Astronomy:64 Draconis

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Short description: Star in the constellation Draco
"e Draconis" redirects here. It is not to be confused with ε Draconis.
64 Draconis
Location of 64 Draconis (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distance452 ± 8 ly
(139 ± 2 pc)
Absolute magnitude (MV)−1.05[5]
Details
Mass1.36[6] M☉
Radius68[7] R☉
Luminosity967[7] L☉
Surface gravity (log g)1.16[8] cgs
Temperature4,134[8] K
Metallicity [Fe/H]−0.89[8] dex
Age5.4[8] Gyr
Other designations
e Draconis, 64 Dra, BD+64°1405, FK5 3604, HD 190544, HIP 98583, HR 7676, SAO 18658[9]
Database references
SIMBADdata

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]

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]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 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. ↑ 3.0 3.1 Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  4. ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  5. ↑ 5.0 5.1 5.2 5.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  6. ↑ Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. Bibcode: 2020A&A...633A..34C. 
  7. ↑ 7.0 7.1 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F. 
  8. ↑ 8.0 8.1 8.2 8.3 Tautvaišienė, G.; Mikolaitis, Š.; Drazdauskas, A.; Stonkutė, E.; Minkevičiūtė, R.; Pakštienė, E.; Kjeldsen, H.; Brogaard, K. et al. (2022). "Chemical Composition of Bright Stars in the Northern Hemisphere: Star-Planet Connection". The Astrophysical Journal Supplement Series 259 (2): 45. doi:10.3847/1538-4365/ac50b5. Bibcode: 2022ApJS..259...45T. 
  9. ↑ "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+40409. 
  10. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog 1. Bibcode: 2009yCat....102025S. 
  12. ↑ Ridpath, Ian. "Star Tales - Draco". http://ianridpath.com/startales/draco.html. 




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