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HD 187979

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CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars Context: We measured the angular separations, position angles, ΔV, Δ y and Δ I of wide visual double stars during the period2003-2005. At least one component of the double stars in our sample hasan entry in the Hipparcos catalogue. Aims: Our measurements are acontribution to the study of the nature of these double stars. Methods: The northern double stars of the project were observed with the1.2 m telescope of the Kryonerion observatory and the southern with the1.0 m SAAO. We performed multiple-exposure CCD imaging of our targetsand used the standard procedure of data reduction and astrometric CCDcalibrations. Results: We present measurements of 213 northern and 219southern wide binaries.Based on observations made at Kryonerion Observatory of the NationalObservatory of Athens, Greece, and the South African AstronomicalObservatory. Full Table 1 and Tables 2, 3 are only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/472/1055
Mesures d'etoiles doubles faites a Nice (5eme serie. Double star measurements made at Nice We present the last observations from two lists: General program and MLRpairs, made with the 50~cm refractor of Nice Observatory.
A second list of wide visual binaries Not Available
A second list of wide visual binaries Not Available
Mesures d'étoiles doubles faites aux Observatoires Yerkes et McDonald Not Available

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Osservazione e dati astrometrici

Costellazione:	Cigno
Ascensione retta:	19^h50^m07.53^s
Declinazione:	+54Â°39'06.5"
Magnitudine apparente:	7.994
Distanza:	325.733 parsec
Moto proprio RA:	1
Moto proprio Dec:	1.8
B-T magnitude:	10.151
V-T magnitude:	8.173

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 187979
TYCHO-2 2000	TYC 3939-1659-1
USNO-A2.0	USNO-A2 1425-10019275
HIP	HIP 97587

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