26 Draconis

26 Draconis
Observation data
Epoch 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] km/s
Proper motion (μ) RA: 277.02[1] mas/yr
Dec.: –524.88[1] mas/yr
Parallax (π)70.47 ± 0.37 mas[1]
Distance46.3 ± 0.2 ly
(14.19 ± 0.07 pc)
Absolute magnitude (MV)4.58±0.011[5]
Orbit[6]
Primary26 Dra A
Companion26 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)
(secondary)		307°
Details
Mass1.30/0.83[7] M☉
Surface gravity (log g)4.50[8] cgs
Temperature6,000[8] K
Metallicity [Fe/H]-0.18[9] dex
Rotational velocity (v sin i)10[10] km/s
Age8.4–11.5[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 15224
Database references
SIMBADAB
C

26 Draconis is a triple star system[12] in the 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] A 1962 study estimated the masses of these two stars as 1.30 and 0.83 times the mass of the Sun, respectively.[7] The stars are considered moderately metal-poor compared to the Sun, which means they have a lower proportion of elements other than hydrogen or helium.[9]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aaass65_2_405 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj81_245 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference wilson1953 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference park2013 was invoked but never defined (see the help page).
  6. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 30 April 2017. Retrieved 25 March 2017.
  7. ^ a b Cite error: The named reference aj67 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference apj131 was invoked but never defined (see the help page).
  9. ^ 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.
  10. ^ Cite error: The named reference bernacca1970 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ 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.