparent magnitude (V)5.236[ 2]
Characteristics
Spectral type
G0Va (F9V + K3V)[ 3]
U−B color index
+0.100[ 2]
B−V color index
+0.595[ 2]
Astrometry Radial velocity (Rv )–12.7[ 4] Proper motion (μ) RA: 277.02[ 1] mas /yr Dec.: –524.88[ 1] mas /yr Parallax (π)70.47 ± 0.37 mas [ 1] Distance 46.3 ± 0.2 ly pc ) Absolute magnitude (MV )± 0.011[ 5] Orbit [ 6] Primary 26 Dra A Companion 26 Dra B Period (P)76.1 yr Semi-major axis (a)1.53″ Eccentricity (e)0.18 Inclination (i)104° Longitude of the node (Ω)151° Periastron epoch (T)1947 Argument of periastron (ω)307° Details Mass 1.30/0.83[ 7] M ☉ Surface gravity (log g )4.50[ 8] cgs Temperature 6,000[ 8] K Metallicity -0.18[ 9] dex Rotational velocity (v sin i )10[ 10] Age 8.4–11.5[ 9] Gyr Other designations BD +61 1678,
WDS J17350+6153,
CCDM J17351+6152
AB : 26 Dra, HD 160269, HIP 86036, HR 6573, LHS 3305, LTT 15223, SAO 17546[ 11] C : HIP 86037, GJ 685, LTT 15224Database references SIMBAD AB C
26 Draconis is a triple star system[ 12] constellation Draco , located 46 light years from the Sun . Two of the system components, A and B, form a spectroscopic binary that completes an orbit every 76 years. The composite spectral classification of the AB pair is G0V, which decomposes to individual spectral types F9V and K3V.[ 3] mass of the Sun , respectively.[ 7] [ 9]
Gliese 685
The third component, GJ 685, is a red dwarf spectral classification of M0V. As of 1970, this star is separated by 737.9 arc seconds from the AB pair and they share a common proper motion .[ 13] [ 14]
space velocity components of 26 Draconis are U = +36.5, V = −4.3 and W = −21.8 km/s.[ 15] Milky Way galaxy that has an eccentricity of 0.14, taking it as close as 23.1 kly (7.08 kpc) and as far as 30.4 kly (9.32 kpc) from the galactic core. The inclination of this orbit carries the star system as much as 0.75 kly (0.23 kpc) above the plane of the galactic disk.[ 16] Ursa Major moving group .[ 17]
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 , S2CID 18759600 . ^ a b c Oja, T. (1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series , 65 (2): 405– 4, Bibcode :1986A&AS...65..405O . ^ a b Edwards, T. W. (April 1976), "MK classification for visual binary components", Astronomical Journal , 81 : 245– 249, Bibcode :1976AJ.....81..245E , doi :10.1086/111879 ^ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication . Washington: Carnegie Institution of Washington . Bibcode :1953GCRV..C......0W . ^ Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal , 146 (4): 73, arXiv :1307.0592 Bibcode :2013AJ....146...73P , doi :10.1088/0004-6256/146/4/73 , S2CID 119187733 . ^ "Sixth Catalog of Orbits of Visual Binary Stars" . United States Naval Observatory . Archived from the original on 30 April 2017. Retrieved 25 March 2017 .^ a b Upgren, A. R. (October 1962). "Parallax and orbital motion of the triple system 26 Draconis from photographs taken with the Sproul 24-inch refractor" . Astronomical Journal . 67 : 539– 543. Bibcode :1962AJ.....67..539U . doi :10.1086/108760 ^ a b Luck, R. Earle; Heiter, Ulrike (June 2006). "Dwarfs in the Local Region" . The Astronomical Journal . 131 (6): 3069– 3092. Bibcode :2006AJ....131.3069L . doi :10.1086/504080 ^ a b c Makarov, V. V.; Zacharias, N.; Hennessy, G. S. (November 2008). "Common Proper Motion Companions to Nearby Stars: Ages and Evolution". The Astrophysical Journal . 687 (1): 566– 578. arXiv :0808.3414 Bibcode :2008ApJ...687..566M . doi :10.1086/591638 . S2CID 17811620 . ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago . 239 (1): 1. Bibcode :1970CoAsi.239....1B . ^ "HD 160269" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2010-02-17 .^ Greaves, J. S.; Wyatt, M. C. (November 2003). "Some anomalies in the occurrence of debris discs around main-sequence A and G stars" . Monthly Notices of the Royal Astronomical Society 345 (4): 1212– 1222. Bibcode :2003MNRAS.345.1212G . doi :10.1046/j.1365-2966.2003.07037.x ^ Lépine, Sébastien; Bongiorno, Bethany (2007). "New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems". The Astronomical Journal . 133 (3): 889– 905. arXiv :astro-ph/0610605 Bibcode :2007AJ....133..889L . doi :10.1086/510333 . S2CID 16800796 . ^ Makarov, V. V.; Zacharias, N.; Hennessy, G. S. (2019). "The HADES RV Programme with HARPS-N at TNG XI. GJ 685 b: A warm super-Earth around an active M dwarf". Astronomy & Astrophysics . A126 : 625. arXiv :1903.11853 Bibcode :2019A&A...625A.126P . doi :10.1051/0004-6361/201834969 . S2CID 85542910 . ^ Soderblom, David R.; Mayor, Michel (January 1993). "Stellar kinematic groups. I - The Ursa Major group" . Astronomical Journal . 105 (1): 226– 249. Bibcode :1993AJ....105..226S . doi :10.1086/116422 ^ Holmberg, J.; Nordström, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics . 501 (3): 941– 947. arXiv :0811.3982 Bibcode :2009A&A...501..941H . doi :10.1051/0004-6361/200811191 . S2CID 118577511 . ^ Greaves, J. S.; Wyatt, M. C.; Bryden, G. (August 2009). "Debris discs around nearby solar analogues" . Monthly Notices of the Royal Astronomical Society . 397 (2): 757–762(6). arXiv :0907.3677 Bibcode :2009MNRAS.397..757G . doi :10.1111/j.1365-2966.2009.15048.x S2CID 17758971 .
