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HD 326748


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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.

Determination of proper motions in the region of the association Scorpius OB1
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Observation and Astrometry data

Constellation:Scorpius
Right ascension:17h03m35.62s
Declination:-40°39'40.2"
Apparent magnitude:10.189
Proper motion RA:-35
Proper motion Dec:-104.8
B-T magnitude:11.072
V-T magnitude:10.262

Catalogs and designations:
Proper Names
HD 1989HD 326748
TYCHO-2 2000TYC 7873-1181-1
USNO-A2.0USNO-A2 0450-26347562
HIPHIP 83471
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