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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.
| Parallaxes and proper motions of 25 stars from plates taken with the 61-cm Sproul refractor
Results from twenty-five parallaxes and relative proper motions from 22Sproul plate series are discussed. The program stars are spectral type For later and main-sequence objects except for one which is shown to be agiant. Three are spectroscopic binaries, two are BY Dra stars. Firsttrigonometric parallaxes are presented for five stars.
| Helligkeiten und Eigenbewegungen in den Hyaden. Mit 6 Textabbildungen
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | שור |
| התרוממות ימנית: | 04h25m30.75s |
| סירוב: | +15°32'30.4" |
| גודל גלוי: | 9.476 |
| תנועה נכונה: | 27.2 |
| תנועה נכונה: | -4.2 |
| B-T magnitude: | 11.435 |
| V-T magnitude: | 9.638 |
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