9 Ceti (original) (raw)
9 Ceti è una stella nana gialla nella sequenza principale di magnitudine 6,38 situata nella costellazione della Balena. Dista 66 anni luce dal sistema solare.
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| dbo:abstract | 9 Ceti is a star in the equatorial constellation of Cetus. It has the variable star designation BE Ceti, while 9 Ceti is the Flamsteed designation. It has an apparent visual magnitude of 6.4, which is below the limit that can be seen with the naked eye by a typical observer. (According to the Bortle scale, it is possible for some observers to see it from dark rural skies.) Based upon parallax measurements, this star is 69.6 light years away from the Sun. This is a solar analog, which is defined as a "Population I dwarf with gross properties not very different from those of the Sun". It is a G-type main sequence star with a stellar classification of G3 V, which means it is generating energy through the fusion of hydrogen into helium at its core. The mass and radius of the star are similar to the Sun, although the abundance of elements other than hydrogen and helium is about 50% greater. It is much younger than the Sun, being an estimated 850 million years of age. The effective temperature of the stellar atmosphere is around 5,807 K, giving it the yellow-hued glow of a G-type star. In 1980, this was found to be a variable star with a periodicity of 7.655 days, and it was given variable star designation BE Ceti. This variation in luminosity was interpreted to be the result of rotational modulation of star spot activity in the photosphere, and hence it is classified as a BY Draconis variable. There is considerable variation in the strength of the surface activity—to the point where it has appeared inactive during some observation runs. The strength of the surface magnetic field was measured to be 450 G. The spectrum of this star includes lines of titanium oxide and calcium hydride, which, for a star of this class, is further evidence of star spot activity. Star spots cover an estimated 3% of the surface. 9 Ceti has been examined for evidence of a planetary companion or a debris disk, but as of 2015 none has been found. The age of the star and its motion through space suggest that it is a member of the Hyades stellar kinematic group. There is a magnitude 12.57 optical companion at an angular separation of 214 arc seconds from 9 Ceti along a position angle of 294° (as of 1999). The pair are not physically associated as they have different proper motions and the fainter star has a much smaller parallax. (en) 9 Ceti (9 Cet / HD 1835 / HR 88 / HIP 1803) es una estrella variable de magnitud aparente +6,38. Se localiza en el rincón suroeste de la constelación de Cetus, al suroeste de ι Ceti, noroeste de Deneb Kaitos (β Ceti) y al norte de 6 Ceti.Se encuentra a 66 años luz de distancia del Sistema Solar. 9 Ceti es una enana amarilla de tipo espectral G3V con una temperatura efectiva de 5767 K.Ligeramente más luminosa que el Sol, su diámetro es algo más grande que el de nuestra estrella —aproximadamente un 10% mayor—, aunque su masa parece ser algo inferior a la masa solar, equivalente al 93% de la misma.Presenta una metalicidad un 44% mayor que la del Sol, observándose la misma tendencia en otros elementos como magnesio, níquel y silicio. A diferencia del Sol, cuya edad es de 4600 millones de años, 9 Ceti es una estrella muy joven, con una edad de sólo 600 millones de años. Su edad estimada mediante girocronología es incluso inferior, en torno a 400 millones de años. Está clasificada como una variable BY Draconis, recibiendo la denominación de variable BE Ceti; la variabilidad tiene su origen en la presencia de manchas oscuras que entran y salen del campo de visión debido a la rápida rotación, ya que el período de rotación es de 7,7 días.Se conocen dos ciclos de actividad cromosférica de 9,1 y 6,7 años, pudiendo existir superpuesto a ellos un ciclo más largo de 25 años. (es) 9 Ceti è una stella nana gialla nella sequenza principale di magnitudine 6,38 situata nella costellazione della Balena. Dista 66 anni luce dal sistema solare. (it) くじら座9番星 (9 Ceti, 9 Cet) とは、太陽系からくじら座の方角に67光年離れた位置にある太陽に似た恒星である。HD 1835 やくじら座BE星 (BE Ceti) とも呼ばれる。 (ja) BE Кита (лат. BE Ceti) — звезда, которая находится в созвездии Кит на расстоянии около 66 световых лет от нас. Видимая звёздная величина звезды составляет +6.39, то есть не видна невооружённым глазом. (ru) 9 Ceti, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den västra delen av stjärnbilden Valfisken och har även variabelbeteckningen BE Ceti. Den har en skenbar magnitud på 6,39 och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 47,9 mas, beräknas den befinna sig på ett avstånd på ca 68 ljusår (ca 21 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –2,7 km/s. Stjärnan har undersökts för bevis på en exoplanet eller en omgivande stoftskiva, men år 2015 har ingen hittats. Stjärnans ålder och dess rörelse genom rymden tyder på att den ingår i Hyadernas rörelsegrupp. (sv) 鯨魚座9，又名BD-13 60，HD 1835、SAO 147237、HR 88，是鯨魚座的一颗恒星，视星等为6.39，位于銀經97.34，銀緯-73.64，其B1900.0坐标为赤經0h 17m 44.3s，赤緯-12° -73.64′ 57″。 (zh) |
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| rdfs:comment | 9 Ceti è una stella nana gialla nella sequenza principale di magnitudine 6,38 situata nella costellazione della Balena. Dista 66 anni luce dal sistema solare. (it) くじら座9番星 (9 Ceti, 9 Cet) とは、太陽系からくじら座の方角に67光年離れた位置にある太陽に似た恒星である。HD 1835 やくじら座BE星 (BE Ceti) とも呼ばれる。 (ja) BE Кита (лат. BE Ceti) — звезда, которая находится в созвездии Кит на расстоянии около 66 световых лет от нас. Видимая звёздная величина звезды составляет +6.39, то есть не видна невооружённым глазом. (ru) 鯨魚座9，又名BD-13 60，HD 1835、SAO 147237、HR 88，是鯨魚座的一颗恒星，视星等为6.39，位于銀經97.34，銀緯-73.64，其B1900.0坐标为赤經0h 17m 44.3s，赤緯-12° -73.64′ 57″。 (zh) 9 Ceti is a star in the equatorial constellation of Cetus. It has the variable star designation BE Ceti, while 9 Ceti is the Flamsteed designation. It has an apparent visual magnitude of 6.4, which is below the limit that can be seen with the naked eye by a typical observer. (According to the Bortle scale, it is possible for some observers to see it from dark rural skies.) Based upon parallax measurements, this star is 69.6 light years away from the Sun. (en) 9 Ceti (9 Cet / HD 1835 / HR 88 / HIP 1803) es una estrella variable de magnitud aparente +6,38. Se localiza en el rincón suroeste de la constelación de Cetus, al suroeste de ι Ceti, noroeste de Deneb Kaitos (β Ceti) y al norte de 6 Ceti.Se encuentra a 66 años luz de distancia del Sistema Solar. (es) 9 Ceti, som är stjärnans Flamsteed-beteckning, är en ensam stjärna belägen i den västra delen av stjärnbilden Valfisken och har även variabelbeteckningen BE Ceti. Den har en skenbar magnitud på 6,39 och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 47,9 mas, beräknas den befinna sig på ett avstånd på ca 68 ljusår (ca 21 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –2,7 km/s. (sv) |
| rdfs:label | 9 Ceti (en) 9 Ceti (es) 9 Ceti (it) くじら座9番星 (ja) BE Кита (ru) 9 Ceti (sv) 八魁五 (zh) |
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