Astronomy:BL Crucis
From HandWiki
Short description: Star in the constellation Crux
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas/yr Dec.: 3.586 ± 0.268 [2] mas/yr |
| Parallax (π) | 6.8429 ± 0.1942[2] 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 |
BL Crucis is a red giant and a semiregular variable in the constellation of Crux.[3] It has periods with three frequencies of 30.7, 42.3 and 43.6 days.[1] It is 480 ± 10 light-years distant from Earth.[2]
References
- ↑ 1.0 1.1 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. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T.
- ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Watson, Christopher (25 August 2009). "BL Crucis". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=10857. Retrieved 20 July 2014.
External links
- David H. Levy, Observing variable stars : a guide for the beginner ISBN:0521627559
- General Catalogue of Variable Stars
 |  |
