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64 Draconis

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(Redirected from 64 Dra) Star in the constellation Draco "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 20 01 28.65587
Declination +64° 49′ 15.5038″
Apparent magnitude (V) 5.27
Characteristics
Evolutionary stage red giant
Spectral type M1 III
B−V color index 1.598±0.006
Astrometry
Radial velocity (Rv)−36.12±0.13 km/s
Proper motion (μ) RA: −24.818 mas/yr
Dec.: +33.623 mas/yr
Parallax (π)7.2102 ± 0.1296 mas
Distance452 ± 8 ly
(139 ± 2 pc)
Absolute magnitude (MV)−1.05
Details
Radius65 R☉
Luminosity926 L☉
Temperature3,952 K
Other designations
e Draconis, 64 Dra, BD+64°1405, FK5 3604, HD 190544, HIP 98583, HR 7676, SAO 18658
Database references
SIMBADdata

64 Draconis is a single star in the northern circumpolar constellation of Draco, located 452 light years away. 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. 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.

This is an evolved red giant star with a stellar classification of M1 III, currently on the asymptotic giant branch. 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.

In Chinese astronomy, it belongs to the 天廚 (Tiān Chú) (Celestial Kitchen) asterism.

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Ducati, J. R. (2002). "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  5. "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-16.
  6. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  7. Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  8. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog. 1. Bibcode:2009yCat....102025S.


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