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HD 31661


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Positional reference stars in the Magellanic Clouds
The equatorial coordinates are determined of 926 stars (mainly ofgalactic origin) in the direction of the Magellanic Clouds at the meanepoch T = 1978.4 with an overall accuracy characterized by the meanvalues of the O-C coordinates, Sa = 0.35 arcsec and Sd = 0.38 arcsec,calculated from the coordinates of the Perth reference stars. Thesevalues are larger than the accuracy expected for primary standard stars.They allow the new positions to be considered as those of reliablesecondary standard stars. The published positions correspond to anunquestionable improvement of the quality of the coordinates provided inthe current catalogs. This study represents an 'astrometric step' in thestarting of a 'Durchmusterung' of the Magellanic Clouds organized by deBoer (1988, 1989).

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Observation and Astrometry data

Constellation:Mensa
Right ascension:04h50m49.03s
Declination:-72°25'27.1"
Apparent magnitude:9.321
Proper motion RA:14.1
Proper motion Dec:18.5
B-T magnitude:10.01
V-T magnitude:9.378

Catalogs and designations:
Proper Names
HD 1989HD 31661
TYCHO-2 2000TYC 9169-451-1
USNO-A2.0USNO-A2 0150-02185108
HIPHIP 22525

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