HD 112028

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HD 112028
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 12h 49m 13.58934s[1]
Declination +83° 24′ 46.4198″[1]
Apparent magnitude (V) 5.28[2] (5.39 + 5.88)[3]
Spectral type A1IIIsh + (A0V + A2V)[3]
U−B color index −0.06[2]
B−V color index −0.03[2]
Radial velocity (Rv) +2.3[4] km/s
Proper motion (μ) RA: −41.33[1] mas/yr
Dec.: +14.63[1] mas/yr
Parallax (π) 5.59 ± 2.19[1] mas
Distance approx. 600 ly
(approx. 180 pc)
Luminosity 174[5] L
Surface gravity (log g) 2.88±0.13[6] cgs
Temperature 9,443±345[6] K
Metallicity [Fe/H] −0.39±0.22[6] dex
Rotational velocity (v sin i) 275[7] km/s
Other designations
BD+84° 290, HD 112028, HIP 62572, HR 4893, SAO 2102.
Database references

HD 112028 is a triple star system in the northern constellation of Camelopardalis. The primary is a shell star with a stellar classification of A1IIIsh. At an angular separation of 21.47 is a close binary star system consisting of a pair of A-type main sequence stars that orbit each other with a period of 3.287 days and an eccentricity of 0.04.[3]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  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 ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data.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. ^ a b c 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  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. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x 
  6. ^ a b c Prugniel, P.; Vauglin, I.; Koleva, M. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769. 
  7. ^ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode:1970crvs.book.....U. 

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