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64 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]

References

  1. ^ a b c d e f g h i 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. ^ a b 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. ^ a b 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. ^ a b c d 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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