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HD 173133


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Toward selection of intermediate-magnitude polarization standards
The Minipol optical polarimeter with a V-band filter was used to observe16 summer intermediate-magnitude (mB = about 9) stars from the survey ofMathewson and Ford (1970). These stars were chosen to span polarizationpercentages from zero to almost 6 percent and to cover a large range ofpolarization position angles. The primary reason for reobserving thesestars was to determine their V-band polarization properties and toidentify polarization variables, which are unsuitable standards. TheMinipol observations showed that 12 of the stars had V-bandpolarizations that were very similar to the Mathewson and Ford B-bandvalues. One star had a significantly different polarization positionangle and two had significantly different percentage polarizations. Onestar, HD 161306, was wildly different in both percentage polarizationand position angle.

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Observation and Astrometry data

Constellation:ヘルクレス座
Right ascension:18h43m05.18s
Declination:+18°04'40.5"
Apparent magnitude:8.139
Distance:225.225 parsecs
Proper motion RA:-0.1
Proper motion Dec:-6.1
B-T magnitude:8.262
V-T magnitude:8.15

Catalogs and designations:
Proper Names
HD 1989HD 173133
TYCHO-2 2000TYC 1587-696-1
USNO-A2.0USNO-A2 1050-11407595
HIPHIP 91798

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