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Radial velocity measurements. IV - Ground-based accompaniment to the HIPPARCOS observation program
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| The fourth meridian catalog of Besancon Observatory
The catalog presented gives differential meridian positions for 670F-type stars between plus 15 and plus 45 deg declination. The positionsare reduced to the equinox of 1950.0 without proper motions; 333 FK4stars were used as reference stars. A minimum of three and an average offive transits of each program star were observed photoelectrically usinga Gautier transit circle and a Hog grid. The internal accuracy ofindividual measurements is shown to range from 0.013 sec in rightascension and 0.30 arcsec in declination for brighter stars under betterobserving conditions to 0.020 sec in right ascension and 0.38 arcsec indeclination for fainter stars under worse conditions. The standarderrors were applied to compute weighted mean positions, mean epochs, andunweighted means for the program stars. Mean corrections for 283 FK4stars are also provided.
| Estimation of spectral classifications for bright northern stars with interesting Stromgren indices
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| Photométrie photoélectrique UBV d'étoiles chaudes des "Selected Areas" 40 et 49 situées AU voisinage DU plan galactique
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....1...15B&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Cigno |
| Ascensione retta: | 20h15m23.74s |
| Declinazione: | +44°00'02.3" |
| Magnitudine apparente: | 7.158 |
| Distanza: | 1063.83 parsec |
| Moto proprio RA: | 1.6 |
| Moto proprio Dec: | -4.7 |
| B-T magnitude: | 7.624 |
| V-T magnitude: | 7.197 |
Cataloghi e designazioni:
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