21 Camelopardalis

21 Camelopardalis is a star in the northern circumpolar constellation of Camelopardalis, located around 650 light years away from the Sun.[1] It is a challenge to view with the naked eye even under excellent viewing conditions, having an apparent visual magnitude of 6.9.[2] This is one of the fainter stars with a Flamsteed designation, one of only 220 below the magnitude cutoff for the Bright Star Catalogue.[9] It is moving closer to the Earth with a heliocentric radial velocity of −15.5 km/s.[5]

21 Camelopardalis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension  05h 40m 28.99683s[1]
Declination +61° 56′ 56.0999″[1]
Apparent magnitude (V) 6.867[2]
Characteristics
Spectral type A5[3]
B−V color index +0.22[4]
Astrometry
Radial velocity (Rv)−15.5[5] km/s
Proper motion (μ) RA: −6.911[1] mas/yr
Dec.: +1.818[1] mas/yr
Parallax (π)5.0131 ± 0.0864[1] mas
Distance650 ± 10 ly
(199 ± 3 pc)
Absolute magnitude (MV)0.90[6]
Details
Radius3.121[7] R☉
Luminosity35.66[6] L☉
Temperature7,619[7] K
Other designations
21 Cam, BD+61°806, FK5 1150, HD 37136, HIP 26700, SAO 13564[8]
Database references
SIMBADdata

The spectral type for 21 Camelopardalis is given only as A5 with no published luminosity class. It is treated as a normal main sequence star,[10] although it is calculated to be larger and more luminous than a typical A5 main sequence star.[7][11] Based upon changes to its proper motion over time, this is a probable astrometric binary.[12]

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. Paunzen, E. (2015). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy & Astrophysics. 580: A23. arXiv:1506.04568. Bibcode:2015A&A...580A..23P. doi:10.1051/0004-6361/201526413.
  3. Eggen, O. J. (1985). "Hyades and Sirius supercluster members brighter than magnitude(V) 7.1. I - the first six hours of right ascension". Astronomical Society of the Pacific. 97: 807. Bibcode:1985PASP...97..807E. doi:10.1086/131607.
  4. Soubiran, C.; Le Campion, J.-F.; Cayrel De Strobel, G.; Caillo, A. (2010). "The PASTEL catalogue of stellar parameters". Astronomy and Astrophysics. 515: A111. arXiv:1004.1069. Bibcode:2010A&A...515A.111S. doi:10.1051/0004-6361/201014247.
  5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. 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.
  7. Masana, E.; Jordi, C.; Ribas, I. (2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy and Astrophysics. 450 (2): 735. arXiv:astro-ph/0601049. Bibcode:2006A&A...450..735M. doi:10.1051/0004-6361:20054021.
  8. "21 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-17.
  9. Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Données Stellaires. 38: 13. Bibcode:1990BICDS..38...13B.
  10. Jordi, C.; Figueras, F.; Torra, J.; Asiain, R. (1996). "UvbyHbeta_ photometry of main sequence A type stars". Astronomy and Astrophysics Supplement. 115: 401. Bibcode:1996A&AS..115..401J.
  11. Habets, G. M. H. J.; Heintze, J. R. W. (1981). "Empirical bolometric corrections for the main-sequence". Astronomy and Astrophysics Supplement Series. 46: 193. Bibcode:1981A&AS...46..193H.
  12. Frankowski, A.; Jancart, S.; Jorissen, A. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics, 464 (1): 377–392, arXiv:astro-ph/0612449, Bibcode:2007A&A...464..377F, doi:10.1051/0004-6361:20065526
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