W Crucis

W Crucis is a star system in the constellation Crux. A Beta Lyrae variable, its apparent magnitude ranges from 9.04 to 10.38 over 198 days.[3] Its light curve has been observed to be asymmetric with subsequent maxima differing in height,[5] which is described as the so-called O'Connell effect.

W Crucis

Observation data Epoch J2000      Equinox J2000
Constellation	Crux
Right ascension	12^h 11^m 59.16182^s[1]
Declination	−58° 47′ 00.7374″[1]
Apparent magnitude (V)	8.44[2] (9.04–10.38)[3]
Characteristics
Evolutionary stage	F2/F3II+B6.0[4]
Astrometry
Radial velocity (Rv)	−22.6 ± 2[4] km/s
Proper motion (μ)	RA: −6.142[4] mas/yr Dec.: 0.198[4] mas/yr
Parallax (π)	0.5363 ± 0.0421[1] mas
Distance	6,100 ± 500 ly (1,900 ± 100 pc)
Other designations
CD−58 4431, CPD−58 4151, HD 105998, HIP 59483[4]
Database references
SIMBAD	data

References

1. 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:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
3. Watson, Christopher (4 January 2010). "W Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 23 June 2014.
4. "W Crucis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 June 2014.
5. D. J. K. O'Connell (1951). "The so-called periastron effect in close eclipsing binaries". Riverview College Observatory Publications. 2 (6): 85. Bibcode:1951PRCO....2...85O.