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Hipparcos astrometry for 257 stars using Tycho-2 data
We present improved Hipparcos astrometry for 257 Hipparcos stars,resolved into 342 components. For 64 of the stars no astrometry wasobtained in the Hipparcos Catalogue, while for the remaining starsadditional components have been added by this solution or the positionshave been revised considerably. We have used the published Hipparcostransit data for the new solutions, together with results from thesecond reduction of the Tycho data for defining better initial values.Based on observations made with the ESA Hipparcos astrometry satellite.Table 3 is only available in electronic form at the CDS via anonymousftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Stellar Spectra and Colors in a Clear Region in Cygnus.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1949ApJ...110..478N&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Cigno |
| Ascensione retta: | 20h01m01.42s |
| Declinazione: | +37°41'56.5" |
| Magnitudine apparente: | 9.703 |
| Moto proprio RA: | -4.2 |
| Moto proprio Dec: | -7 |
| B-T magnitude: | 9.634 |
| V-T magnitude: | 9.698 |
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