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The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Observations of double stars and new pairs. XIV
Results of a continuing survey of visual double stars are presented,including 4880 measurements made from February 1987 to November 1989.The positions in WDS format and Durchmusterung numbers are given for 194pairs first reported here. Micrometer measurements of 1142 doubles madewith the Swarthmore 61 cm refractor are presented. Magnitudes areestimated for some of the objects. Plate measurements, plateorientations, position angles, number of nights, and measured exposuresare given. Visual observations of 342 pairs obtained in May 1989 atCerro Tololo, mostly with the 1.0 m reflector, are reported.
| Sixty-six newly-identified double stars
Precise positions are given for 66 stars of previously doubtfulexistence, unclear identity, or uncertain position. Cross identificationof all pairs with existing astrometric star catalogues has beenattempted. Cross identifications and AGK3 data are given for 12 objectswhich coincided with AGK3 stars. The mean error of the absolutepositions for well-defined star images is about 0.5 arcsec, while thatof the relative positions within wide pairs is about 0.4 arcsec.
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Pozíciós és asztrometriai adatok
| Csillagkép: | Vízöntő |
| Rektaszcenzió: | 19h39m10.28s |
| Deklináció: | +11°51'23.1" |
| Vizuális fényesség: | 9.539 |
| RA sajátmozgás: | -2.9 |
| Dec sajátmozgás: | -9.3 |
| B-T magnitude: | 11.113 |
| V-T magnitude: | 9.669 |
Katalógusok és elnevezések:
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