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HD 158509


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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:へびつかい座
Right ascension:17h29m37.02s
Declination:+01°33'18.9"
Apparent magnitude:8.125
Distance:431.034 parsecs
Proper motion RA:-3.1
Proper motion Dec:-10.3
B-T magnitude:8.209
V-T magnitude:8.132

Catalogs and designations:
Proper Names
HD 1989HD 158509
TYCHO-2 2000TYC 401-1264-1
USNO-A2.0USNO-A2 0900-09888539
HIPHIP 85606

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