Open AccessSpeckle observations with PISCO in Merate – VII. Astrometric measurements of visual binaries in 2007
Author(s) -
Prieur J.L.,
Scardia M.,
Pansecchi L.,
Argyle R. W.,
Sala M.
Publication year - 2009
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2009.14576.x
Subject(s) - physics , speckle pattern , speckle imaging , astrometry , observatory , coronagraph , telescope , position angle , astronomy , orbit (dynamics) , astrophysics , stars , interferometry , position (finance) , optics , exoplanet , galaxy , engineering , aerospace engineering , finance , economics
We present relative astrometric measurements of visual binaries made during the first semester of 2007, with the Pupil Interferometry Speckle camera and COronagraph (PISCO) at the 102‐cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. We obtained 226 new measurements of 214 objects, with angular separations in the range 0.15–4.5 arcsec, and an average accuracy of 0.013 arcsec. The mean error on the position angles is . Most of the position angles could be 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 the new orbits we have computed for ADS 7871, 7982 and 8128, for which our measurements lead to large residuals and/or for which the revision is justified by the significant number of observations made since the publication of the previous orbit.