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TYC 1657-561-1

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Speckle Interferometry at the Observatorio Astronómico Nacional. III We present speckle interferometric measurements of binary starsperformed during August of 2010 with the 1.5 m telescope and duringNovember of 2010 with the 2.1 m telescope of the ObservatorioAstronómico Nacional at SPM (Mexico). We report here the resultsof 238 measurements of 225 pairs with a primary limiting magnitude of V= 12.2; 211 of them have separations less than 1''. The mean error inseparation is 0.03 arcsec 1.5° in position angle. Some of theposition angles were determined with the usual 180° ambiguity.
Mesures d'etoiles doubles faites aux lunettes de 74 et 50 CM de l'Observatoire de la Cote d'Azur We give 657 measurements of double stars, Table 1 by R. Gili with CCDcamera, Table 2 by P. Couteau with filar micrometer. Tables 1 and 2 areonly available in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html.
Étoiles doubles nouvelles (4^éme série) découvertes à Nice avec la lunette de 50 centimètres Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....1..105C&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Pegaso
Ascensione retta:	21^h09^m07.70^s
Declinazione:	+19Â°05'48.3"
Magnitudine apparente:	11.173
Moto proprio RA:	-10.5
Moto proprio Dec:	1.7
B-T magnitude:	11.953
V-T magnitude:	11.238

Cataloghi e designazioni:

Nomi esatti	(Edit)
TYCHO-2 2000	TYC 1657-561-1
USNO-A2.0	USNO-A2 1050-19250281
HIP	HIP 104416

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