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HD 20252

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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.
ICCD Speckle Observations of Binary Stars. XIII. Measurements During 1989- 1994 From the Cerro Tololo 4 M Telescope Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..936H&db_key=AST
ICCD speckle observations of binary stars. VIII - Measurements during 1989-1991 from the Cerro Tololo 4 M telescope One-thousand eighty-eight observations of 947 binary star systems,observed by means of speckle interferometry with the 4 m telescope onCerro Tololo, are presented. These measurements, made during the period1989-1991, comprise the second installment of results stemming from theexpansion of our speckle program to the southern hemisphere.
Measures of Southern Double Stars in 1981 Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1982A&AS...50..115W&db_key=AST
Visual double stars measured at Las Campanas Observatory, Chile. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1977PASP...89..582H&db_key=AST
Measures of southern visual double stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976PASP...88...52H&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Orologio
Ascensione retta:	03^h13^m35.03^s
Declinazione:	-47Â°11'36.5"
Magnitudine apparente:	8.514
Distanza:	161.551 parsec
Moto proprio RA:	62.7
Moto proprio Dec:	43.4
B-T magnitude:	9.111
V-T magnitude:	8.564

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 20252
TYCHO-2 2000	TYC 8058-174-1
USNO-A2.0	USNO-A2 0375-01039497
HIP	HIP 15018

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