| absmag_v = −1.16[11]
}}{{Starbox orbit
| reference = [12]
| period_unitless = {{Val|2722|14|fmt=commas|u=d}}
| eccentricity = {{Val|0.0|0.7}}
| periastron = {{nowrap|2444852 ± 29 JD}}
| periarg = 0.0
| k1 = {{Val|4.33|0.25}}
}}{{Starbox detail
| source = [13]
| component1 = π Cet A
| mass = {{Val|4.4|0.2}}
| radius = {{Val|4.3|0.3}}
| luminosity = 468
| temperature = {{Val|12900|400|fmt=commas}}
| gravity = {{Val|3.8|0.2}}
| metal_fe = {{Val|0.28|0.16}}[14]
| rotational_velocity = {{Val|20.9|1.2}}
| age_myr = {{Val|0.3|0.1|0.1}}
}}{{Starbox catalog
| names = π Cet, 89 Ceti, BD−14 519, FK5 97, HD 17081, HIP 12770, HR 811, SAO 148575.[15]
}}{{Starbox reference
| Simbad = pi+Cet
}}{{Starbox end}}Pi Ceti, Latinized from π Ceti, is the Bayer designation for a star system in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.238.[3] Based upon an annual parallax shift of 8.30 mas,[ it is located around 393 light years from the Sun.]
This is a single-lined spectroscopic binary system with a nearly circular orbit and a period of 7.45 years. The fact that the system has a negligible eccentricity is surprising for such a long period, and may suggest that the secondary is a white dwarf that had its orbit circularized during a mass-transfer event.[12]
The primary, component A, is a normal B-type star[13] that has been given stellar classifications of B7 V[4] and B7 IV.[5] It appears very young – less than half a million years in age – and may still be on a pre-main sequence track. The star shows no magnetic field but it does emit an infrared excess.[13]
Name
This star, along with ε Cet, ρ Cet and σ Cet, was Al Sufi's Al Sadr al Ḳaiṭos, the Whale's Breast [1]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sadr al Ḳaiṭos were the title for four stars :ρ Cet as Al Sadr al Ḳaiṭos I, σ Cet as Al Sadr al Ḳaiṭos II, ε Cet as Al Sadr al Ḳaiṭos III and π Cet as Al Sadr al Ḳaiṭos IV[2]
In Chinese, {{lang|zh|天苑}} ({{lang|zh-Latn|Tiān Yuàn}}), meaning Celestial Meadows, refers to an asterism consisting of π Ceti, γ Eridani, π Eridani, δ Eridani, ε Eridani, ζ Eridani, η Eridani, τ1 Eridani, τ2 Eridani, τ3 Eridani, τ4 Eridani, τ5 Eridani, τ6 Eridani, τ7 Eridani, τ8 Eridani and τ9 Eridani. Consequently, δ Ceti itself is known as {{lang|zh|天苑七}} ({{lang|zh-Latn|Tiān Yuàn qī}}, {{lang-en|the Seventh Star of Celestial Meadows}}.)[3]
References
1. ^{{cite book | last=Allen | first=R. H. | date=1963 | authorlink=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Cetus*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc. | location=New York | isbn=0-486-21079-0 | page=162 }}
2. ^[https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971]
3. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 12 日
4. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
5. ^1 2 3 {{citation | title=Chemical abundances of magnetic and non-magnetic Herbig Ae/Be stars | display-authors=1 | last1=Folsom | first1=C. P. | last2=Bagnulo | first2=S. | last3=Wade | first3=G. A. | last4=Alecian | first4=E. | last5=Landstreet | first5=J. D. | last6=Marsden | first6=S. C. | last7=Waite | first7=I. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=422 | issue=3 | pages=2072–2101 | date=May 2012 | doi=10.1111/j.1365-2966.2012.20718.x | bibcode=2012MNRAS.422.2072F | arxiv=1202.1845 | postscript=. }}
6. ^1 2 {{citation | title=The Spectroscopic Orbit of Pi Ceti | display-authors=1 | last1=Lacy | first1=C. H. S. | last2=Fekel | first2=F. C. | last3=Mathieu | first3=R. D. | last4=Morrell | first4=N. I. | last5=Morse | first5=J. A. | last6=Torres | first6=G. | last7=Willmarth | first7=D. | journal=Astronomical Journal | postscript=. | volume=113 | page=1088 | date=March 1997 | doi=10.1086/118325 | bibcode=1997AJ....113.1088L }}
7. ^1 2 {{citation | display-authors=1 | last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F. | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | page=349 | date=April 2010 | doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H | arxiv=1003.2335 | postscript=. }}
8. ^1 {{citation | last1=Prugniel | first1=Ph. | last2=Vauglin | first2=I. | last3=Koleva | first3=M. | title=The atmospheric parameters and spectral interpolator for the MILES stars | journal=Astronomy & Astrophysics | volume=531 | page=A165 | date=July 2011 | doi=10.1051/0004-6361/201116769 | bibcode=2011A&A...531A.165P | postscript=. | arxiv=1104.4952 }}
9. ^1 2 {{citation | last=Buscombe | first=W. | title=Spectral classification of Southern fundamental stars | journal=Mount Stromlo Observatory Mimeogram | volume=4 | year=1962 | bibcode=1962MtSOM...4....1B | postscript=. }}
10. ^1 2 3 4 {{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G | postscript=. }}
11. ^1 {{citation | title=pi. Cet -- Spectroscopic binary | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi.+Cet | accessdate=2017-02-08 | postscript=. }}