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HD 133409


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Intermediate-Brightness Equatorial Spectrophotometric Standards
We have obtained spectral energy distributions for 41 7m 8m stars nearthe celestial equator (δ=±3°). The λλ31007600 Å spectral range is studied with a spectral resolution of 50Å. The relative rms error in the visible is 1 2%, increasing to 35% towards the edges of the wavelength interval studied. All stars arereferenced to a single standard, the circumpolar star HD 221525. Thesynthetic colors of common stars are compared with those observed infour photometric systems: U BV, W BV R, uvby, and that of the TYCHOcatalog. The program stars are recommended as secondaryspectrophotometric standards.

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Observation and Astrometry data

Constellation:Libra
Right ascension:15h04m24.50s
Declination:-00°54'19.9"
Apparent magnitude:8.202
Distance:140.845 parsecs
Proper motion RA:14.4
Proper motion Dec:-3.8
B-T magnitude:8.458
V-T magnitude:8.224

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 133409
TYCHO-2 2000TYC 5000-472-1
USNO-A2.0USNO-A2 0825-08569231
HIPHIP 73741

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