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HD 84998


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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.

Observations of Double Stars. XVIII.
Micrometer observations of 1350 pairs in 1995-1997 are listed.

Micrometer Observations of Double Stars and New Pairs - Part Ten
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ApJS...44..111H&db_key=AST

Micrometer observations of double stars.8.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975ApJS...29..315H&db_key=AST

Mikrometermessungen von Doppelsternen. VII
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....1..393H&db_key=AST

Mesures d'étoiles doubles faites au 0,38 m de l'Observatoire de Paris.
Not Available

Mikrometermessungen von Doppelsternen. III
Not Available

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Observation and Astrometry data

Constellation:Ursa Major
Right ascension:09h51m15.22s
Declination:+60°37'00.1"
Apparent magnitude:8.851
Distance:163.132 parsecs
Proper motion RA:-18.3
Proper motion Dec:8.1
B-T magnitude:9.805
V-T magnitude:8.93

Catalogs and designations:
Proper Names
HD 1989HD 84998
TYCHO-2 2000TYC 4136-1412-1
USNO-A2.0USNO-A2 1500-05236113
HIPHIP 48343
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