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HD 239355

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Diffraction-limited speckle masking interferometry of binary stars with the SAO 6-m telescope. Not Available
Binary star speckle measurements during 1989-1993 from the SAO 6 M and 1 M telescopes in Zelenchuk We have continued to survey visual and interferometric binary stars withsignificant orbital motion by means of speckle method at the telescopesof the Special Astrophysical Observatory (SAO) in Zelenchuk. Here wepresent the lists of 267 speckle observations made with the 6 m and the1 m telescopes in the period May 1989-November 1993.
Interferometric observations of double stars in 1986-1990 A tabulation is presented for the measurements of double stars that havebeen conducted with the photometric phase-grating interferometer of theMt. Sanglok 1-m reflector. The tabulation encompasses the observationepoch, the position angle, the separation in arcsec, the magnitudedifference, formal errors in P.A. and separation, SAO number, andcoordinates for 2000.0.
Catalogue of proper motions in the declination of stars of the Moscow zenith zone. Not Available
Interferometric Observations of Double Stars in 1985 and 1986 Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1988A&AS...72..563T&db_key=AST
UBV Photometry of Stars whose Positions are Accurately Known Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1984A&AS...57..357O&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Cigno
Ascensione retta:	20^h14^m00.65^s
Declinazione:	+55Â°57'11.3"
Magnitudine apparente:	8.819
Distanza:	265.252 parsec
Moto proprio RA:	17.3
Moto proprio Dec:	17
B-T magnitude:	9.226
V-T magnitude:	8.853

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 239355
TYCHO-2 2000	TYC 3941-919-1
USNO-A2.0	USNO-A2 1425-10438502
HIP	HIP 99715

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