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HD 204747

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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
ICCD Speckle Observations of Binary Stars. XIII. Measurements During 1989- 1994 From the Cerro Tololo 4 M Telescope Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..936H&db_key=AST
7th list of new Southern double stars found at the Lamont-Hussey Observatory of the University of Michigan at Bloemfontein, South Africa. Not Available

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Osservazione e dati astrometrici

Costellazione:	Gru
Ascensione retta:	21^h32^m15.81^s
Declinazione:	-48Â°51'13.0"
Magnitudine apparente:	8.273
Distanza:	156.74 parsec
Moto proprio RA:	46.6
Moto proprio Dec:	-45
B-T magnitude:	8.566
V-T magnitude:	8.298

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 204747
TYCHO-2 2000	TYC 8431-188-1
USNO-A2.0	USNO-A2 0375-39489349
HIP	HIP 106345

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