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| Photometry of astrometric reference stars UBVRI, DDO, and uvby, H-beta photometry of astrometric reference starsis presented. Spectral types and luminosity classifications made fromthe colors are used to determine their spectroscopic parallaxes. In thispaper, colors for 309 stars in 25 regions are given, and classificationsfor 210 stars have been made. These stars form reference frames in theAllegheny Observatory Multichannel Astrometric Photometer astrometricprogram, and in the Praesepe cluster reduced by Russell (1976). It isfound that the present photometric spectral types are reliable to within2.5 spectral subclasses.
| 21-cm observations of nonplanar H I associated with the Perseus spiral arm Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1977AJ.....82..886G&db_key=AST
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Datos observacionales y astrométricos
Constelación: | Casiopea |
Ascensión Recta: | 00h31m15.44s |
Declinación: | +57°15'06.1" |
Magnitud Aparente: | 8.718 |
Distancia: | 934.579 parsecs |
Movimiento Propio en Ascensión Recta: | -0.3 |
Movimiento Propio en Declinación: | -1.9 |
B-T magnitude: | 8.925 |
V-T magnitude: | 8.736 |
Catálogos y designaciones:
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