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BK Camelopardalis (BK Cam) es una estrella … BK Camelopardalis (BK Cam) es una estrella de magnitud aparente +4,73 encuadrada en la constelación boreal de Camelopardalis, la jirafa.Se encuentra a una distancia de 762 años luz, de acuerdo a la nueva reducción de los datos de paralaje del satélite Hipparcos (4,28 ± 0,48). BK Camelopardalis es una estrella blanco-azulada de la secuencia principal de tipo espectral B2.5Vne.Tiene una temperatura superficial, una vez corregida por el oscurecimiento gravitatorio, de 20.843 K.Su radio estimado es 4,5 veces más grande que el del Sol y gira sobre sí misma con una velocidad de rotación proyectada de 341 km/s.La inclinación de su eje de rotación respecto a la línea de visión es de 66,7º.Posee una masa de 7,5 masas solares y una edad de 31,6 ± 5,1 millones de años. BK Camelopardalis es una estrella binaria, cuya duplicidad ha sido resuelta mediante interferometría de moteado.Es una estrella Be y mostraba variaciones espectroscópicas con un período de aproximadamente 4,5 años, antes de entrar en un estado de inactividad que duró de 1938 a 1961.Se halla rodeada por una envoltura gruesa en longitudes de onda del infrarrojo.Además, parece ser ligeramente variable —su amplitud de variación sería de 0,057 magnitudes— a corto plazo (0,108 días).7 magnitudes— a corto plazo (0,108 días).
, BK Camelopardalis is a variable star in th … BK Camelopardalis is a variable star in the northern circumpolar constellation of Camelopardalis, near the constellation border with Cassiopeia. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude that fluctuates around 4.74. The star is located approximately 540 light years away from the Sun based on parallax. It is a proposed member of the Cassiopeia–Taurus group of co-moving stars. This is a main sequence Be star with a stellar classification of B2.5 Vne, where the 'n' suffix indicates "nebulous" (broad) lines due to rapid rotation. The presence of emission lines in the spectrum has been known since at least 1895. Spectrograms of the star have been taken since 1905, providing a long history of its cycles of variation. It ranges in brightness from a peak of 4.76 down to 4.90. BK Camelopardalis is 32 million years old and is spinning with a projected rotational velocity of 328 km/s. It has 7.5 times the mass of the Sun and four times the Sun's radius. The star is radiating 1,081 times the luminosity of the Sun from its photosphere at an effective temperature of 18,720 K. This star lies at the center of a circular, disk-like structure spanning 1.4°, which may be a "magnetic funnel-like structure" that is emitting in the radio band. Neutral hydrogen along the trajectory of this star has been found to be deficient, which may be the result of ionizing radiation from the star. Two stars have been resolved close to BK Camelopardalis. The first, designated Ab, is separated by about 0.13 arcseconds. If it is physically associated with BK Camelopardalis, it would have an orbital period of several decades. The second star is designated as B but is likely an optical pair with the central BK Camelopardalis; that is, a chance alignment.melopardalis; that is, a chance alignment.
, 上丞(鹿豹座BK)也称紫微右垣七，又名BD+65 340，HD 20336、SAO 12704、HR 985，是鹿豹座的一颗恒星，视星等为4.84，位于銀經137.46，銀緯7.06，其B1900.0坐标为赤經3h 11m 11.1s，赤緯+65° 7.06′ 12″。
, HD 20336 (A Camelopardalis) é uma estrela … HD 20336 (A Camelopardalis) é uma estrela na direção da Camelopardalis. Possui uma ascensão reta de 03h 19m 59.26s e uma declinação de +65° 39′ 08.4″. Sua magnitude aparente é igual a 4.74. Considerando sua distância de 801 anos-luz em relação à Terra, sua magnitude absoluta é igual a −2.21. Pertence à classe espectral B2.5Vne.2.21. Pertence à classe espectral B2.5Vne.
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BK Camelopardalis is a variable star in th … BK Camelopardalis is a variable star in the northern circumpolar constellation of Camelopardalis, near the constellation border with Cassiopeia. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude that fluctuates around 4.74. The star is located approximately 540 light years away from the Sun based on parallax. It is a proposed member of the Cassiopeia–Taurus group of co-moving stars.assiopeia–Taurus group of co-moving stars.
, HD 20336 (A Camelopardalis) é uma estrela … HD 20336 (A Camelopardalis) é uma estrela na direção da Camelopardalis. Possui uma ascensão reta de 03h 19m 59.26s e uma declinação de +65° 39′ 08.4″. Sua magnitude aparente é igual a 4.74. Considerando sua distância de 801 anos-luz em relação à Terra, sua magnitude absoluta é igual a −2.21. Pertence à classe espectral B2.5Vne.2.21. Pertence à classe espectral B2.5Vne.
, BK Camelopardalis (BK Cam) es una estrella … BK Camelopardalis (BK Cam) es una estrella de magnitud aparente +4,73 encuadrada en la constelación boreal de Camelopardalis, la jirafa.Se encuentra a una distancia de 762 años luz, de acuerdo a la nueva reducción de los datos de paralaje del satélite Hipparcos (4,28 ± 0,48).aje del satélite Hipparcos (4,28 ± 0,48).
, 上丞(鹿豹座BK)也称紫微右垣七，又名BD+65 340，HD 20336、SAO 12704、HR 985，是鹿豹座的一颗恒星，视星等为4.84，位于銀經137.46，銀緯7.06，其B1900.0坐标为赤經3h 11m 11.1s，赤緯+65° 7.06′ 12″。
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BK Camelopardalis
, 上丞
, HD 20336
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