Theta2 Crucis information

θ² Crucis
	; A light curve for Theta2 Crucis, plotted from TESS data
Observation data; Epoch J2000 Equinox J2000
Constellation	Crux
Right ascension	12h 04m 19.22008s
Declination	−63° 09′ 56.5167″
Apparent magnitude (V)	4.70 - 4.74
Characteristics
Spectral type	B3 V
U−B color index	−0.61
B−V color index	−0.08
Variable type	β Cep
Astrometry
Radial velocity (Rv)	+16.3 km/s
Proper motion (μ)	RA: −18.467 mas/yr ; Dec.: +0.467 mas/yr
Parallax (π)	4.7314 ± 0.1276 mas
Distance	690 ± 20 ly ; (211 ± 6 pc)
Absolute magnitude (MV)	−2.35
Orbit
Period (P)	3.428 d
Eccentricity (e)	0.00
Periastron epoch (T)	2419604.367 JD
Semi-amplitude (K1); (primary)	51.3 km/s
Details
Mass	5.9 M☉
Radius	6.9 R☉
Luminosity	1,935 L☉
Surface gravity (log g)	3.55 cgs
Temperature	15,361 K
Metallicity [Fe/H]	+0.20 dex
Rotational velocity (v sin i)	23 km/s
Age	18.5 Myr
Other designations
	θ2 Cru, CD−62°610, HD 104841, HIP 58867, HR 4603, SAO 251717
Database references
SIMBAD	data

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.^[12] Theta² Crucis is located at about 690 light-years from the Sun.

Since a member of the system is a β Cephei-type variable star, the magnitude is not fixed but varies slightly between +4.70 and +4.74. The period of this variability is 0.0889 days.^[3] The system is categorized as is a blue-white B-type main sequence star with a stellar classification of B3 V,^[4] although it has also been classified as a subgiant.^[13] Evolutionary models show it at a late stage of its main sequence life.^[2]

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[skiff2014-13] Cite error: The named reference skiff2014 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
A light curve for Theta² Crucis, plotted from TESS data^[1]
Constellation	Crux
Right ascension	12^h 04^m 19.22008^s^[2]
Declination	−63° 09′ 56.5167″^[2]
Apparent magnitude (V)	4.70 - 4.74^[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^[3]
Astrometry

Radial velocity (R_v)	+16.3^[6] km/s
Proper motion (μ)	RA: −18.467^[2] mas/yr Dec.: +0.467^[2] mas/yr
Parallax (π)	4.7314 ± 0.1276 mas^[2]
Distance	690 ± 20 ly (211 ± 6 pc)
Absolute magnitude (M_V)	−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

Mass	5.9^[2] `M`_☉
Radius	6.9^[2] `R`_☉
Luminosity	1,935^[2] `L`_☉
Surface gravity (log g)	3.55^[2] cgs
Temperature	15,361^[2] K
Metallicity [Fe/H]	+0.20^[2] dex
Rotational velocity (v sin i)	23^[9] km/s
Age	18.5^[10] Myr

Other designations
θ² Cru, CD−62°610, HD 104841, HIP 58867, HR 4603, SAO 251717^[11]
Database references
SIMBAD	data

Theta2 Crucis information

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Theta2 Crucis

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List of brightest natural objects in the sky