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HD 220808


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Speckle Observations of Binary Stars with the WIYN Telescope. II. Relative Astrometry Measures during 1998-2000
Five hundred twelve relative astrometry measures are presented for 253double stars, including 53 double stars discovered by Hipparcos. In 15cases, relative astrometry is reported for the first time for newlyconfirmed pairs. In addition, 20 high-quality nondetections ofcompanions are reported for stars suspected of being nonsingle byHipparcos. Observations were taken using a fast-readout CCD camerasystem at the WIYN 3.5 m telescope at Kitt Peak, Arizona. In comparingthese measures with ephemeris predictions for binary stars with verywell known orbits, we find that the measurement precision is better than3 mas in separation and 1° in position angle per individualobservation. Measurement precision and detection capabilities are fullydiscussed, and confirmed orbital motion is reported in four cases of theHipparcos double star discoveries. The WIYN Observatory is a jointfacility of the University of Wisconsin-Madison, Indiana University,Yale University, and the National Optical Astronomy Observatory.

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Observation and Astrometry data

Constellation:Pegasus
Right ascension:23h26m38.32s
Declination:+29°02'19.6"
Apparent magnitude:8.702
Distance:71.023 parsecs
Proper motion RA:138
Proper motion Dec:-0.1
B-T magnitude:9.518
V-T magnitude:8.77

Catalogs and designations:
Proper Names
HD 1989HD 220808
TYCHO-2 2000TYC 2256-853-1
USNO-A2.0USNO-A2 1125-19810327
HIPHIP 115716

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