Epsilon Circini
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Circinus |
| Right ascension | 15h 17m 38.89307s |
| Declination | −63° 36′ 37.6831″ |
| Apparent magnitude (V) | 4.86 |
| Characteristics | |
| Spectral type | K2.5 III |
| U−B color index | +1.32 |
| B−V color index | +1.260±0.004 |
| Astrometry | |
| Radial velocity (Rv) | −3.72±0.42 km/s |
| Proper motion (μ) | RA: +3.209 mas/yr Dec.: +9.344 mas/yr |
| Parallax (π) | 7.5809±0.1085 mas |
| Distance | 430 ± 6 ly (132 ± 2 pc) |
| Absolute magnitude (MV) | −0.63 |
| Details | |
| Mass | 4.3 M☉ |
| Radius | 24 R☉ |
| Luminosity | 338 L☉ |
| Surface gravity (log g) | 2.22 cgs |
| Temperature | 4,767 K |
| Other designations | |
| ε Cir, CPD−63°3544, FK5 3205, HD 135291, HIP 74837, HR 5666, SAO 253088 | |
| Database references | |
| SIMBAD | data |
Epsilon Circini, Latinized from ε Circini, is a solitary star located in the southern constellation of Circinus. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.86. The distance to this star, as determined by a measured annual parallax shift of 7.63 mas, is around 430 light years. It is drifting closer to the Sun with a radial velocity of −4 km/s.
This is an evolved K-type giant star with a stellar classification of K2.5 III. With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24 times the girth of the Sun. It radiates about 338 times the solar luminosity from its photosphere at an effective temperature of 4,767 K.