BL Crucis
BL Crucis is a red giant and a semiregular variable in the constellation of Crux.[2] It has periods with three frequencies of 30.7, 42.3 and 43.6 days.[3] It is 480 ± 10 light-years distant from Earth.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 27m 28.88s |
| Declination | −58° 59′ 30.4″ |
| Apparent magnitude (V) | 5.38 |
| Characteristics | |
| Spectral type | M4-5III |
| Variable type | semiregular variable |
| Astrometry | |
| Radial velocity (Rv) | 71.7 ± 0.9 km/s |
| Proper motion (μ) | RA: -20.027 ± 0.301[1] mas/yr Dec.: 3.586 ± 0.268 [1] mas/yr |
| Parallax (π) | 6.8429 ± 0.1942[1] mas |
| Distance | 480 ± 10 ly (146 ± 4 pc) |
| Other designations | |
HD 108396, HIP 60781, HR 4739, SAO 239960, CD−58° 4560 | |
| Database references | |
| SIMBAD | data |
References
- 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. Gaia DR2 record for this source at VizieR.
- Watson, Christopher (25 August 2009). "BL Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 July 2014.
- Tabur, V.; Bedding, T. R. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.
External links
- David H. Levy, Observing variable stars : a guide for the beginner ISBN 0521627559
- General Catalogue of Variable Stars
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