BP Circini
BP Circini is a binary star system in the southern constellation of Circinus. It is located at a distance of approximately 3,300 light years from the Sun based on parallax.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Circinus |
| Right ascension | 14h 46m 41.98011s |
| Declination | −61° 27′ 42.9903″ |
| Apparent magnitude (V) | 7.37 - 7.71 |
| Characteristics | |
| Spectral type | F2/3II + B6V |
| B−V color index | 0.649±0.020 |
| Astrometry | |
| Proper motion (μ) | RA: −5.355 mas/yr Dec.: −3.920 mas/yr |
| Parallax (π) | 0.9952 ± 0.0402 mas |
| Distance | 3,300 ± 100 ly (1,000 ± 40 pc) |
| Absolute magnitude (MV) | −2.91 |
| Orbit | |
| Period (P) | 20 yr |
| Semi-major axis (a) | 15.8 AU |
| Details | |
| A | |
| Mass | 5 M☉ |
| Radius | 30.38+6.93 −6.50 R☉ |
| Luminosity | 917±54 L☉ |
| Surface gravity (log g) | 2.75 cgs |
| Temperature | 6356±23 K |
| B | |
| Mass | 4.7 M☉ |
| Surface gravity (log g) | 4.0±0.5 cgs |
| Temperature | 16,000±1,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The variability of this star was discovered by D. W. Kurtz in 1979. A small-amplitude Cepheid variable, its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days. A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II. The spectrum shows peculiarities in the metallic lines. The secondary is a 4.7 solar mass (M☉) blue-white main sequence star of spectral type B6.
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