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HD 203484

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SIDONIE: A gateway for visual double stars studies A database on visual binaries is presented. It contains measurements on12750 visual binaries with less than 2'' of separation or with largeproper motion north of -10 degrees of declination. It contains alsobibliographic references and published orbits for 851 stars. The SIDONIEdatabase is implemented on the Web and allows astronomers to prepare newobservations, find data to calculate new orbits or obtain statisticalinformation on the stars in the database.
Mesures d'etoiles doubles effectuees a la lunette de 50 CM de l'Observatoire de Nice (2({) e. Measures of visual double stars made with the 50 CM refractor at the Nice Observatory (2^{nd 66 measures of 38 visual double stars made at the Observatoire de laCote d'Azur, at Nice, in september et december 1997, with the 50 cmequatorial refractor equipped with filar micrometer and electronicrecording device. Observation programmes of stars suspected double andnew binaries discovered by Hipparcos, and measures of double stars whichhave seldom or never been observed since the epoch of their discovery.
Mesures et decouvertes d'etoiles doubles effectuees a la lunette de 50cm de l'Observatoire de Nice. Measures and discoveries of visual double stars made with the 50cm refractor at the Nice Observatory. Measures and discoveries of visual double stars made at the Observatoirede la Cote d'Azur at Nice, between 1988 and 1994, with the 50cmrefractor equipped with a filar micrometer and electronic recordingdevice. The programs proposed by J. Dommanget involve the complement ofthe C.C.D.M. (resolving problems of identification of double stars andof coherency in the Index) and the INput CAtalog Hipparcos (resolutionof ambiguities on the binarity and on the position of certain doublestars which have seldom or never been observed again from the epoch ortheir discovery). The author has discovered three new binaries: JCT1,JCT2 and JCT3.

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Osservazione e dati astrometrici

Costellazione:	Pegaso
Ascensione retta:	21^h21^m57.90^s
Declinazione:	+23Â°49'30.7"
Magnitudine apparente:	8.83
Distanza:	378.788 parsec
Moto proprio RA:	6.6
Moto proprio Dec:	-5.8
B-T magnitude:	9.087
V-T magnitude:	8.852

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 203484
TYCHO-2 2000	TYC 2187-2180-1
USNO-A2.0	USNO-A2 1125-18271728
HIP	HIP 105489

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