26 Draconis

Stellar classification



  • X -39
  • Y 25
  • Z -1
→ Sol: 46

Object type

  • Spectroscopic binary
  • Star
  • Double or multiple star
  • Infra-Red source
  • High proper-motion Star
  • UV-emission source
  • X-ray source
simbad:* 26 Dra


26 Draconis is a triple star system 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. A 1962 study estimated the masses of these two stars as 1.30 and 0.83 times the mass of the Sun, respectively. 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.

The third component, GJ 685, is a red dwarf spectral classification of M1V. As of 1970, this star is separated by 12.2 arc seconds with the AB pair and they share a common proper motion. The space velocity components of 26 Draconis are U = +36.5, V = −4.3 and W = −21.8 km/s. This system is on an orbit through the 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. This system may be a member of the Ursa Major moving group.

This article uses material from the Wikipedia article "26 Draconis", which is released under the Creative Commons Attribution-Share-Alike License 3.0.