Chi Draconis

χ Draconis
Location of χ Draconis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 18h 21m 03.38255s[1]
Declination +72° 43′ 58.2518″[1]
Apparent magnitude (V) 3.570[2]
Characteristics
Spectral type F7V / K0V[3]
U−B color index −0.06[4]
B−V color index +0.49[4]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)+32.4[2] km/s
Proper motion (μ) RA: +531.21[1] mas/yr
Dec.: −349.71[1] mas/yr
Parallax (π)120.05 ± 0.15 mas[3]
Distance27.17 ± 0.03 ly
(8.33 ± 0.01 pc)
Absolute magnitude (MV)4.04[2]
Orbit[6]
Primaryχ Dra Aa
Companionχ Dra Ab
Period (P)0.7680599±0.000061 yr
Semi-major axis (a)0.1244±0.0011″
Eccentricity (e)0.428±0.012
Inclination (i)74.42±0.58°
Longitude of the node (Ω)230.30±0.51°
Periastron epoch (T)1,984.8324±0.0026
Argument of periastron (ω)
(secondary)		119.3±1.1°
Details
χ Dra Aa
Mass1.029±0.026[3] M☉
Radius1.20±0.09[3] R☉
Luminosity1.86[3] L☉
Temperature6,150±150[3] K
Metallicity [Fe/H]−0.41[2] dex
Rotational velocity (v sin i)11[7] km/s
Age5.3[2] Gyr
χ Dra Ab
Mass0.748±0.017[3] M☉
Radius0.73±0.11[3] R☉
Luminosity0.29[3] L☉
Temperature4,940±200[3] K
Other designations
χ Dra, 44 Dra, BD+72°839, FK5 695, Gl 713, HD 170153, HIP 89937, HR 6927, LHS 3379, LTT 15438, SAO 9087, NSV 10749[8]
Database references
SIMBADdata

Chi Draconis (χ Dra, χ Draconis, Chi Draconis) is a magnitude 3.6 binary star in the constellation Draco. It also has the Flamsteed designation 44 Draconis. At a distance of 27 light years, it is one of the forty or so closest stars.

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