45 Draconis

This article is about d Draconis and is not to be confused with δ Draconis.

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]

45 Draconis

Location of 45 Dra (circled)
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]