Speckle observations with PISCO in Merate (Italy): XIII. Astrometric measurements of visual binaries in 2012, and new orbits for ADS 10786 BC, 12144, 1215, 16314 and 16539
Résumé
We present relative astrometric measurements of visual binaries, made in 2012 with the speckle camera
PISCO at the 102-cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our observing list
contains orbital couples as well as binaries whose motion is still uncertain. We obtained 355 new measurements
of 344 visual binary stars, with angular separations in the range 0 ′′ .14 — 6 ′′ .9, and an average accuracy of
0 ′′ .02. The mean error on the position angles is 0 ◦ .5. Most of the position angles were determined without
the usual 180 ◦ ambiguity with the application of triple-correlation techniques and/or by inspection of the
long integration files. We also present new revised orbits for ADS 10786 BC, 12144, 12515, 16314 and 16539,
partly derived from PISCO observations. The corresponding estimated values for the masses of those systems
are compatible with the spectral types.
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