| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h53m 00.49452s[1] |
| Declination | −01° 08′ 39.3317″[1] |
| Apparent magnitude (V) | 4.76[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.91[4] |
| B−V color index | +1.56[4] |
| Astrometry | |
| Radial velocity (Rv) | +16.22±0.28[5] km/s |
| Proper motion (μ) | RA: +6.99[1] mas/yr Dec.: −15.66[1] mas/yr |
| Parallax (π) | 5.56 ± 0.22 mas[1] |
| Distance | 590 ± 20 ly (180 ± 7 pc) |
| Absolute magnitude (MV) | −1.58[6] |
| Details[7] | |
| Radius | 65.93+2.13 −2.25 R☉ |
| Luminosity | 754.8±52.6 L☉ |
| Surface gravity (log g) | 1.63 cgs |
| Temperature | 3,724±35 K |
| Other designations | |
BD−01° 114, FK5 1022, HD 5112, HIP 4147, HR 248, SAO 129009[8] | |
| Database references | |
| SIMBAD | data |
20 Ceti is a single[9] star located around 590[1] light years away in the equatorial constellationofCetus. It is faintly visible to the naked eye with apparent magnitude is 4.76.[2] The Bright Star Catalogue has this star classified as M0III,[10] 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.[3] It has around 60 times the Sun's radius and is radiating about 800 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,700 K.[7]
