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HD 284421


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The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.

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观测天体数据

星座:金牛座
右阿森松:04h25m27.03s
赤纬:+23°44'18.0"
视星:10.645
右阿森松适当运动:28.7
赤纬适当运动:16
B-T magnitude:11.509
V-T magnitude:10.717

目录:
适当名称   (Edit)
HD 1989HD 284421
TYCHO-2 2000TYC 1816-873-1
USNO-A2.0USNO-A2 1125-01625167
HIPHIP 20644

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