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HD 85253


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A large, complete, volume-limited sample of G-type dwarfs. I. Completion of Stroemgren UVBY photometry
Four-colour photometry of potential dwarf stars of types G0 to K2,selected from the Michigan Spectral Catalogues (Vol. 1-3), has beencarried out. The results are presented in a catalogue containing 4247uvby observations of 3900 stars, all south of δ = -26deg. Theoverall internal rms errors of one observation (transformed to thestandard system) of a program star in the interval 8.5 < V < 10.5are 0.0044, 0.0021, 0.0039, and 0.0059, respectively, in V, b-y, m_1_ ,and c_1_. The purpose of the catalogue, combined with earliercatalogues, is to allow selection of a large, complete, volume-limitedsample of G- and K-type dwarfs, investigate their metallicitydistribution, and compare it to predictions of various models ofgalactic chemical evolution. Future papers in this series will discussthese subjects.

CCD measurements of visual binaries
CCD measurements of visual double stars were obtained with the ESO 1.5 mdanish reflector. All binaries observed are candidates for the HIPPARCOSInput Catalogue. More than 400 observations have been made in four clearnights. The accuracy obtained is comparable to the accuracy of thephotographic technique, but the observing and reduction times are oneorder of magnitude smaller.

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Observation and Astrometry data

Constellation:Τρόπις
Right ascension:09h48m32.25s
Declination:-58°40'34.0"
Apparent magnitude:8.692
Distance:242.131 parsecs
Proper motion RA:11.6
Proper motion Dec:-12.7
B-T magnitude:10.16
V-T magnitude:8.814

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 85253
TYCHO-2 2000TYC 8610-1068-1
USNO-A2.0USNO-A2 0300-07986928
HIPHIP 48108

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