20 Ceti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 53m 00.49452s |
| Declination | −01° 08′ 39.3317″ |
| Apparent magnitude (V) | 4.76 |
| Characteristics | |
| Spectral type | K5 III |
| U−B color index | +1.91 |
| B−V color index | +1.56 |
| Astrometry | |
| Radial velocity (Rv) | +16.22±0.28 km/s |
| Proper motion (μ) | RA: +6.99 mas/yr Dec.: −15.66 mas/yr |
| Parallax (π) | 5.56±0.22 mas |
| Distance | 590 ± 20 ly (180 ± 7 pc) |
| Absolute magnitude (MV) | −1.58 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 65.93+2.13 −2.25 R☉ |
| Luminosity | 754.8±52.6 L☉ |
| Surface gravity (log g) | 1.61 cgs |
| Temperature | 4,065 K |
| Metallicity [Fe/H] | −0.19 dex |
| Other designations | |
| BD−01°114, FK5 1022, HD 5112, HIP 4147, HR 248, SAO 129009 | |
| Database references | |
| SIMBAD | data |
20 Ceti is a single star located around 590 light years away in the equatorial constellation of Cetus. It is faintly visible to the naked eye with apparent magnitude is 4.76. The Bright Star Catalogue has this star classified as M0III, matching an aging red giant star that has consumed the hydrogen at its core and expanded. Houk and Swift (1999) listed an earlier class of K5 III. It has around 66 times the Sun's radius and is radiating about 750 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,065 K.