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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.
| Interstellar reddening in the direction of the globular cluster M71
Interstellar reddening as a function of distance in the direction of theglobular cluster M71 is determined by two-dimensional quantification of96 arcmin foreground stars observed in the Vilnius photometric system.In concentric areas with the radii 30 arcmin and 10 arcmin centered onthe cluster, the reddening shows the same variations, ranging fromE(B-V) = 0.12 to 0.32. The cluster stars are likely to have variableextinction too, at least in the outer regions of the cluster.
| Catalog of Luminous Stars in the Southern Coalsack Zone
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1982RMxAA...5..183M&db_key=AST
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Freccia |
| Ascensione retta: | 19h54m47.66s |
| Declinazione: | +18°32'06.3" |
| Magnitudine apparente: | 9.509 |
| Moto proprio RA: | -3.1 |
| Moto proprio Dec: | -3.5 |
| B-T magnitude: | 9.577 |
| V-T magnitude: | 9.515 |
Cataloghi e designazioni:
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