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HD 100822


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Micrometer Measures of Double Stars
Micrometer measures of 795 double stars made with the 26 inch (0.66 m)refractor of the US Naval Observatory from 1984 to 1990 are presented.

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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Observation and Astrometry data

Constellation:しし座
Right ascension:11h36m14.61s
Declination:+03°18'04.0"
Apparent magnitude:7.196
Distance:215.517 parsecs
Proper motion RA:-32.2
Proper motion Dec:-39.7
B-T magnitude:8.381
V-T magnitude:7.294

Catalogs and designations:
Proper Names
HD 1989HD 100822
TYCHO-2 2000TYC 274-1048-1
USNO-A2.0USNO-A2 0900-06964625
HIPHIP 56598

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