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HD 20098

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Speckle Interferometry at the US Naval Observatory. VIII. The results of 2044 speckle interferometric observations of doublestars, made with the 26 inch (66 cm) refractor of the US NavalObservatory, are presented. Each speckle interferometric observation ofa system represents a combination of over a thousand short-exposureimages. These observations are averaged into 1399 mean positions andrange in separation from 0.16" to 14.97", with a mean separation of2.51". This is the eighth in a series of papers presenting measuresobtained with this system and covers the period 2001 March 18 through2001 December 30.
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.
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
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
Mesures d'étoiles doubles faites au rĝfraceur de 38 cm de l'Observatoire de Nice Not Available

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Osservazione e dati astrometrici

Costellazione:	Perseo
Ascensione retta:	03^h15^m00.27^s
Declinazione:	+35Â°43'26.3"
Magnitudine apparente:	9.506
Moto proprio RA:	-4.7
Moto proprio Dec:	-2.4
B-T magnitude:	9.563
V-T magnitude:	9.511

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 20098
TYCHO-2 2000	TYC 2352-1052-1
USNO-A2.0	USNO-A2 1200-01460653
HIP	HIP 15124

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