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TYC 2026-172-1

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Speckle Interferometry at the Observatorio Astronómico Nacional. II We present speckle interferometric measurements of binary stars madeduring June of 2009 with the 1.5 m telescope of the ObservatorioAstronómico Nacional at SPM (Mexico). The data contain 189position angle and separation measures of 144 systems. The measuredangular separations range from 0arcsec.16 to 3arcsec.64. The maximummagnitude of the brighter component is 10.96. The mean error inseparation is 0arcsec.02 and in the position angles 1.5°. Some ofthe position angles were determined with the usual 180° ambiguity.
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 faites a Nice, etoiles doubles nouvelles (24eme serie) decouvertes a Nice. Table 1 gives 1182 measurements of 682 binaries observed with the 74 and50 cm refractors. Table 2 lists 26 new binaries discovered with the 50cm refractor.
Micrometer Observations of Double Stars and New Pairs - Part Ten Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ApJS...44..111H&db_key=AST
Micrometer measures of doubles stars. III. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963AJ.....68...57V&db_key=AST
Mesures d'étoiles doubles effectuées au réfracteur de 38 cm. de l'Observatoire de Nice Not Available

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Yilan
Sað Açýklýk:	15^h27^m05.97^s
Yükselim:	+23Â°54'55.3"
Görünürdeki Parlaklýk:	9.692
özdevim Sað Açýklýk:	-5.1
özdevim Yükselim:	-35.8
B-T magnitude:	10.326
V-T magnitude:	9.745

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
TYCHO-2 2000	TYC 2026-172-1
USNO-A2.0	USNO-A2 1125-07269825
HIP	HIP 75621

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