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HD 194916


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Speckle observations of binary systems measured by Hipparcos
From speckle observations made with the PISCO speckle camera at the Picdu Midi Observatory, we present high angular resolution astrometric datafor 43 binary stars already observed by the Hipparcos satellite. Thissample consists of mainly new Hipparcos eclipsing binaries with a visualcompanion closer than one arcsecond, chosen with the aim to study thedynamical implications of a third component on the observationalparameters of the eclipsing system. In addition, we also included aselection of close visual binaries with few speckle data in order toanalyse possible systematic departures between the speckle and thenon-speckle orbits. The reduction method and the results are presentedin detail. For the close visual binaries we confront our observationswith the ephemerides based on the best known orbits. For the wide visualbinaries the confrontation is made directly with the Hipparcos data. Ourobservations are consistent both with previous speckle data and withmost of the Hipparcos measurements. Based on observations made with theTélescope Bernard Lyot at the Pic du Midi Observatory, France andon data obtained by the Hipparcos astrometry satellite. This work hasalso made use of the Simbad database, operated at CDS, Strasbourg,France.

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Observation and Astrometry data

Constellation:Steinbock
Right ascension:20h28m26.61s
Declination:-09°22'13.4"
Apparent magnitude:6.837
Distance:163.666 parsecs
Proper motion RA:22.1
Proper motion Dec:7
B-T magnitude:8.338
V-T magnitude:6.961

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 194916
TYCHO-2 2000TYC 5754-409-1
USNO-A2.0USNO-A2 0750-20106966
HIPHIP 100982

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