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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
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Observation and Astrometry data

Constellation:ペルセウス座
Right ascension:03h31m30.29s
Declination:+40°45'35.8"
Apparent magnitude:6.498
Distance:133.69 parsecs
Proper motion RA:24.1
Proper motion Dec:-41
B-T magnitude:6.776
V-T magnitude:6.521

Catalogs and designations:
Proper Names
HD 1989HD 21684
TYCHO-2 2000TYC 2866-771-1
USNO-A2.0USNO-A2 1275-02391834
HIPHIP 16425
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