Speckle Observations With PISCO in Calern (France): III . Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB , STT77 AB , STF1338 AB , COU1746 , STT260 , A1109 AB , HU1291 , and A632 AB
Abstract
We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain. From our observations of 698 multiple stars, we obtained 679 new measurements with angular separations in the range 0″.1–7″.5, and an average accuracy of 0″.007. 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 the direct vector method, the restricted correlation technique, and/or by inspection of the long integration files. We present new and revised orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB, partly derived from our PISCO observations. The corresponding estimated values for the masses of those systems are compatible with the spectral types.
Related
- Astrometric planet search around southern ultracool dwarfs. V. Discovery of the exoplanet candidate PALTA-1 b
- Accurate dynamical mass and orbit determination of the M dwarf binary DG CVn using astrometric very long baseline interferometry
- Radial velocity follow-up of astrometric substellar companions: 6 confirmed brown dwarfs and 13 impostor binaries Gaia
- A pilot study on the CSST astrometric capability: Detecting astrometric binaries with Gaia synergy via simulated data
- Diffusion Models for Polarimetric Reconstruction of Circumstellar Environments in Correlated Speckle Noise
BibTeX
@article{prieur2026speckle,
title = {{Speckle Observations With PISCO in Calern (France): III . Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB , STT77 AB , STF1338 AB , COU1746 , STT260 , A1109 AB , HU1291 , and A632 AB}},
author = {J.‐l. Prieur and M. Scardia and J.‐p. Rivet and E. Aristidi and J F Ling and L. Piccotti and L. Pansecchi and R W Argyle and L. Abe and P. Bendjoya and L. Maccarini and D. Vernet},
journal = {Astronomical Notes / Astronomische Nachrichten},
year = {2026},
month = jul,
doi = {10.1002/asna.70115},
url = {https://hal.science/hal-05843860v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Speckle Observations With PISCO in Calern (France): III . Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB , STT77 AB , STF1338 AB , COU1746 , STT260 , A1109 AB , HU1291 , and A632 AB
AU - J.‐l. Prieur
AU - M. Scardia
AU - J.‐p. Rivet
AU - E. Aristidi
AU - J F Ling
AU - L. Piccotti
AU - L. Pansecchi
AU - R W Argyle
AU - L. Abe
AU - P. Bendjoya
AU - L. Maccarini
AU - D. Vernet
PY - 2026
DA - 2026/07/31
JO - Astronomical Notes / Astronomische Nachrichten
DO - 10.1002/asna.70115
UR - https://hal.science/hal-05843860v1
AB - We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain. From our observations of 698 multiple stars, we obtained 679 new measurements with angular separations in the range 0″.1–7″.5, and an average accuracy of 0″.007. 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 the direct vector method, the restricted correlation technique, and/or by inspection of the long integration files. We present new and revised orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB, partly derived from our PISCO observations. The corresponding estimated values for the masses of those systems are compatible with the spectral types.
SN - 0004-6337
SN - 1521-3994
ER -