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[1] mas |
| Distance | 46.3 ± 0.2 ly (14.19 ± 0.07 pc) |
| Orbit[5] | |
| Primary | 26 Dra A |
| Companion | 26 Dra B |
| Period (P) | 76.1 yr |
| Eccentricity (e) | 0.18 |
| Details | |
| Mass | 1.30/0.83[6] M☉ |
| Surface gravity (log g) | 4.50[7] cgs |
| Temperature | 6,000[7] K |
| Metallicity [Fe/H] | -0.18[8] dex |
| Rotational velocity (v sin i) | 10[9] km/s |
| Age | 8.4–11.5[8] Gyr |
| Other designations | |
26 Draconis is a triple star system[11] 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.[6] 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.[8]
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.[8] The space velocity components of 26 Draconis are U = +36.5, V = −4.3 and W = −21.8 km/s.[12] This system is on an orbit through the Milky Way galaxy that has an eccentricity of 0.14, taking it as close as Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). and as far as Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). from the galactic core. The inclination of this orbit carries the star system as much as Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). above the plane of the galactic disk.[13] This system may be a member of the Ursa Major moving group.[14]
References
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