Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Draco |
Right ascension | 20h 01m 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 | |
Database references | |
SIMBAD | data |
64 Draconis is a single [6] star in the northern circumpolar constellation of Draco, located 452 light years away. [1] It has the Bayer designation of e 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 temperature of 3952 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]
In Chinese astronomy, it belongs to the 天廚 (Tiān Chú) ( Celestial Kitchen) asterism.[ citation needed]