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HD 99811

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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.
Large and kinematically unbiased samples of G- and K-type stars. V - Evolved stars in the selected areas at + 15-deg declination Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1990PASP..102..242E&db_key=AST
Photoelectric radial velocities. IV. 528 7 to 10 mag stars in the +15degree selected areas. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971MNRAS.155....1G&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Leone
Ascensione retta:	11^h29^m01.39^s
Declinazione:	+15Â°55'20.7"
Magnitudine apparente:	8.785
Distanza:	65.359 parsec
Moto proprio RA:	-94.6
Moto proprio Dec:	-9.7
B-T magnitude:	9.794
V-T magnitude:	8.869

Cataloghi e designazioni:

Nomi esatti
HD 1989	HD 99811
TYCHO-2 2000	TYC 1438-2299-1
USNO-A2.0	USNO-A2 1050-06511252
HIP	HIP 56030

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