Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Circinus |
Right ascension | 14h 46m 41.98011s [2] |
Declination | −61° 27′ 42.9903″ [2] |
Apparent magnitude (V) | 7.37 - 7.71 [3] |
Characteristics | |
Spectral type | F2/3II + B6V [4] |
B−V color index | 0.649±0.020 [5] |
Astrometry | |
Proper motion (μ) |
RA: −5.355
[2]
mas/
yr Dec.: −3.920 [2] mas/ yr |
Parallax (π) | 0.9952 ± 0.0402 mas [2] |
Distance | 3,300 ± 100
ly (1,000 ± 40 pc) |
Absolute magnitude (MV) | −2.91 [6] |
Orbit [6] | |
Period (P) | 20 yr |
Semi-major axis (a) | 15.8 AU |
Details | |
A | |
Mass | 5 [7] M☉ |
Radius | 30.38+6.93 −6.50 [2] R☉ |
Luminosity | 917±54 [2] L☉ |
Surface gravity (log g) | 2.75 [8] cgs |
Temperature | 6356±23 [8] K |
B | |
Mass | 4.7 [6] M☉ |
Surface gravity (log g) | 4.0±0.5 [7] cgs |
Temperature | 16,000±1,000 [7] K |
Other designations | |
Database references | |
SIMBAD | data |
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. [2]
The variability of this star was discovered by D. W. Kurtz in 1979. [7] A small-amplitude Cepheid variable, [8] its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days. [3] A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II. [4] The spectrum shows peculiarities in the metallic lines. [10] The secondary is a 4.7 solar mass ( M☉) blue-white main sequence star of spectral type B6. [6]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Circinus |
Right ascension | 14h 46m 41.98011s [2] |
Declination | −61° 27′ 42.9903″ [2] |
Apparent magnitude (V) | 7.37 - 7.71 [3] |
Characteristics | |
Spectral type | F2/3II + B6V [4] |
B−V color index | 0.649±0.020 [5] |
Astrometry | |
Proper motion (μ) |
RA: −5.355
[2]
mas/
yr Dec.: −3.920 [2] mas/ yr |
Parallax (π) | 0.9952 ± 0.0402 mas [2] |
Distance | 3,300 ± 100
ly (1,000 ± 40 pc) |
Absolute magnitude (MV) | −2.91 [6] |
Orbit [6] | |
Period (P) | 20 yr |
Semi-major axis (a) | 15.8 AU |
Details | |
A | |
Mass | 5 [7] M☉ |
Radius | 30.38+6.93 −6.50 [2] R☉ |
Luminosity | 917±54 [2] L☉ |
Surface gravity (log g) | 2.75 [8] cgs |
Temperature | 6356±23 [8] K |
B | |
Mass | 4.7 [6] M☉ |
Surface gravity (log g) | 4.0±0.5 [7] cgs |
Temperature | 16,000±1,000 [7] K |
Other designations | |
Database references | |
SIMBAD | data |
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. [2]
The variability of this star was discovered by D. W. Kurtz in 1979. [7] A small-amplitude Cepheid variable, [8] its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days. [3] A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II. [4] The spectrum shows peculiarities in the metallic lines. [10] The secondary is a 4.7 solar mass ( M☉) blue-white main sequence star of spectral type B6. [6]