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HD 144391


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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.

UVBY observations of A, F, G and K field stars
Photoelectric data in the uvby system have been obtained for about 800southern stars of the Hipparcos Input Catalog (Grenon, 1982, 1985). Mostof the stars are F and G main sequence and fall in the magnitude range V= 8-11.

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Observation and Astrometry data

Constellation:Scorpius
Right ascension:16h06m01.21s
Declination:-08°46'14.1"
Apparent magnitude:7.937
Distance:167.785 parsecs
Proper motion RA:3
Proper motion Dec:-63
B-T magnitude:9.377
V-T magnitude:8.056

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 144391
TYCHO-2 2000TYC 5612-1223-1
USNO-A2.0USNO-A2 0750-09423727
HIPHIP 78874

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