| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 24m 01.40528s [1] |
| Declination | −08° 10′ 59.7212″ [1] |
| Apparent magnitude (V) | 3.60 [2] |
| Characteristics | |
| Spectral type | K0 III [3] |
| B−V color index | +1.07 [2] |
| Astrometry | |
| Radial velocity (Rv) | +17.2±0.5 [4] km/s |
| Proper motion (μ) |
RA: −77.94
[1]
mas/
yr Dec.: −206.53 [1] mas/ yr |
| Parallax (π) | 28.66 ± 0.19 mas [1] |
| Distance | 113.8 ± 0.8
ly (34.9 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.89 [5] |
| Details [2] | |
| Mass | 1.80 [6] M☉ |
| Radius | 10.04 R☉ |
| Luminosity | 53 L☉ |
| Surface gravity (log g) | 2.70 cgs |
| Temperature | 4,660±17 [6] K |
| Metallicity [Fe/H] | −0.13±0.15 dex |
| Rotational velocity (v sin i) | 2.60 km/s |
| Age | 2.20 [6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Ceti, Latinized from θ Ceti, is a solitary, [8] orange-hued star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 3.60. [2] Based upon an annual parallax shift of 28.66 mas as seen from Earth, [1] it is located about 114 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.10 due to interstellar dust. [2]
With an age of about 2.2 billion years, [6] this is an evolved, K-type giant star with a stellar classification of K0 III. [3] It is a red clump [9] star on the horizontal branch, [2] which means it is generating energy through helium fusion at its core. [9] The star has an estimated 1.8 [6] times the mass of the Sun and has expanded to 10 times the Sun's radius. [2] It is radiating 53 [2] times the solar luminosity from its photosphere at an effective temperature of 4,660 K. [6]
Name
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Thanih al Naamat (ثاني النعامات - thānī al-naʽāmāt), which was translated into Latin as Secunda Struthionum, meaning the second ostrich. [10] This star, along with η Cet (Deneb Algenubi), τ Cet (Thalath Al Naamat), ζ Cet (Baten Kaitos) and υ Cet, were Al Naʽāmāt (النعامات), the Hen Ostriches. [11] [12]
In Chinese, 天倉 (Tiān Cāng), meaning Square Celestial Granary, refers to an asterism consisting of θ Ceti, ι Ceti, η Ceti, ζ Ceti, τ Ceti and 57 Ceti. [13] Consequently, the Chinese name for θ Ceti itself is 天倉三 (Tiān Cāng sān, English: the Third Star of Square Celestial Granary). [14]
References
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d e f g h Jones, M. I.; et al. (December 2011), "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties", Astronomy & Astrophysics, 536: 7, arXiv: 1110.6459, Bibcode: 2011A&A...536A..71J, doi: 10.1051/0004-6361/201117887, S2CID 55769003, A71.
- ^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode: 1999MSS...C05....0H.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ "tet Cet -- Horizontal Branch Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-25.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Laney, C. D.; et al. (January 2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637–1641, arXiv: 1109.4800, Bibcode: 2012MNRAS.419.1637L, doi: 10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.
- ^ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society, 55: 429, Bibcode: 1895MNRAS..55..429K, doi: 10.1093/mnras/55.8.429.
- ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc, p. 162, ISBN 0-486-21079-0, retrieved 2017-04-26.
- ^ η Cet as Aoul al Naamat or Prima Struthionum (the first ostrich), θ Cet as Thanih al Naamat or Secunda Struthionum (the second ostrich), τ Cet as Thalath al Naamat or Tertia Struthionum (the third ostrich), and ζ Cet as Rabah al Naamat or Quarta Struthionum (the fourth ostrich). υ Cet should be Khamis al Naamat or Quinta Struthionum (the fifth ostrich) consistently, but Al Achsasi Al Mouakket designated the title the fifth ostrich to γ Gam with uncleared consideration.
- ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日
