4 Camelopardalis

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4 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 04h 48m 00.27274s[1]
Declination +56° 45′ 25.8645″[1]
Apparent magnitude (V) 5.26[2]
Spectral type A3m[3]
U−B color index 0.12[2]
B−V color index 0.25[2]
Radial velocity (Rv) 22.50±0.9[4] km/s
Proper motion (μ) RA: +52.74[1] mas/yr
Dec.: -145.87[1] mas/yr
Parallax (π) 18.95 ± 0.52[1] mas
Distance 172 ± 5 ly
(53 ± 1 pc)
Rotational velocity (v sin i) 75[5] km/s
Other designations
BD+56° 973, HD 30121, HIP 22287, FK5 175, HR 1511, SAO 24829.
Database references

4 Camelopardalis is a star in the northern constellation of Camelopardalis. With an apparent visual magnitude of 5.26, it is faintly visible to the naked eye. This is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements.[6] There is a faint, magnitude 9.49 companion at an angular separation of 0.610″; most likely the pair form a binary star system.[7]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 Vizier catalog entry
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........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. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ Royer, F.; et al. (2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics, 393 (3): 897–911, Bibcode:2002A&A...393..897R, arXiv:astro-ph/0205255Freely accessible, doi:10.1051/0004-6361:20020943 
  6. ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788 
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x 

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