Beta Circini
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Circinus |
| Right ascension | 15h 17m 30.84945s |
| Declination | −58° 48′ 04.3453″ |
| Apparent magnitude (V) | 4.069 |
| Characteristics | |
| Spectral type | A3 Va |
| U−B color index | +0.09 |
| B−V color index | +0.09 |
| Astrometry | |
| Radial velocity (Rv) | 9.6±2 km/s |
| Proper motion (μ) | RA: −97.182 mas/yr Dec.: −136.055 mas/yr |
| Parallax (π) | 35.8205±0.2515 mas |
| Distance | 91.1 ± 0.6 ly (27.9 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.64 |
| Details | |
| Mass | 1.96+0.03 −0.01 M☉ |
| Radius | 1.92 R☉ |
| Luminosity | 19 L☉ |
| Surface gravity (log g) | 4.281 cgs |
| Temperature | 8676±33 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotational velocity (v sin i) | 59 km/s |
| Age | 370–500 Myr |
| Other designations | |
| β Cir, Beta Circini, Beta Cir, CPD−58 5875, FK5 561, GC 20526, GJ 580.1, GJ 9516, HD 135379, HIP 74824, HR 5670, PPM 343590, SAO 242384. | |
| 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. It has an apparent visual magnitude of approximately 4.069, which is bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 35.8 mas as seen from the Earth, it is located 91 light years from the Sun.
With a stellar classification of A3 Va, this is an main-sequence star fusing atoms of hydrogen into helium at its core. It is between 370 and 500 million years old with around 1.9 times the Sun's radius. The star is radiating 19 times the Sun's luminosity from its photosphere at an effective temperature of 8,676 K. It has one known sub-stellar companion.