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HD 206775


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Speckle Interferometry of New and Problem Hipparcos Binaries. II. Observations Obtained in 1998-1999 from McDonald Observatory
The Hipparcos satellite made measurements of over 9734 known doublestars, 3406 new double stars, and 11,687 unresolved but possible doublestars. The high angular resolution afforded by speckle interferometrymakes it an efficient means to confirm these systems from the ground,which were first discovered from space. Because of its coverage of adifferent region of angular separation-magnitude difference(ρ-Δm) space, speckle interferometry also holds promise toascertain the duplicity of the unresolved Hipparcos ``problem'' stars.Presented are observations of 116 new Hipparcos double stars and 469Hipparcos ``problem stars,'' as well as 238 measures of other doublestars and 246 other high-quality nondetections. Included in these areobservations of double stars listed in the Tycho-2 Catalogue andpossible grid stars for the Space Interferometry Mission.

Identification par des numéros de catalogue ou par une position semi-précise d'étoiles doubles du Catalogue Index (1976. 5)
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Observation and Astrometry data

Constellation:Pégase
Right ascension:21h43m52.01s
Declination:+24°07'24.5"
Apparent magnitude:8.51
Distance:458.716 parsecs
Proper motion RA:-8.4
Proper motion Dec:-14
B-T magnitude:9.854
V-T magnitude:8.621

Catalogs and designations:
Proper Names
HD 1989HD 206775
TYCHO-2 2000TYC 2189-1741-1
USNO-A2.0USNO-A2 1125-18719344
HIPHIP 107284
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