Speckle Interferometry at SOAR in 2024 and 2025

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Authors

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Publication Details

Journal
The Astronomical Journal
Published
2026-06-03
DOI
https://doi.org/10.3847/1538-3881/ae6cf5
Citations
242
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Speckle Interferometry at SOAR in 2024 and 2025

Andreï Tokovinin, William I. Hartkopf, Brian D. Mason
242 citations
The Astronomical Journal
Stellar, planetary, and galactic studies
article

Speckle Interferometry at SOAR in 2024 and 2025

Andreï Tokovinin, William I. Hartkopf, Brian D. Mason
article en
242 citations

Abstract

Abstract Results of speckle interferometry observations at the 4.1 m Southern Astrophysical Research telescope obtained during 2024–2025 are presented. We present 5316 measurements of relative positions and magnitude differences in 3532 pairs (including 524 unpublished measures made before 2024) with median and minimum separations of 0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>.</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>″</mml:mi> </mml:mrow> </mml:mover> </mml:math> 19 and 12 mas, respectively; nonresolutions of 1723 stars are documented as well. More than 400 pairs have been resolved here for the first time and not resolved by Gaia; among those are 222 TESS objects of interest, 46 inner subsystems in known wider binaries within 100 pc, and 43 subdwarfs. Positional measurements are used to compute or improve binary orbits; elements of 202 orbits with meaningful errors are given here, while preliminary and tentative orbits are published elsewhere. Of special note are orbits with large and accurately measured eccentricities (e.g., e = 0.9866 ± 0.0014 for J13038−2035) and orbits of pre-main-sequence binaries. The Appendix contains parameters of 86 binaries used for calibration of pixel scale and orientation.

The Astronomical JournalVol. 172(1)
Cerro Tololo Inter-American Observatory (CL), United States Naval Observatory (US), United States Navy (US), University of Chile (CL)
National Aeronautics and Space Administration, European Space Agency, Agencia Nacional de Investigación y Desarrollo, U.S. Naval Observatory
Openalex Percentile: Top 100%
Stellar, planetary, and galactic studies
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