75 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ceti |
| Right ascension | 02h 32m 09.0s |
| Declination | −01° 02′ 06″ |
| Apparent magnitude (V) | +5.36 |
| Characteristics | |
| Spectral type | G3 III |
| Astrometry | |
| Parallax (π) | 12.27 ± 1.13 mas |
| Distance | ? ly (81.5 ± 7.51[1] pc) |
| Details | |
| Mass | 2.49 (2.22–2.51) M☉ |
| Radius | 10.5 (9.5–11.5) R☉ |
| Luminosity | 53.7 L☉ |
| Surface gravity (log g) | 2.63±0.05 cgs |
| Temperature | 4846±18 K |
| Metallicity | +0.00±0.04 |
| Age | ? years |
| Other designations | |
HD 15779, HIP 11791 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
75 Ceti is a G-type giant with one known planet, 75 Ceti b.
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.[2]
The planet's discoverers consider this planet b "typical" of gas giants.[3] Note that (like many recorded planets) b takes in much more insolation than does Jupiter and, indeed, Earth.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >3 MJ | 2.1 | 691.9 ± 3.6 | 0.117 ± 0.048 | — | — |
There may be additional periodic factors in the data, corresponding to m sin i of around 0.4 MJ and 1 MJ, at distances of ∼0.9 AU and ∼4 AU. If these are confirmed, they are more irradiated than Earth as well.
References
- ^ "75 Ceti b".
- ^ Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
- ^ a b "Substellar Companions to Seven Evolved Intermediate-Mass Stars". PASJ. 2012. arXiv:1207.3141.
{{cite journal}}: Unknown parameter|authors=ignored (help) - ^ Square root of luminosity means that an Earth like planet would have to be >7 AU from the star.
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