Английская Википедия:Delta Ceti

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Delta Ceti, Latinized from δ Ceti, is a single, blue-white hued star in the equatorial constellation of Cetus. The star's apparent visual magnitude of +4.06 means it is near to the cusp of the faintest third of the stars that are visible the ideally-placed naked eye. It is Шаблон:Val north of the celestial equator compared to the celestial north pole's Шаблон:Val. The star is positioned about Шаблон:Val WNW of the spiral galaxy M77, but which at apparent magnitude 9.6 needs magnification to be made out and has an apparent size of only Шаблон:Val by Шаблон:Val.

Based upon an annual parallax shift of Шаблон:Val as seen from Earth, it is around Шаблон:Val from the Sun. Motion relative to our system's trajectory includes a highly parting vector: with a net radial velocity of about Шаблон:Val. It moves minutely across the celestial sphere – yet just over four times more in right ascension than in declination.

Файл:DeltaCetLightCurve.png

A light curve for Delta Ceti, plotted from TESS data

This is a Beta Cephei variable with a stellar classification of B2 IV. It varies in brightness with a period of 0.16114 days. Unlike most stars of its type, it does not display multiple periods of luminosity variation or multiple variations of its spectral line profiles. The star is about 7−18 million years and has a low projected rotational velocity of around Шаблон:Val, suggesting it is either rotating slowly or is being viewed from nearly pole on. It has 8.4 times the mass of the Sun and 4.6 times the Sun's radius. The star is radiating around 4,000 times the Sun's luminosity from its photosphere at an effective temperature of roughly Шаблон:Val

Name

This star, along with α Cet (Menkar), λ Cet (Menkar), γ Cet (Kaffaljidhma), μ Cet, ξ¹ Cet and ξ² Cet were Al Kaff al Jidhmah, "the Part of a Hand".

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kaff al Jidhmah were the title for five stars :γ Cet as Kaffaljidhma, ξ¹ Cet as Al Kaff al Jidhmah I, ξ² Cet as Al Kaff al Jidhmah II, δ Cet as Al Kaff al Jidhmah III and μ Cet as Al Kaff al Jidhmah IV (exclude α Cet and λ Cet.)

In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Circular Celestial Granary, refers to an asterism consisting of δ Ceti, α Ceti, κ¹ Ceti, λ Ceti, μ Ceti, ξ¹ Ceti, ξ² Ceti, ν Ceti, γ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, the Chinese name for δ Ceti itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en.)

External links

• Шаблон:Cite simbad