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HD 18984


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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.

Mesures d'etoiles doubles faites aux lunettes de 74 et 50 CM de l'Observatoire de la Cote d'Azur
We give 657 measurements of double stars, Table 1 by R. Gili with CCDcamera, Table 2 by P. Couteau with filar micrometer. Tables 1 and 2 areonly available in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html.

Micrometer Measurements of Visual Double Stars Obtained at the Nice and Pic-Du Observatories
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987A&AS...71..115L&db_key=AST

Mesures d'etoiles doubles faites a Nice.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978A&AS...33..275M&db_key=AST

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Osservazione e dati astrometrici

Costellazione:Ariete
Ascensione retta:03h03m59.69s
Declinazione:+28°30'32.8"
Magnitudine apparente:8.226
Distanza:295.858 parsec
Moto proprio RA:14.8
Moto proprio Dec:-9.8
B-T magnitude:8.44
V-T magnitude:8.244

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 18984
TYCHO-2 2000TYC 1794-866-1
USNO-A2.0USNO-A2 1125-00985861
HIPHIP 14270
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