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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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Observation and Astrometry data
| Constellation: | みずがめ座 |
| Right ascension: | 21h11m36.49s |
| Declination: | -03°07'12.8" |
| Apparent magnitude: | 7.523 |
| Distance: | 281.69 parsecs |
| Proper motion RA: | 37.9 |
| Proper motion Dec: | -11.8 |
| B-T magnitude: | 8.921 |
| V-T magnitude: | 7.639 |
Catalogs and designations:
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INHABITED SKY
