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θ2 Crucis2 Cru / Theta2 Crucis) is a spectroscopic binary star in the constellation Crux. It has a mean apparent magnitude of +4.72m. Since the star is a β Cephei-type variable star, the value is not fixed but varies slightly between +4.70m and +4.74m. The period is 0.0889 days. The star is classified as a blue-white subgiant (spectral class B2 IV). θ2 Crucis is located at about 750 light-years from the Sun.

References


θ2 Crucis
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 typeB2IV[2]
U−B color index−0.61[3]
B−V color index−0.08[3]
Variable typeBeta 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
Distanceapprox. 750 ly
(approx. 230 pc)
Details
Rotational velocity (v sin i)23[5] km/s
Other designations
HR 4603, CD-62 610, HD 104841, SAO 251717, HIP 58867.[2]

θ2 Crucis2 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] θ2 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

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