Gamma Ceti

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γ Ceti
Diagram showing star positions and boundaries of the Cetus constellation and its surroundings
Location of γ Ceti (circled)
Observation data
J2000.0
Constellation
Cetus
Right ascension 02h 43m 18.03910s[1]
Declination +03° 14′ 08.9390″[1]
Apparent magnitude (V) 3.47[2] (3.56/6.63/10.16)[3]
Characteristics
Spectral type A3 V + F3 V + K5[3]
U−B color index +0.07[2]
B−V color index +0.09[2]
Distance
80 ± 1 ly
(24.4 ± 0.4 pc)
Absolute magnitude (MV)+1.53[5]
Details
γ Cet A
Rotational velocity (v sin i)
10[8] km/s
SAO 110707, WDS 02433+0314[11]
Database references
SIMBADGamma Ceti system
A
B
C

Gamma Ceti (γ Ceti, abbreviated Gamma Cet, γ Cet) is a

apparent visual magnitude of 3.47.[2] Based upon parallax measurements, this star is located at a distance of about 80 light-years (24.4 parsecs) from the Sun.[1]

The three components are designated Gamma Ceti A (officially named Kaffaljidhma /ˌkæfəlˈdʒɪdmə/, the traditional name for the entire system),[12] B and C.

Nomenclature

γ Ceti (

multiple star systems, and adopted by the International Astronomical Union (IAU).[13] The close pair AB is also designated HIP 12706, HD 16970, and HR 804. The system of A, B, and C is collectively designated GJ 106.1 in the Gliese Catalogue of Nearby Stars
.

Gamma Ceti bore the traditional names of Al Kaff al Jidhmah or Kaffaljidhma, derived from

Arabic: الكف الجذماء al-kaf al-jaðmāʾ ('the cut-short hand').[14] According to a 1971 NASA memorandum, Al Kaff al Jidhmah was originally the title for five stars: Gamma Ceti as Kafaljidma, Xi1 Ceti as Al Kaff al Jidhmah I, Xi2 Ceti as Al Kaff al Jidhmah II, Delta Ceti as Al Kaff al Jidhmah III and Mu Ceti as Al Kaff al Jidhmah IV (excluding Alpha Ceti and Lambda Ceti).[15] The IAU Working Group on Star Names (WGSN)[16] approved the name Kaffaljidhma for the component Gamma Ceti A on February 1, 2017.[12]

In

Chinese name for Gamma Ceti itself is 天囷八 Tiān Qūn bā ('the Eighth Star of Circular Celestial Granary').[17]

Triple system

Gamma Ceti appears to be a

F-type main sequence star that has a classification of F3 V and a magnitude of 6.6.[3] The contrasting colors of these two stars makes them a popular target of amateur astronomers. The two can be resolved with a small, 4 in (10 cm) aperture telescope under ideal seeing conditions, although at times they can be a challenge to resolve even with a much larger scope.[19]

At a wide separation of 840 arcseconds is component C, a dim, magnitude 10.2

spectral classification of K5V.[22]
There are several other stars brighter and closer to Gamma Ceti than BD+02 418 – BD+02 419, HD 16985, and TYC 50-1274-1 – but they are all more distant background stars.

Properties

The measured

Ursa Major Moving Group.[26] The primary has been examined for an excess of infrared emission that would suggest the presence of circumstellar matter, but none was found.[25]

References

  1. ^
    doi:10.1051/0004-6361:20078357
    .
  2. ^
    Bibcode:1966CoLPL...4...99J
    .
  3. ^
    S2CID 14878976
    .
  4. Bibcode:1953GCRV..C......0W
    .
  5. ^
    S2CID 119257644
    .
  6. ^
    doi:10.1093/mnras/stv2825
    .
  7. ^
    ISBN 978-3-540-29692-8
    .
    The radius (R*) is given by:
  8. ^
    S2CID 119179065
    .
  9. doi:10.1086/378365
    .
  10. S2CID 18475298
    .
  11. ^ "gam Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-03-04.
  12. ^ a b "Naming Stars". International Astronomical Union. Archived from the original on 2017-12-22. Retrieved 16 December 2017.
  13. arXiv:1012.0707 [astro-ph.SR
    ].
  14. ISBN 0-486-21079-0 – via LacusCurtius
    .
  15. ^ Rhoads, Jack W. (15 November 1971). Technical Memorandum 33-507: A reduced star catalog containing 537 named stars (PDF). Jet Propulsion Laboratory (Report). NASA. NASA-CR-124573. Archived from the original (PDF) on 2019-06-12. Retrieved 2018-02-03.
  16. ^ "Division C WG Star Names". International Astronomical Union. Archived from the original on 2017-08-02. Retrieved 2017-04-01.
  17. ^ 陳冠中; 陳輝樺 (11 July 2006). "中國古代的星象系統 (72): 胃宿天區". AEEA 天文教育資訊網 [AEEA (Activities of Exhibition and Education in Astronomy)] (in Chinese). National Museum of Natural Science. Archived from the original on 2020-10-02.
  18. ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I. (2 October 2008). "Washington Double Star Catalog". United States Naval Observatory. Archived from the original on 14 February 2011. Retrieved 2 January 2018.
  19. ISBN 978-1-84628-216-4
    .
  20. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  21. S2CID 661494
    .
  22. doi:10.1086/114146
    .
  23. doi:10.1051/0004-6361:20042039
    .
  24. doi:10.1051/0004-6361:20077429
    .
  25. ^
    S2CID 14116473
    .
  26. doi:10.1086/368241
    – via TigerPrints.

External links
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