75 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 32m 09.42241s |
| Declination | −01° 02′ 05.6166″ |
| Apparent magnitude (V) | +5.36 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K1 III or G3 III |
| B−V color index | +1.004±0.002 |
| Astrometry | |
| Radial velocity (Rv) | −6.34±0.13 km/s |
| Proper motion (μ) | RA: −23.268 mas/yr Dec.: −30.987 mas/yr |
| Parallax (π) | 12.1717±0.0962 mas |
| Distance | 268 ± 2 ly (82.2 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.808 |
| Details | |
| Mass | 1.92+0.07 −0.08 M☉ |
| Radius | 10.57+0.17 −0.16 R☉ |
| Luminosity | 51.8+1.5 −2.5 L☉ |
| Surface gravity (log g) | 2.67±0.04 cgs |
| Temperature | 4,830±20 K |
| Metallicity [Fe/H] | +0.10+0.08 −0.05 dex |
| Rotational velocity (v sin i) | 3.2±0.5 km/s |
| Age | 1.41±0.01 Gyr |
| Other designations | |
| 75 Cet, BD−01°353, GC 3043, HD 15779, HIP 11791, HR 739, SAO 129959 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
75 Ceti is a star in the equatorial constellation of Cetus with at least two planets. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.36. The star is located 268 light-years (82 parsecs) distant from the Sun, based on parallax, but is drifting closer with a radial velocity of −6 km/s.
In Chinese, 天囷 (Tiān Qūn), meaning Circular Celestial Granary, refers to an asterism consisting of α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, 75 Ceti itself is known as the Tenth Star of Circular Celestial Granary.
This is an aging giant star with a stellar classification of K1 III, having exhausted the supply of hydrogen at its core and expanded to 10.6 times the Sun's radius, or 0.05 AU. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at the core. The star is 1.4 billion years old with 1.9 times the Sun's mass. It is radiating 56 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,846 K. There is a companion star just over half the Sun's mass at a separation of 11.5 arcseconds, corresponding to 958 AU.