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HD 168618


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CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars
Context: We measured the angular separations, position angles, ΔV, Δ y and Δ I of wide visual double stars during the period2003-2005. At least one component of the double stars in our sample hasan entry in the Hipparcos catalogue. Aims: Our measurements are acontribution to the study of the nature of these double stars. Methods: The northern double stars of the project were observed with the1.2 m telescope of the Kryonerion observatory and the southern with the1.0 m SAAO. We performed multiple-exposure CCD imaging of our targetsand used the standard procedure of data reduction and astrometric CCDcalibrations. Results: We present measurements of 213 northern and 219southern wide binaries.Based on observations made at Kryonerion Observatory of the NationalObservatory of Athens, Greece, and the South African AstronomicalObservatory. Full Table 1 and Tables 2, 3 are only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/472/1055

Mesures d'etoiles doubles faites a Nice (5eme serie. Double star measurements made at Nice
We present the last observations from two lists: General program and MLRpairs, made with the 50~cm refractor of Nice Observatory.

A second list of wide visual binaries
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A second list of wide visual binaries
Not Available

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Dades d'Observació i Astrometria

Constel·lació:Draco
Ascensió Recta:18h16m14.49s
Declinació:+64°04'17.7"
Magnitud Aparent:8.218
Distancia:234.742 parsecs
Moviment propi RA:-0.4
Moviment propi Dec:24.6
B-T magnitude:8.35
V-T magnitude:8.229

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 168618
TYCHO-2 2000TYC 4209-1962-1
USNO-A2.0USNO-A2 1500-06466627
HIPHIP 89541

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