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HD 207030


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The young eclipsing binary EK Cephei
New photoelectric (UBVR) observations of the young binary EK Cep areobtained. The orbital period is improved (P = 4.427 7954d). Newphotometric elements are determined by Lavrov's direct method. The ideathat the cool secondary star has color excesses is confirmed. Theresults of UBVR photometry of stars in the binary neighborhood aregiven. The system is not associated with any star group. The period ofthe periastron advance for the moderately eccentric orbits is calculated(4200 +/- 200 yr), and difficulties of the theoretical interpretation ofthis result are stated.

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观测天体数据

星座:仙王座
右阿森松:21h42m49.22s
赤纬:+69°03'13.2"
视星:7.546
距离:454.545 天文距离
右阿森松适当运动:9.1
赤纬适当运动:-8.3
B-T magnitude:9.598
V-T magnitude:7.716

目录:
适当名称   (Edit)
HD 1989HD 207030
TYCHO-2 2000TYC 4462-1804-1
USNO-A2.0USNO-A2 1575-04767549
HIPHIP 107205

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