Theta2 Crucis

Theta2 Crucis, Latinized from θ2 Crucis, is a spectroscopic binary star in the constellation Crux. This pair of stars complete an orbit every 3.4280 days and they have a low orbital eccentricity that is close to 0.0.[11] Theta2 Crucis is located at about 750 light-years from the Sun.[2]

For other stars with the name θ Crucis, see Theta Crucis.
θ2 Crucis
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 04m 19.21504s[1]
Declination −63° 09′ 56.5537″[2]
Apparent magnitude (V) 4.718[3]
Characteristics
Spectral type B3 V[4]
U−B color index −0.61[5]
B−V color index −0.08[5]
Variable type β Cep
Astrometry
Radial velocity (Rv)+16.3[6] km/s
Proper motion (μ) RA: −17.63[2] mas/yr
Dec.: −0.01[2] mas/yr
Parallax (π)3.82 ± 0.32 mas[2]
Distance850 ± 70 ly
(260 ± 20 pc)
Absolute magnitude (MV)−2.35[7]
Orbit[8]
Period (P)3.428 d
Eccentricity (e)0.00
Periastron epoch (T)2419604.367 JD
Semi-amplitude (K1)
(primary)		51.3 km/s
Details
Luminosity809[9] L☉
Temperature9,598[9] K
Rotational velocity (v sin i)23[10] km/s
Other designations
θ2 Cru, CD−62° 610, HD 104841, HIP 58867, HR 4603, SAO 251717.[3]
Database references
SIMBADdata

The system has a combined mean apparent magnitude of +4.72m. Since a member of the system is a β Cephei-type variable star, the magnitude is not fixed but varies slightly between +4.70m and +4.74m. The period of this variability is 0.0889 days.[12] The system is categorized as is a blue-white B-type main sequence star with a stellar classification of B3 V.[4]

References
  1. van Leeuwen, F. (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, S2CID 18759600.
  2. Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
  3. "V* tet02 Cru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-05-19.
  4. Houk, N.; Cowley, A. P. (1975), University of Michigan Catalogue of two-dimensional spectral types for the HD stars, vol. 1, Bibcode:1975mcts.book.....H.
  5. Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  6. Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  7. 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, S2CID 119257644.
  8. Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
  9. 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, S2CID 118665352.
  10. Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
  11. Batten, A. H. (1967). "Sixth catalogue of the orbital elements of spectroscopic binary systems". Publications of the Dominion Astrophysical Observatory, Victoria. 13: 154–155. Bibcode:1967PDAO...13..119B.
  12. Samus, N. N.; Durlevich, O. V.; et al. (January 2009). "General Catalogue of Variable Stars". VizieR. Retrieved 2010-05-19. Note: query for GCVS "tet 2 Cru".
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