64 Draconis
Star in the constellation Draco
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64 Draconis is a single[10] 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.[5]
 | |
| 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 | AGB[3] |
| Spectral type | M1 III[4] |
| B−V color index | 1.598±0.006[5] |
| Astrometry | |
| Radial velocity (Rv) | −36.12±0.13[5] 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[5] |
| Details | |
| Mass | 1.36[6] M☉ |
| Radius | 68[7] R☉ |
| Luminosity | 967[7] L☉ |
| Surface gravity (log g) | 1.16[8] cgs |
| Temperature | 4,134[8] K |
| Metallicity [Fe/H] | −0.89[8] dex |
| Age | 5.4[8] Gyr |
| Other designations | |
| e Draconis, 64 Dra, BD+64°1405, FK5 3604, HD 190544, HIP 98583, HR 7676, SAO 18658[9] | |
| Database references | |
| SIMBAD | data |
This is an evolved red giant star with a stellar classification of M1 III,[4] currently on the asymptotic giant branch.[3] It has expanded to about 68 times the Sun's radius and is radiating 967 times the Sun's luminosity from its photosphere at an effective temperature of 4,134 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.[11]
In Chinese astronomy, it belongs to the 天廚 (Tiān Chú) (Celestial Kitchen) asterism.[12]