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 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry - 1 2 3 4 5 6 7 Jim Kaler (Dec 21, 2007). "Xi-1 Ceti".
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
- ↑ Campbell, William Wallace (1901). "Some recent results secured with the Mills spectrograph". Lick Observatory bulletin. 1 (4): 22–25. Bibcode:1901LicOB...1...22C. doi:10.5479/ADS/bib/1901LicOB.1.22C.
- ↑ Griffin, R. F.; Herbig, G. H. (1981). "Spectroscopic Orbits of Xi Piscium 60 Andromedae and ξ1 Ceti". Monthly Notices of the Royal Astronomical Society. 196: 33–43. Bibcode:1981MNRAS.196...33G. doi:10.1093/mnras/196.1.33.
- http://server3.wikisky.org/starview?object_type=1&object_id=979
- http://www.alcyone.de/cgi-bin/search.pl?object=HR0649