20 Ceti
Star in the constellation Cetus
From Wikipedia, the free encyclopedia
20 Ceti is a single[11] star located around 590[2] light years away in the equatorial constellation of Cetus. It is faintly visible to the naked eye with apparent magnitude is 4.76.[3] The Bright Star Catalogue has this star classified as M0III,[12] 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.[4] It has around 66 times the Sun's radius and is radiating about 750 times the Sun's luminosity[9] from its enlarged photosphere at an effective temperature of 4,065 K.[8]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 00h 53m 00.49452s[2] |
| Declination | −01° 08′ 39.3317″[2] |
| Apparent magnitude (V) | 4.76[3] |
| Characteristics | |
| Spectral type | K5 III[4] |
| U−B color index | +1.91[5] |
| B−V color index | +1.56[5] |
| Astrometry | |
| Radial velocity (Rv) | +16.22±0.28[6] km/s |
| Proper motion (μ) | RA: +6.99[2] mas/yr Dec.: −15.66[2] mas/yr |
| Parallax (π) | 5.56±0.22 mas[2] |
| Distance | 590 ± 20 ly (180 ± 7 pc) |
| Absolute magnitude (MV) | −1.58[7] |
| Details | |
| Mass | 1.1[8] M☉ |
| Radius | 65.93+2.13 −2.25[9] R☉ |
| Luminosity | 754.8±52.6[9] L☉ |
| Surface gravity (log g) | 1.61[8] cgs |
| Temperature | 4,065[8] K |
| Metallicity [Fe/H] | −0.19[8] dex |
| Other designations | |
| BD−01°114, FK5 1022, HD 5112, HIP 4147, HR 248, SAO 129009[10] | |
| Database references | |
| SIMBAD | data |
