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HD 23944

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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.
ICCD Speckle Observations of Binary Stars. XVI. Measurements During 1982-1989 from the Perkins 1.8-M Telescope. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1997AJ....114.1623F&db_key=AST
ICCD Speckle Observations of Binary Stars. XII. Measurements During 1984-1986 From the Perkins 1.8 M Telescope Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..393A&db_key=AST
Observations of double stars and new pairs. XV The study reports visual and photographic measures listed for 1150 pairsobtained in the time frame 1989.91-1992.15, including 221 new doublestars. Magnitudes were estimated for a part of the objects, especiallythe fainter ones. Plate orientations were calculated from field stars ofknown positions and were precessed to the epoch; numbers of nights andof measured exposures are given. Reobservation of faint, neglected pairsreveal many corrections to the data from the old discovery lists.
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
Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice Not Available

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Osservazione e dati astrometrici

Costellazione:	Giraffa
Ascensione retta:	03^h57^m27.76^s
Declinazione:	+77Â°24'53.4"
Magnitudine apparente:	8.221
Distanza:	273.973 parsec
Moto proprio RA:	-4.6
Moto proprio Dec:	-11.5
B-T magnitude:	9.101
V-T magnitude:	8.294

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 23944
TYCHO-2 2000	TYC 4513-2362-1
USNO-A2.0	USNO-A2 1650-00747198
HIP	HIP 18510

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