Chi Draconis information

χ Draconis
	Location of χ Draconis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Draco
Right ascension	18h 21m 03.38255s
Declination	+72° 43′ 58.2518″
Apparent magnitude (V)	3.570
Characteristics
Spectral type	F7V / K0V
U−B color index	−0.06
B−V color index	+0.49
Variable type	Suspected
Astrometry
Radial velocity (Rv)	+32.4 km/s
Proper motion (μ)	RA: +531.21 mas/yr ; Dec.: −349.71 mas/yr
Parallax (π)	120.05 ± 0.15 mas
Distance	27.17 ± 0.03 ly ; (8.33 ± 0.01 pc)
Absolute magnitude (MV)	4.04
Orbit
Primary	χ Dra Aa
Companion	χ 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
Mass	1.029±0.026 M☉
Radius	1.20±0.09 R☉
Luminosity	1.86 L☉
Temperature	6,150±150 K
Metallicity [Fe/H]	−0.41 dex
Rotational velocity (v sin i)	11 km/s
Age	5.3 Gyr
χ Dra Ab
Mass	0.748±0.017 M☉
Radius	0.73±0.11 R☉
Luminosity	0.29 L☉
Temperature	4,940±200 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
Database references
SIMBAD	data

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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Observation data Epoch J2000 Equinox J2000
Location of χ Draconis (circled)
Constellation	Draco
Right ascension	18^h 21^m 03.38255^s^[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 (R_v)	+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]
Distance	27.17 ± 0.03 ly (8.33 ± 0.01 pc)
Absolute magnitude (M_V)	4.04^[2]

Orbit^[6]
Primary	χ Dra Aa
Companion	χ 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
Mass	1.029±0.026^[3] `M`_☉
Radius	1.20±0.09^[3] `R`_☉
Luminosity	1.86^[3] `L`_☉
Temperature	6,150±150^[3] K
Metallicity [Fe/H]	−0.41^[2] dex
Rotational velocity (v sin i)	11^[7] km/s
Age	5.3^[2] Gyr
χ Dra Ab
Mass	0.748±0.017^[3] `M`_☉
Radius	0.73±0.11^[3] `R`_☉
Luminosity	0.29^[3] `L`_☉
Temperature	4,940±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
SIMBAD	data

Chi Draconis information

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