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HD 224766


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CCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue III. CCD photometry and differential astrometry for 253 southern ``intermediate'' systems
We present new astrometric and photometric data for 253 visual doublestars of the ``intermediate'' class, i.e. with angular separations inthe range 1 to 15 arcsec. The multi-colour observations were obtained in1992-94 as part of the ESO Key Programme ``Visual Double Stars''performed at La Silla Observatory (Chile). Differential magnitudes andcolours have been secured in a systematic way while component magnitudesand colour indices have been determined in the V and I passbands of theCousins standard system in good photometric conditions only. Internaland mean external errors are smaller than respectively 0.01 mag and afew hundreths of a magnitude (typically less than 0.03 mag). Relativepositions are obtained as a by-product with internal errors of the orderof 0.006 arcsec in angular separation (corresponding to pixel width x0.02) and 0.07 degr in position angle. Final accuracies are thoroughlydiscussed: we illustrate the overall excellent quality of the data andestimate the quality degradation for angular separations barely largerthan the width of the seeing disk. Based on observations made at LaSilla (ESO, Chile, Key Programme 7-009-49K).

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Osservazione e dati astrometrici

Costellazione:Tucano
Ascensione retta:00h00m32.16s
Declinazione:-72°12'09.8"
Magnitudine apparente:9.743
Moto proprio RA:-26.8
Moto proprio Dec:1.7
B-T magnitude:10.647
V-T magnitude:9.818

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 224766
TYCHO-2 2000TYC 9137-925-1
USNO-A2.0USNO-A2 0150-00002095
HIPHIP 45

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