BG Crucis

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BG Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 31m 40.33011s[1]
Declination −59° 25′ 26.1224″[1]
Apparent magnitude (V) 5.49[2] (5.34 - 5.58)[3]
Spectral type F7Ib/II[4] (F5Ib - G0p)[3]
B−V color index 0.622±0.012[2]
Radial velocity (Rv)−19.3±2.2[5] km/s
Proper motion (μ) RA: −12.689[1] mas/yr
Dec.: −4.110[1] mas/yr
Parallax (π)1.7777 ± 0.0873[1] mas
Distance1,830 ± 90 ly
(560 ± 30 pc)
Absolute magnitude (MV)−2.63[2]
Mass4.3[6] M
Luminosity1,033.93[2] L
Surface gravity (log g)2.15[6] cgs
Temperature6,253±30[6] K
Rotational velocity (v sin i)22.0±1.8[7] km/s
Other designations
BG Cru, CD−58° 4603, HD 108968, HIP 61136, HR 4768, SAO 180937, G 35 Cru[8]
Database references

BG Crucis is a star in the southern constellation of Crux. A classical Cepheid variable, its apparent magnitude ranges from 5.34 to 5.58 over 3.3428 days.[3] A yellow-white supergiant that pulsates between spectral types F5Ib and G0p, it is around 4.3 times as massive and 2,000 times as luminous as the Sun.[6]


  1. ^ a b c d e 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:1804.09365Freely accessible. Bibcode:2018A&A...616A...1GFreely accessible. doi:10.1051/0004-6361/201833051Freely accessible. 
  2. ^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. 
  3. ^ a b c Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. 
  4. ^ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ a b c d Usenko, I. A.; et al. (2014). "Spectroscopic studies of southern-hemisphere Cepheids: Three Cepheids in Crux (BG Cru, R Cru, and T Cru)". Astronomy Letters. 40 (7): 435. Bibcode:2014AstL...40..435U. doi:10.1134/S106377371407007X. 
  7. ^ Ammler-von Eiff, M.; Reiners, A. (June 2012). "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?". Astronomy & Astrophysics. 542: A116. arXiv:1204.2459Freely accessible. Bibcode:2012A&A...542A.116A. doi:10.1051/0004-6361/201118724. 
  8. ^ "TU Crv". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2018.