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HD 201998


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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.

A. de Sitter's photographic polar photometry revisited; some remarks on photographic photometry with objective gratings
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Photographic magnitudes of stars brighter than 7m.75 between +75° and +80° declination (Errata: 11 270)
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Yerkes actinometry. Zone +73deg to +90deg.
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Datos observacionales y astrométricos

Constelación:Cefeo
Ascensión Recta:21h03m36.09s
Declinación:+81°09'39.3"
Magnitud Aparente:6.954
Distancia:238.095 parsecs
Movimiento Propio en Ascensión Recta:21.4
Movimiento Propio en Declinación:30.7
B-T magnitude:7.256
V-T magnitude:6.979

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 201998
TYCHO-2 2000TYC 4598-1101-1
USNO-A2.0USNO-A2 1650-02354646
HIPHIP 103938
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