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] | |
| Absolute magnitude (MV) | 4.58±0.011[5] | |
Argument of periastron (ω)(secondary) | 307° | |
| Details | ||
Gyr | ||
LTT 15224 | ||
| Database references | ||
| SIMBAD | AB | |
| C | ||
26 Draconis is a triple
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]
Gliese 685
The third component, GJ 685, is a
common proper motion.[13] The Star GJ 685 has one known planet orbit that was detected by radial velocity. [14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.0+1.7−1.8 M🜨 | 0.1344 | 24.160+0.061−0.047 d | — | — | — |
The
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] This system may be a member of the Ursa Major moving group.[17]
References
- ^ S2CID 18759600.
- ^ Bibcode:1986A&AS...65..405O.
- ^ doi:10.1086/111879
- Bibcode:1953GCRV..C......0W.
- 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.
- ^ doi:10.1086/108760.
- ^ doi:10.1086/504080.
- ^ S2CID 17811620.
- Bibcode:1970CoAsi.239....1B.
- ^ "HD 160269". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-17.
- .
- S2CID 16800796.
- S2CID 85542910.
- doi:10.1086/116422.
- S2CID 118577511.
- S2CID 17758971.
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