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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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Observation and Astrometry data

Constellation:Pegasus
Right ascension:21h09m07.70s
Declination:+19°05'48.3"
Apparent magnitude:11.173
Proper motion RA:-10.5
Proper motion Dec:1.7
B-T magnitude:11.953
V-T magnitude:11.238

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 1657-561-1
USNO-A2.0USNO-A2 1050-19250281
HIPHIP 104416
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