45 Draconis is a single[10] star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth.[1] 45 Draconis is the Flamsteed designation, while it has the Bayer designation of d Draconis. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.78.[2] Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Draco |
Right ascension | 18h 32m 34.52197s[1] |
Declination | +57° 02′ 44.1416″[1] |
Apparent magnitude (V) | 4.78[2] |
Characteristics | |
Spectral type | F7Ib[3] |
B−V color index | +0.59[2] |
Astrometry | |
Radial velocity (Rv) | −12.50[4] km/s |
Proper motion (μ) | RA: 0.400[1] mas/yr Dec.: −7.674[1] mas/yr |
Parallax (π) | 0.9287 ± 0.0913 mas[1] |
Distance | 3,500 ± 300 ly (1,100 ± 100 pc) |
Absolute magnitude (MV) | −3.5[5] |
Details | |
Mass | 8.2[3] M☉ |
Radius | 62[6] R☉ |
Luminosity | 5,450[7] L☉ |
Surface gravity (log g) | 2.1[3] - 2.4[5] cgs |
Temperature | 6,151[5] K |
Metallicity [Fe/H] | −0.04[5] dex |
Rotational velocity (v sin i) | 10[3] km/s |
Age | 33[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Lyubimkov et al. (2012) assigned this star a stellar classification of F7Ib,[3] matching an F-type supergiant. It is approximately 33 million years old with 8.2[3] times the mass of the Sun and about 62[6] times the Sun's radius. The star is radiating 5,450[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,151 K.[5]