Xi1 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 12m 59.995s[1] |
| Declination | +08° 50′ 48.16″[1] |
| Apparent magnitude (V) | +4.37 [combined] |
| Characteristics | |
| Spectral type | G, 6 or 8, III[2] |
| Astrometry | |
| Proper motion (μ) | RA: –26.87 ± 0.48[1] mas/yr Dec.: –17.23 ± 0.36[1] mas/yr |
| Parallax (π) | 8.51 ± 0.51[1] mas |
| Distance | 380 ± 20 ly (118 ± 7 pc) |
| Absolute magnitude (MV) | –0.866[2] |
| Details | |
| Mass | 4[2] M☉ |
| Radius | 1.7[2] R☉ |
| Luminosity | 190[2] L☉ |
| Temperature | 4200[2] K |
| Age | 300[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Xi1 Ceti (ξ1 Ceti), is a binary system located in the constellation Cetus, suspected as a ternary.
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, Xi1 Ceti itself is known as the Fifth Star of Circular Celestial Granary, Tiān Qūn Wu.[3]
The spectroscopic binary nature of Xi1 Ceti was discovered in 1901 by William Wallace Campbell using the Mills spectrograph at the Lick Observatory.[4][5] The primary Ceti A is a G6III or G8III clump-giant star. The spectroscopic binary companion star is an A2V dwarf of about 2 solar masses and 30 luminosity. It is separated at 0.012 arcsec so in an orbit of 4.2 AU, smaller than the distance between Jupiter and the Sun.
Xi1 Ceti A exhibits characteristics similar to an eclipsing binary, with a small white dwarf companion. Occultations with the moon have not yet confirmed the existence of the second suspected companion.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
