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HD 186783


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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.

UBV photometry of HD stars in the fields of selected cataclysmic variables.
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Observation and Astrometry data

Constellation:Sagittaire
Right ascension:19h48m24.90s
Declination:-42°40'31.9"
Apparent magnitude:9.902
Proper motion RA:-117.8
Proper motion Dec:41.4
B-T magnitude:11.014
V-T magnitude:9.994

Catalogs and designations:
Proper Names
HD 1989HD 186783
TYCHO-2 2000TYC 7941-1310-1
USNO-A2.0USNO-A2 0450-38168018
HIPHIP 97449
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