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HD 170991


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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.

The Distribution of the BD M-Type Stars Along the Galactic Equator.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1958ApJ...128..510N&db_key=AST

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Observation and Astrometry data

Constellation:Sagittarius
Right ascension:18h33m02.02s
Declination:-16°33'36.7"
Apparent magnitude:6.976
Distance:460.829 parsecs
Proper motion RA:1.2
Proper motion Dec:0.3
B-T magnitude:8.809
V-T magnitude:7.128

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 170991
TYCHO-2 2000TYC 6267-762-1
USNO-A2.0USNO-A2 0675-26991275
HIPHIP 90939
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