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]
| 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 mas[1] |
| Distance | 650 ± 10 ly (199 ± 3 pc) |
| Absolute magnitude (MV) | 0.90[6] |
| Details | |
| Radius | 3.121[7] R☉ |
| Luminosity | 35.66[6] L☉ |
| Temperature | 7,619[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ a b c d e f 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.
- ^ a b 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. S2CID 73623700.
- ^ 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.
- ^ 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. S2CID 118362423.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- ^ a b 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.
- ^ a b c 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. S2CID 15278668.
- ^ "21 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-17.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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, S2CID 14010423