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HD 172440


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SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.

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.

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Osservazione e dati astrometrici

Costellazione:Sagittario
Ascensione retta:18h41m24.19s
Declinazione:-27°57'27.9"
Magnitudine apparente:8.464
Distanza:473.934 parsec
Moto proprio RA:-4.1
Moto proprio Dec:-1.8
B-T magnitude:10.618
V-T magnitude:8.642

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 172440
TYCHO-2 2000TYC 6866-1869-1
USNO-A2.0USNO-A2 0600-36600598
HIPHIP 91650

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