Theta2 Crucis
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 04m 19.2155s[1] |
| Declination | −63° 09′ 56.559″[1] |
| Apparent magnitude (V) | 4.718[2] |
| Characteristics | |
| Spectral type | B2 IV[2] |
| U−B color index | −0.61[3] |
| B−V color index | −0.08[3] |
| Variable type | Beta Cephei variable |
| Astrometry | |
| Radial velocity (Rv) | +16.3[4] km/s |
| Proper motion (μ) | RA: −17.19[1] mas/yr Dec.: −0.01[1] mas/yr |
| Parallax (π) | 4.33 ± 0.53[1] mas |
| Distance | approx. 750 ly (approx. 230 pc) |
| Details | |
| Rotational velocity (v sin i) | 23[5] km/s |
| Other designations | |
Theta2 Crucis (θ2 Cru / Theta2 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.[6] Theta2 Crucis is located at about 750 light-years from the Sun.[1]
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.[7] The system is categorized as is a blue-white subgiant with a stellar classification of B2 IV.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ↑ 2.0 2.1 2.2 "V* tet02 Cru -- Spectroscopic binary". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-05-19.
- ↑ 3.0 3.1 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). Bibcode:1966CoLPL...4...99J.
- ↑ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:[http://adsabs.harvard.edu/abs/1953QB901.W495..... 1953QB901.W495.....]
- ↑ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode:1970CoAsi.239....1B.
- ↑ 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.
- ↑ 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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