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HD 106083


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UBV (RI)c standard stars in the E- and F-regions and in the Magellanic Clouds - a revised catalogue.
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UBV photometry of E region standard stars of intermediate brightness
Photometry data are given for 335 stars in the nine E regions.Observations were made using a photometer and filters on the 47 cmreflector at Cape Town. The stellar dispersions are summarized. Data arepresented in tabular form.

Atmospheric extinction in the /U-B/ color index
Various methods for obtaining the atmospheric extinction in the (U-B)color index taking into account the dependence of extinction coefficienton the intrinsic color index of the star are examined. Numericalintegrations are performed to determine synthetic color indices for 32stars of spectral classes O9 to M0 and luminosity classes I, III and Vthrough 0, 1 and 2 air masses, resulting in three (u-b) color indicesfor each star. Photometric reduction of the color indices to the (U-B)color index was then performed by the classical method, by the methodproposed by Gutierrez-Moreno et al. (1966) and various modifications ofit, and by the method proposed by Moffat and Vogt (1977). Comparisonwith observations of 71 stars in the standard region E5, nine extinctionstandard stars and 25 Johnson standard stars in the UBV reveals that thereduction of (U-B) by the classical method gives internal errors betweentwo and three times larger than those obtained for (B-V) and V, whilethe methods of Gutierrez-Moreno et al. and Moffat and Vogt providegreatly improved accuracy.

Photometric standard stars for the UBV and (RI)KC systems.
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Fainter Standards for VRI Photometry in the E Regions
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Standard magnitudes in the E regions.
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Observation and Astrometry data

Constellation:Zentaur
Right ascension:12h12m27.23s
Declination:-43°59'57.8"
Apparent magnitude:7.911
Distance:657.895 parsecs
Proper motion RA:-25.2
Proper motion Dec:4.5
B-T magnitude:9.412
V-T magnitude:8.035

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 106083
TYCHO-2 2000TYC 7768-1778-1
USNO-A2.0USNO-A2 0450-13965782
HIPHIP 59529
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