Sigma Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 32m 05.22884s |
| Declination | −15° 14′ 40.8278″ |
| Apparent magnitude (V) | 4.78 |
| Characteristics | |
| Spectral type | F5 V or F4 IV |
| U−B color index | −0.03 |
| B−V color index | +0.45 |
| Astrometry | |
| Radial velocity (Rv) | −27.5±0.9 km/s |
| Proper motion (μ) |
RA: −80.21 mas/yr Dec.: −146.29 mas/yr |
| Parallax (π) | 37.46 ± 0.25mas |
| Distance | 87.1 ± 0.6 ly (26.7 ± 0.2 pc) |
| Absolute magnitude (MV) | +2.68 |
| Details | |
| σ Cet A | |
| Mass | 1.21 M☉ |
| Radius | 1.5 R☉ |
| Luminosity | 7.6 L☉ |
| Surface gravity (log g) | 4.07±0.07 cgs |
| Temperature | 6,527±59 K |
| Metallicity [Fe/H] | −0.12±0.04 dex |
| Rotational velocity (v sin i) | 20 km/s |
| Age | 2.135 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma Ceti (σ Ceti) is the Bayer designation for a star in the equatorial constellation of Cetus. With an apparent visual magnitude of 4.78, it can be seen with the naked eye on a dark night. Based upon an annual parallax shift of 37.46 mas, it lies at an estimated distance of 87.1 light years from the Sun. It is a probable astrometric binary star system.
The primary, component A, appears to be a normal F-type main sequence star with a stellar classification of F5 V. However, Malaroda (1975) assigned it a classification of F4 IV, which would suggest it is a more evolved subgiant star. It is estimated to have 121% of the Sun's mass and around 150% of the radius of the Sun. With an age of about 2.1 billion years, it is radiating 7.6 times the solar luminosity from its outer atmosphere at an effective temperature of 6,527 K.
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