Nu Ceti
 Location of ν Ceti (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Cetus |
| Right ascension | 02h 35m 52.473s |
| Declination | +05° 35′ 35.69″ |
| Apparent magnitude (V) | 4.86 |
| Characteristics | |
| Spectral type | G8III |
| U−B color index | 0.52 |
| B−V color index | 0.88 |
| Astrometry | |
| Radial velocity (Rv) | 4.81±0.02 km/s |
| Proper motion (μ) |
RA: −26.51±0.25 mas/yr Dec.: −22.32±0.22 mas/yr |
| Parallax (π) | 9.59 ± 0.23mas |
| Distance | 340 ± 8 ly (104 ± 3 pc) |
| Absolute magnitude (MV) | −0.415 |
| Orbit | |
| Primary | Nu CetiA |
| Companion | Nu CetiB |
| Period (P) | 714.48±0.15 days |
| Eccentricity (e) | 0.274±0.005 |
| Periastron epoch (T) | 53364.9±1.9 |
|
Argument of periastron (ω) (secondary) |
119.5±1.1° |
|
Semi-amplitude (K1) (primary) |
5.09±0.03 km/s |
| Details | |
| Mass | 1.1 M☉ |
| Temperature | 4800 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu Ceti (ν Ceti), is a spectroscopic binary located in the constellation Cetus. Nu Ceti is believed to be part of the Ursa Major stream.
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, ν Ceti itself is known as the Seventh Star of Circular Celestial Granary, Tiān Qūn Qī.
The companion to Nu Ceti A is ν Ceti B, an F7V dwarf star with 9.08 apparent visual magnitude and located 8.1 arcsec away. It was discovered by Struve.
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