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HD 21684

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Spectral Classification of Stars in A Supplement to the Bright Star Catalogue MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.
Stars Brighter than V=6M5 not Listed in the HR Catalogue Not Available

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观测天体数据

星座:	英仙座
右阿森松:	03^h31^m30.29^s
赤纬:	+40Â°45'35.8"
视星:	6.498
距离:	133.69 天文距离
右阿森松适当运动:	24.1
赤纬适当运动:	-41
B-T magnitude:	6.776
V-T magnitude:	6.521

目录:

适当名称
HD 1989	HD 21684
TYCHO-2 2000	TYC 2866-771-1
USNO-A2.0	USNO-A2 1275-02391834
HIP	HIP 16425

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