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HD 18433


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A second list of wide visual binaries
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Common proper motion stars in the AGK 3
A search was made of common-proper-motion (CPM) systems among AGK 3stars. The selection of physical systems was based upon the ratiobetween the angular separation (rho) and the proper motion (mu); the CPMstars found are presented in two tables. Table I lists systems withrho/mu less than 1000 years. It contains 326 entries, and the proportionof optical pairs is estimated to be 1 percent. Table II lists systemswith rho/mu in the range 1000 to 3500 years; it contains 113 systems,but only 60 percent of them are physical. Nevertheless, these systemsoften have separations larger than 10,000 AU and are the mostinteresting for the study of the tail of the distribution function ofthe semimajor axes.

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Osservazione e dati astrometrici

Costellazione:Balena
Ascensione retta:02h57m51.84s
Declinazione:+00°24'47.8"
Magnitudine apparente:8.881
Moto proprio RA:72.1
Moto proprio Dec:25.6
B-T magnitude:9.644
V-T magnitude:8.944

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 18433
TYCHO-2 2000TYC 48-1699-1
USNO-A2.0USNO-A2 0900-00689186

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