| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 13m 53.83332s[1] |
| Declination | +64° 23′ 50.2330″[1] |
| Apparent magnitude (V) | 4.99[2] |
| Characteristics | |
| Spectral type | F5 V[3] + M3[4] |
| B−V color index | +0.40[3] |
| Astrometry | |
| Radial velocity (Rv) | −35.6[3] km/s |
| Proper motion (μ) | RA: +351.73[1] mas/yr Dec.: +351.73[1] mas/yr |
| Parallax (π) | 43.63 ± 0.17 mas[1] |
| Distance | 74.8 ± 0.3 ly (22.92 ± 0.09 pc) |
| Absolute magnitude (MV) | 3.14[3] + 7.4[4] |
| Details[2] | |
| Mass | 1.23±0.15 M☉ |
| Radius | 1.635±0.037 R☉ |
| Luminosity | 4.66±0.12 L☉ |
| Surface gravity (log g) | 4.1±0.5 cgs |
| Temperature | 6,638±83 K |
| Metallicity [Fe/H] | −0.3±0.1 dex |
| Rotational velocity (v sin i) | 8[3] km/s |
| Age | 2.95[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
36 Draconis is a star in the northern constellation Draco. It is faintly visible to the naked eye with an apparent visual magnitude of 4.99.[2] Based upon an annual parallax shift of 43.63[1] mas, it is located about 74.8 light years away. At that distance, the visual magnitude is diminished by an extinction of 0.129 due to interstellar dust.[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.353 arc seconds per year.[7] It is moving closer to the Sun with a radial velocity of −35.6 km/s.[3]
This is an ordinary F-type main-sequence star with a stellar classification of F5 V.[3] It has 1.23 times the mass of the Sun and 1.64 times the Sun's radius.[2] The star is around three[5] billion years old and is spinning with a projected rotational velocity of 8 km/s.[3] It is radiating 4.7 times the Sun's luminosity from its photosphere at an effective temperature of 6,638 K.[2]
Observations carried out in 2010 and 2012 detected a faint companion at an angular separation of 3.3 arcseconds. Judging by the age and magnitude, this is a red dwarf of class M3.[4]
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