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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: | Centauro |
| Ascensione retta: | 12h45m39.22s |
| Declinazione: | -37°49'14.7" |
| Magnitudine apparente: | 8.236 |
| Distanza: | 218.341 parsec |
| Moto proprio RA: | 5.5 |
| Moto proprio Dec: | 0.3 |
| B-T magnitude: | 9.882 |
| V-T magnitude: | 8.372 |
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