1 Ceti
Star in the constellation Cetus
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1 Ceti is a star in the constellation of Cetus. With an apparent magnitude of about 6.2,[3] 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.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 23h 58m 21.22498s[2] |
| Declination | −15° 50′ 50.9410″[2] |
| Apparent magnitude (V) | +6.276[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K1III CNII[4] |
| U−B color index | +1.03[5] |
| B−V color index | +1.08[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.3±2[6] km/s |
| Proper motion (μ) | RA: +82.986[2] mas/yr Dec.: −7.951[2] mas/yr |
| Parallax (π) | 6.1526±0.0329 mas[2] |
| Distance | 530 ± 3 ly (162.5 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.10[1] |
| Details | |
| Mass | 2.4[7] M☉ |
| Radius | 13.9[8] R☉ |
| Luminosity | 83[8] L☉ |
| Surface gravity (log g) | 2.60[7] cgs |
| Temperature | 4,906[7] K |
| Metallicity [Fe/H] | 0.05[7] dex |
| Rotational velocity (v sin i) | 3.1[9] km/s |
| Age | 2.0[10] Gyr |
| Other designations | |
| 1 Cet, BD−16°6394, FK5 3925, GC 33242, HD 224481, HIP 118178, HR 9065, SAO 165972[11] | |
| Database references | |
| SIMBAD | data |
This star has a spectral type of K1III,[4] 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.[12] The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere.[13][14] The star is radiating 83 times the Sun's luminosity from its enlarged photosphere.[8]