Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Circinus |
Right ascension | 15h 17m 30.8488s[1] |
Declination | −58° 48′ 04.3384″[1] |
Apparent magnitude (V) | 4.069[2] |
Characteristics | |
Spectral type | A3 Va[2] |
U−B color index | +0.09[3] |
B−V color index | +0.09[3] |
Astrometry | |
Radial velocity (Rv) | 9.6 ± 2[2] km/s |
Proper motion (μ) | RA: −96.742±0.491[1] mas/yr Dec.: −136.541±0.621[1] mas/yr |
Parallax (π) | 35.1736 ± 0.4253 mas[1] |
Distance | 93 ± 1 ly (28.4 ± 0.3 pc) |
Absolute magnitude (MV) | +1.64[4] |
Details | |
Radius | 1.3[5] R☉ |
Luminosity | 19[4] L☉ |
Surface gravity (log g) | 4.281[6] cgs |
Temperature | 8676±33[7] K |
Metallicity [Fe/H] | 0.16[4] dex |
Rotational velocity (v sin i) | 59[3] km/s |
Age | 370–500[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Beta Circini, Latinized from β Circini, is an A-type main sequence star and is the second-brightest star in the constellation of Circinus.[2] It has an apparent visual magnitude of approximately 4.069,[2] which is bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 35.17 mas as seen from the Earth,[2] it is located about 93 light years from the Sun.
With a stellar classification of A3 Va,[2] this is an A-type main-sequence star. It is between 370 and 500 million years old[7] with around 1.3[5] times the Sun's radius. The star is radiating 19[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,676 K.[7] It has one known sub-stellar companion.
Beta Circini b is a distant brown dwarf companion orbiting the host star at a distance of 6,656 AU.[8][7] It has a surface temperature of 2,084.0 K. Its mass was estimated using the Spectrum method which concluded that the object has a mass of 56.0±7.0 MJ.[8]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 56.0 (± 7.0) MJ | 6656.0 | — | — | — | — |