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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 Observations of Double Stars - Part Two
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1984AJ.....89..876M&db_key=AST

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Dades d'Observació i Astrometria

Constel·lació:Cetus
Ascensió Recta:00h55m05.88s
Declinació:-17°26'34.3"
Magnitud Aparent:8.582
Distancia:158.479 parsecs
Moviment propi RA:18.7
Moviment propi Dec:-12.9
B-T magnitude:9.202
V-T magnitude:8.634

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 5339
TYCHO-2 2000TYC 5848-525-1
USNO-A2.0USNO-A2 0675-00354135
HIPHIP 4299

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