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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.
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Osservazione e dati astrometrici
| Costellazione: | Sagittario |
| Ascensione retta: | 17h43m56.51s |
| Declinazione: | -22°45'42.9" |
| Magnitudine apparente: | 8.661 |
| Distanza: | 327.869 parsec |
| Moto proprio RA: | 8.6 |
| Moto proprio Dec: | 0.2 |
| B-T magnitude: | 10.239 |
| V-T magnitude: | 8.792 |
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