HD 230309

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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.

Mesures d'etoiles doubles effectuees AU refracteurs de 38 CM puis de 50 CM de l'Observatoire de Nice.
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Osservazione e dati astrometrici

Costellazione:	Aquila
Ascensione retta:	18^h59^m05.91^s
Declinazione:	+18Â°10'05.1"
Magnitudine apparente:	9.282
Moto proprio RA:	-20.1
Moto proprio Dec:	-29.6
B-T magnitude:	9.979
V-T magnitude:	9.34

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 230309
TYCHO-2 2000	TYC 1589-118-1
USNO-A2.0	USNO-A2 1050-12463793
HIP	HIP 93205

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