BL Crucis
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| 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 |
| B−V color index | 1.54[1] |
| Variable type | semiregular variable |
| Astrometry | |
| Radial velocity (Rv) | 76.20 ± 1.30[1] km/s |
| Proper motion (μ) | RA: -13.90 ± 0.24[1] mas/yr Dec.: 5.93 ± 0.23[1] mas/yr |
| Parallax (π) | 7.36 ± 0.32[1] mas |
| Distance | 565.6[2] ly (173.4[2] pc) |
| Absolute magnitude (MV) | -0.818[2] |
| Details | |
| Temperature | <3500[3] K |
| Other designations | |
HD108396, HIP60781, HR4739 | |
BL Crucis is a red giant and a semiregular variable in the constellation of Crux.
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "HR 4739, a red giant star in Crux", Ashland Astronomy Studio, retrieved 2012-09-03
- ↑ 2.0 2.1 2.2 "HIP60781", Wolfram Alpha, retrieved 2012-09-03
- ↑ "HIP:60781", Astronomy Launchpad, retrieved 2012-09-18
External links
- David H. Levy, Observing variable stars : a guide for the beginner ISBN 0521627559
- General Catalogue of Variable Stars
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