Delta Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 39m 28.956s |
| Declination | +00° 19′ 42.63″ |
| Apparent magnitude (V) | +4.08 |
| Characteristics | |
| Spectral type | B2 IV |
| Variable type | β Cep |
| Astrometry | |
| Proper motion (μ) |
RA: 12.85 ± 0.17 mas/yr Dec.: –2.94 ± 0.11 mas/yr |
| Parallax (π) | 5.02 ± 0.15mas |
| Distance | 650 ± 20 ly (199 ± 6 pc) |
| Details | |
| Mass | 8.4 ± 0.7 M☉ |
| Radius | 4.6 ± 0.8 R☉ |
| Luminosity | 4,000 L☉ |
| Surface gravity (log g) | 4.05 ± 0.20 cgs |
| Temperature | 21,900 ± 1,000 K |
| Rotational velocity (v sin i) | 7 ± 4 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Ceti (δ Ceti, δ Cet) is a Class B2, fourth-magnitude star in the constellation Cetus.
Delta Ceti is positioned very near the celestial equator and is located about 0.74 degrees WNW of the spiral galaxy M77. Delta Ceti is a blue giant star located about 660 light-years from Earth.
It is a Beta Cephei variable.
This star, along with α Cet (Menkar), λ Cet (Menkar), γ Cet (Kaffaljidhma), μ Cet, ξ1 Cet and ξ2 Cet were Al Kaff al Jidhmah, "the Part of a Hand".
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kaff al Jidhmah were the title for five stars :γ Cet as Kaffaljidhma, ξ1 Cet as Al Kaff al Jidhmah I, ξ2 Cet as Al Kaff al Jidhmah II, δ Cet as Al Kaff al Jidhmah III and μ Cet as Al Kaff al Jidhmah IV (exclude α Cet and λ Cet.)
In Chinese, 天囷 (Tiān Qūn), meaning Circular Celestial Granary, refers to an asterism consisting of δ Ceti, α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, δ Ceti itself is known as 天囷九 (Tiān Qūn jiǔ, English: the Ninth Star of Circular Celestial Granary.)
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