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]

BL Crucis
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
Distance480 ± 10 ly
(146 ± 4 pc)
Other designations
HD 108396, HIP 60781, HR 4739, SAO 239960, CD58° 4560
Database references
SIMBADdata

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. Gaia DR2 record for this source at VizieR.
  2. Watson, Christopher (25 August 2009). "BL Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 July 2014.
  3. 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. S2CID 15358380.


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