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HD 70531


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The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.

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Observation and Astrometry data

Constellation:Puppis
Right ascension:08h20m50.33s
Declination:-41°04'15.5"
Apparent magnitude:7.719
Distance:108.578 parsecs
Proper motion RA:2.1
Proper motion Dec:-13
B-T magnitude:8.013
V-T magnitude:7.744

Catalogs and designations:
Proper Names
HD 1989HD 70531
TYCHO-2 2000TYC 7665-983-1
USNO-A2.0USNO-A2 0450-06586539
HIPHIP 40906
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