45 Draconis
Star in the constellation Draco
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45 Draconis is a single[9] star located in the northern circumpolar constellation of Draco, around 3,200 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 34.52259s[1] |
| Declination | +57° 02′ 44.1458″[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: 0.068 mas/yr[1] Dec.: −7.961 mas/yr[1] |
| Parallax (π) | 1.0200±0.0583 mas[1] |
| Distance | 3,200 ± 200 ly (980 ± 60 pc) |
| Absolute magnitude (MV) | −3.5[5] |
| Details | |
| Mass | 8.2[3] M☉ |
| Radius | 102[6] R☉ |
| Luminosity | 12,700[6] 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[7] Myr |
| Other designations | |
| d Draconis, 45 Dra, BD+56°2113, FK5 3475, HD 171635, HIP 90905, HR 6978, SAO 31039[8] | |
| Database references | |
| SIMBAD | data |
This star has a stellar classification of F7Ib,[3] matching an F-type supergiant. It is approximately 33 million years old with 8.2 times the mass of the Sun[3] and about 102 times the Sun's radius. The star is radiating 12,700 times the Sun's luminosity from its photosphere[6] at an effective temperature of 6,151 K.[5]