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64 Draconis

64 Draconis

Location of 64 Draconis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Draco
Right ascension	20h01m 28.65587s[1]
Declination	+64° 49′ 15.5038″[1]
Apparent magnitude (V)	5.27[2]
Characteristics
Evolutionary stage	red giant
Spectral type	M1 III[3]
B−V color index	1.598±0.006[4]
Astrometry
Radial velocity (Rv)	−36.12±0.13[4] km/s
Proper motion (μ)	RA: −24.818[1] mas/yr Dec.: +33.623[1] mas/yr
Parallax (π)	7.2102 ± 0.1296 mas[1]
Distance	452 ± 8 ly (139 ± 2 pc)
Absolute magnitude (MV)	−1.05[4]
Details
Radius	65[1] R☉
Luminosity	926[1] L☉
Temperature	3,952[1] K
Other designations
e Draconis, 64 Dra, BD+64°1405, FK5 3604, HD 190544, HIP 98583, HR 7676, SAO 18658[5]
Database references
SIMBAD	data

64 Draconis is a single^[6] star in the northern circumpolar constellationofDraco, located 452 light years away.^[1] It has the Bayer designationofe Draconis; 64 Draconis is the Flamsteed designation. The object is visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 5.27.^[2] It is moving closer to the Earth with a heliocentric radial velocity of −36 km/s, and it is predicted to come as close as 204 ly in around 4.3 million years.^[4]

This is an evolved red giant star with a stellar classification of M1 III,^[3] currently on the asymptotic giant branch.^[7] It has expanded to about 65 times the Sun's radius and is radiating 926 times the Sun's luminosity from its photosphere at an effective temperatureof3952 K. 64 Draconis forms a faint naked-eye pair with 65 Draconis 12′ away. The latter is a suspected variable with a brightness range in the Hipparcos photometric filter of 5.29 to 5.33.^[8]

InChinese astronomy, it belongs to the 天廚 (Tiān Chú) (Celestial Kitchen) asterism.^{[citation needed]}

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