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TYC 2189-1260-1

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Binary Star Orbits. II. Preliminary First Orbits for 117 Systems Orbital elements are presented for 117 binary systems with no previousorbit calculation. For nearly all of these systems, these elements mustbe regarded as preliminary, but the ephemerides presented here should berelatively accurate over the next several decades. Further, the analysisof these systems should highlight the need for their continuedobservation by dedicated programs to improve the veracity of theseelements.
Micrometer Measures of Double Stars Micrometer measures of 795 double stars made with the 26 inch (0.66 m)refractor of the US Naval Observatory from 1984 to 1990 are presented.
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.
Measurements of visual double stars made at PIC DU Midi and at Nice Fifty visual measures of 37 very close binaries observed with the 2-mtelescope at Pic du Midi are presented together with 601 measures of 245close binaries observed with the 74-cm and 50-cm refractors at Nice. Allmeasurements were made by micrometer with illuminated wires. With the2-m telescope, binaries as close as 0.07 arcsec are separated, usingmagnifying powers from 2500 to 5000.
Micrometric Measures of Double Stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974ApJS...28..413V&db_key=AST
Mesures d'étoiles doubles faites à Nice Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&AS....6..185C&db_key=AST
Mesures d'étoiles doubles visuelles Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....3...71M&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Pegaso
Ascensione retta:	21^h38^m17.79^s
Declinazione:	+23Â°35'54.6"
Magnitudine apparente:	9.304
Moto proprio RA:	17.5
Moto proprio Dec:	7.4
B-T magnitude:	9.685
V-T magnitude:	9.336

Cataloghi e designazioni:

Nomi esatti	(Edit)
TYCHO-2 2000	TYC 2189-1260-1
USNO-A2.0	USNO-A2 1125-18615476
HIP	HIP 106835

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