Gamma Ceti

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Gamma Ceti
Diagram showing star positions and boundaries of the Cetus constellation and its surroundings
Cercle rouge 100%.svg

Lokasyon ng γ Ceti (nakabilog) malapit sa gitna
Impormasyon sa pagtingin
Epoka J2000.0      Equinox J2000.0
Konstelasyon Cetus
Kanang asensiyon 02h 43m 18.03910s[1]
Deklinasyon +03° 14′ 08.9390″[1]
Maliwanag na  kalakhan (V) 3.47[2] (3.56/6.63/10.16)[3]
Katangian
Pag-uuring pambituin A3 V + F3 V + K5[3]
U−B sa talatuntunan ng kulay +0.07[2]
B−V sa talatuntunan ng kulay +0.09[2]
Astrometriya
Radyal na hagibis (Rv) –5.1[4] km/s
Tamang mosyon (μ) KA: –146.10[1] mas/yr
Dek.: –146.12[1] mas/yr
Paralaks (π) 40.97 ± 0.63[1] mas
Layo 80 ± 1 st
(24.4 ± 0.4 pc)
Detalye
γ Cet A
Radyos 1.9[5] R
Rotasyonal na hagibis (v sin i) 186[6] km/s
Edad 300[7] Myr
Iba pang pagtatanda
Gam Cet, 86 Ceti, BD+02 422, HD 16970, HIP 12706, HR 804, SAO 110707.[8]

Ang Gamma Ceti (γ Cet, γ Ceti) ay isang sistemang pambituin sa ekwador ng konstelasyong Cetus. Mayroon itong tradisyonal na pangalan na Kaffaljidhma at mayroong maliwanag na kalakhan ng 3.47.[2] Base sa sukatang paralaks, makikita ang lokasyon ng bituin sa layong 80 sinag-taon (24.4 parsec) from Earth.[1]

Etymology[baguhin | baguhin ang batayan]

Nagmula ang pamagat na Kaffaljidhma mula sa salitang Arabiko na الكف الجذماء Al Kaff al Jidhmah, na may kahulugang "Ang putol na maikling kamay".[9] Ayon sa katalogo ng mga bituin sa Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, orihinal na pamagat ang Al Kaff al Jidhmah sa limang bituin: γ Cet bilang Kaffaljidhma, ξ1 Cet bilang Al Kaff al Jidhmah I, ξ2 Cet bilang Al Kaff al Jidhmah II, δ Cet bilang Al Kaff al Jidhmah III at μ Cet bilang Al Kaff al Jidhmah IV (hindi kasama ang α Cet at λ Cet).[10]

Sa Wikang Tsino, tumutukoy ang 天囷 (Tiān Qūn), na may kahulugang Circular Celestial Granary, sa asterismong naglalaman ng γ Ceti, α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti at 66 Ceti. Dahil dito, nakilala ang γ Ceti bilang 天囷八 (Tiān Qūn bā, Ingles: the Eighth Star of Circular Celestial Granary.)[11]

Talababa[baguhin | baguhin ang batayan]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 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 
  2. 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode 1966CoLPL...4...99J 
  3. 3.0 3.1 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 
  4. Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode 1953QB901.W495..... 
  5. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1, http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 . The radius (R*) is given by:
    \begin{align} 2\cdot R_*
 & = \frac{(24.4\cdot 0.74\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
 & \approx 3.88\cdot R_{\bigodot}
\end{align}
  6. Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode 2007A&A...463..671R, doi:10.1051/0004-6361:20065224 
  7. Su, K. Y. L. et al. (December 2006), "Debris Disk Evolution around A Stars", The Astrophysical Journal 653 (1): 675–689, arXiv:astro-ph/0608563, Bibcode 2006ApJ...653..675S, doi:10.1086/508649 
  8. "LTT 10892 -- High proper-motion Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gamma+Ceti, hinango noong 2012-03-04 
  9. Allen, Richard Hinckley (1963), Star Names: Their Lore and Meaning (Dover ed.), University of Chicago, p. 160, http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Cetus*.html 
  10. Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology, http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf 
  11. (Tsino) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日


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