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HD 190522


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Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

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观测天体数据

星座:天鷹座
右阿森松:20h05m20.34s
赤纬:+00°27'16.2"
视星:6.933
距离:6250 天文距离
右阿森松适当运动:4.5
赤纬适当运动:-8.9
B-T magnitude:6.972
V-T magnitude:6.937

目录:
适当名称
HD 1989HD 190522
TYCHO-2 2000TYC 494-2629-1
USNO-A2.0USNO-A2 0900-17645426
HIPHIP 98945

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