64 Draconis

"e Draconis" redirects here. Not to be confused with ε Draconis.
64 Draconis
Location of 64 Draconis (circled)
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]
Distance452 ± 8 ly
(139 ± 2 pc)
Absolute magnitude (MV)−1.05[4]
Details
Radius65[1] R☉
Luminosity926[1] L☉
Temperature3,952[1] K
Other designations
e Draconis, 64 Dra, BD+64°1405, FK5 3604, HD 190544, HIP 98583, HR 7676, SAO 18658[5]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference ubv was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference eggen1992 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).