5 Camelopardalis

5 Camelopardalis is a binary star[9] system in the northern circumpolar constellation of Camelopardalis, located about 770 light years away from the Sun as determined using parallax.[1] With an apparent magnitude of 5.5,[2] it can be seen with the naked eye as a faint, blue-white hued star. The system is moving further from the Earth with a heliocentric radial velocity of +2.4 km/s.[5]

5 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 04h 55m 03.13350s[1]
Declination +55° 15′ 32.8530″[1]
Apparent magnitude (V) 5.522[2]
Characteristics
Spectral type B9.5 V[3] or B9.5 IV[4]
U−B color index +0.001[2]
B−V color index +0.038[2]
Astrometry
Radial velocity (Rv)+2.4[5] km/s
Proper motion (μ) RA: −15.304[1] mas/yr
Dec.: −11.501[1] mas/yr
Parallax (π)4.2348 ± 0.0951[1] mas
Distance770 ± 20 ly
(236 ± 5 pc)
Absolute magnitude (MV)−0.84[6]
Details
Mass3.36±0.13[7] M☉
Luminosity289.5+82.5
−64.5[7] L☉
Temperature9,931+69
−68[7] K
Rotational velocity (v sin i)102[7] km/s
Other designations
5 Cam, BD+55°941, FK5 2367, HD 30958, HIP 22854, HR 1555, SAO 24904, WDS J04551+5516A[8]
Database references
SIMBADdata

The primary component is a B-type main sequence star with a stellar classification of B9.5 V.[3] However, Abt and Morrell (1995) found a luminosity class of IV,[4] suggesting it is instead a subgiant star that is evolving off the main sequence. It has a high rate of spin with a projected rotational velocity of 102 km/s and has 3.36[7] times the mass of the Sun. The star is radiating 289.5 times the luminosity of the Sun from its photosphere at an effective temperature of 9,931 K.[7] The magnitude 12.9 astrometric companion lies at an angular separation of 12.9″.[9]

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. Markkanen, T. (1977), "The magnetic pocket. An observational study of structure of the galactic magnetic field and of interstellar dust in the direction of the alpha Per cluster.", Observatory and Astrophysics Laboratory, University of Helsinki, Report, 1, Bibcode:1977HelR....1....0M.
  3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
  5. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., 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. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  8. "5 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-14.
  9. Eggleton, P. P.; et al. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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