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HD 239937


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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 Wide-Angle Astrometric Standard in the Moscow Zenith Zone
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Visual double stars measured at Lick Observatory Mount Hamilton, California.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1979PASP...91..479H&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

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Membro dei seguenti gruppi:

Osservazione e dati astrometrici

Costellazione:Cefeo
Ascensione retta:22h22m11.05s
Declinazione:+59°59'05.3"
Magnitudine apparente:9.887
Moto proprio RA:20.6
Moto proprio Dec:11.7
B-T magnitude:10.38
V-T magnitude:9.928

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 239937
TYCHO-2 2000TYC 3994-693-1
USNO-A2.0USNO-A2 1425-13282414
HIPHIP 110438
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