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HD 220889


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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

A catalog of precise reference star positions for the astrometry network of the international comet P/Halley compaign
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987A&AS...71..525D&db_key=AST

Micrometric Measures of Double Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974ApJS...28..413V&db_key=AST

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Observation and Astrometry data

Constellation:Pisces
Right ascension:23h27m20.94s
Declination:+04°27'00.1"
Apparent magnitude:8.729
Distance:57.339 parsecs
Proper motion RA:-16.6
Proper motion Dec:-100.9
B-T magnitude:9.398
V-T magnitude:8.785

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 220889
TYCHO-2 2000TYC 581-20-1
USNO-A2.0USNO-A2 0900-20409623
HIPHIP 115779
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