1 Ceti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 23h 58m 21.22498s |
| Declination | −15° 50′ 50.9410″ |
| Apparent magnitude (V) | +6.276 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K1III CNII |
| U−B color index | +1.03 |
| B−V color index | +1.08 |
| Astrometry | |
| Radial velocity (Rv) | 4.3±2 km/s |
| Proper motion (μ) | RA: +82.986 mas/yr Dec.: −7.951 mas/yr |
| Parallax (π) | 6.1526±0.0329 mas |
| Distance | 530 ± 3 ly (162.5 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.10 |
| Details | |
| Mass | 2.4 M☉ |
| Radius | 13.9 R☉ |
| Luminosity | 83 L☉ |
| Surface gravity (log g) | 2.60 cgs |
| Temperature | 4,906 K |
| Metallicity [Fe/H] | 0.05 dex |
| Rotational velocity (v sin i) | 3.1 km/s |
| Age | 2.0 Gyr |
| Other designations | |
| 1 Cet, BD−16°6394, FK5 3925, GC 33242, HD 224481, HIP 118178, HR 9065, SAO 165972 | |
| Database references | |
| SIMBAD | data |
1 Ceti is a star in the constellation of Cetus. With an apparent magnitude of about 6.2, the star is barely visible to the naked eye (see Bortle scale). Parallax estimates put it at a distance of about 530 light-years (162.5 parsecs) away from the Earth. It is moving further from the Sun with a heliocentric radial velocity of 4 km/s.
This star has a spectral type of K1III, implying a K-type giant. These types of stars are generally reddish-colored stars with spectral types from K to M, with radii that are 10 to 100 times larger than the Sun. The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere. The star is radiating 83 times the Sun's luminosity from its enlarged photosphere.