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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.
| New proper motions for some AGK3 stars
In a program conducted to isolate AGK3 stars with large proper motions,it has been found that more than one hundred stars seem to be affectedby large errors in their published proper motions. For some of thoseobjects south of +25 deg, new proper motions are being obtained using,as first-epoch positions, the published material of the AstrographicCatalog. Second-epoch positions are derived from new plates taken withthe Yale Southern Observatory double astrograph.
| AGK3 Stars with Spuriously Large Proper Motions
Not Available
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משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | הרקולס |
| התרוממות ימנית: | 18h43m17.11s |
| סירוב: | +20°59'00.2" |
| גודל גלוי: | 10.409 |
| תנועה נכונה: | 2.9 |
| תנועה נכונה: | -2 |
| B-T magnitude: | 11.933 |
| V-T magnitude: | 10.535 |
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