BK Camelopardalis

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BK Camelopardalis
Camelopardalis constellation map.svg
Red circle.svg

Location of BK Camelopardalis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 19m 59.27267s[1]
Declination +65° 39′ 08.2502″[1]
Apparent magnitude (V) 4.78 - 4.89[2]
Spectral type B2.5 Vne[3]
U−B color index −0.77[4]
B−V color index −0.15[4]
R−I color index −0.13[4]
Variable type γ Cas[2]
Radial velocity (Rv) -3.40[5] km/s
Proper motion (μ) RA: 11.25[1] mas/yr
Dec.: −14.56[1] mas/yr
Parallax (π) 4.28 ± 0.48[1] mas
Distance approx. 760 ly
(approx. 230 pc)
Absolute magnitude (MV) −2.05[6]
Mass 7.5[3] M
Radius 4.0[7] R
Surface gravity (log g) 4.20[8] cgs
Temperature 20,893[9] K
Rotational velocity (v sin i) 328[8] km/s
Age 31.6[3] Myr
Other designations
BK Cam, BD+65°340, HD 20336, HIP 15520, HR 985, SAO 12704
Database references

BK Camelopardalis is a variable star in the constellation Camelopardalis.

Chinese name[edit]

In Chinese, 紫微右垣 (Zǐ Wēi Yòu Yuán), meaning Right Wall of Purple Forbidden Enclosure, refers to an asterism consisting of BK Camelopardalis, α Draconis, κ Draconis, λ Draconis, 24 Ursae Majoris, 43 Camelopardalis and α Camelopardalis.[10] Consequently, BK Camelopardalis itself is known as 紫微右垣七 (Zǐ Wēi Yòu Yuán qī, English: the Seventh Star of Right Wall of Purple Forbidden Enclosure.) representing 上丞 (Shǎngchéng), meaning First Prime Minister.[11] 上丞 (Shǎngchéng) is westernized in Shang Ching by R.H. Allen, the meaning is "Higher Minister", but it is not cleared designation.[12]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  3. ^ a b c Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. 
  4. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ Zorec, J.; Briot, D. (1991). "Absolute magnitudes of B emission line stars - Correlation between the luminosity excess and the effective temperature". Astronomy and Astrophysics (ISSN 0004-6361). 245: 150. Bibcode:1991A&A...245..150Z. 
  7. ^ Underhill, A. B.; Divan, L.; Prevot-Burnichon, M.-L.; Doazan, V. (1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the Royal Astronomical Society. 189 (3): 601. Bibcode:1979MNRAS.189..601U. doi:10.1093/mnras/189.3.601. 
  8. ^ a b Zorec, J.; Frémat, Y.; Cidale, L. (2005). "On the evolutionary status of Be stars. I. Field Be stars near the Sun". Astronomy and Astrophysics. 441: 235. arXiv:astro-ph/0509119Freely accessible. Bibcode:2005A&A...441..235Z. doi:10.1051/0004-6361:20053051. 
  9. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  10. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  11. ^ English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived August 10, 2010, at the Wayback Machine., Hong Kong Space Museum. Accessed on line November 23, 2010.
  12. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Camelopardalis

External links[edit]