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HD 324639


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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.

Walraven photometry of nearby southern OB associations
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Observation and Astrometry data

Constellation:さそり座
Right ascension:17h58m16.57s
Declination:-41°23'18.7"
Apparent magnitude:10.129
Proper motion RA:3.3
Proper motion Dec:-0.7
B-T magnitude:10.456
V-T magnitude:10.156

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 324639
TYCHO-2 2000TYC 7894-1977-1
USNO-A2.0USNO-A2 0450-31674899
HIPHIP 87977

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