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HD 172507


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Inaccuracies in the spectral classification of stars from the Tycho-2 Spectral Type Catalogue
We compare the spectroscopic and trigonometric parallaxes of commonstars from the Tycho-2 Spectral Type and Hipparcos Catalogues. Thiscomparison has revealed that the distance estimations for theoverwhelming majority of stars by both methods yield very similarresults. However, there is a small fraction of stars for which thedistance estimates differ significantly. It is these stars that are thesubject of our study. We have been able to find the causes of thesedifferences.

Dwarf K and M stars in the southern hemisphere.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972AJ.....77..486U&db_key=AST

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Observation and Astrometry data

Constellation:Serpens
Right ascension:18h40m42.05s
Declination:-02°41'46.1"
Apparent magnitude:9.956
Proper motion RA:32.2
Proper motion Dec:-15.4
B-T magnitude:10.997
V-T magnitude:10.042

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 172507
TYCHO-2 2000TYC 5117-1196-1
USNO-A2.0USNO-A2 0825-12586627
HIPHIP 91587

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