HD 323631

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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.

Erratum - Errors or Omissions in Star-Identifications in the General Catalogue of Trigonometric Stellar Parallaxes
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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Akrep
Sað Açýklýk:	17^h31^m35.47^s
Yükselim:	-40Â°36'13.1"
Görünürdeki Parlaklýk:	10.157
özdevim Sað Açýklýk:	137
özdevim Yükselim:	-91.4
B-T magnitude:	11.373
V-T magnitude:	10.258

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 323631
TYCHO-2 2000	TYC 7888-1250-1
USNO-A2.0	USNO-A2 0450-28370370
HIP	HIP 85774

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