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Proceedings Paper

Atmospheric limitations on speckle astrometry with large telescopes
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Paper Abstract

Traditional differential astrometric techniques are limited in precision by the atmosphere in a way that does not show much improvement with increased telescope aperture. However, greatly improved astrometric precision may be obtainable by exploiting the strong aperture dependence of the spatial correlation between simultaneously recorded specklegrams within the speckle isoplanatic angle. The cross-correlation of two speckle iages of a binary star pair may yield higher astrometric precision in the measurement of the binary separation than centroid differences. The degree of this improvement, however, depends strongly upon the effective thickness of the turbulence in the atmosphere. A 5- minute observation using a large-format, rapid-readout CCD at a 2.3-m telescope has demonstrated 1-milliarcsec precision in the determination of the separation of a 7.3 arcsec binary star pair when processed with speckle techniques.

Paper Details

Date Published: 9 June 1994
PDF: 11 pages
Proc. SPIE 2200, Amplitude and Intensity Spatial Interferometry II, (9 June 1994); doi: 10.1117/12.177259
Show Author Affiliations
Richard G. Dekany, Optical Sciences Ctr. and Steward Observatory/Univ. of Arizona (United States)
Matthew Cheselka, Steward Observatory/Univ. of Arizona (United States)
E. Keith Hege, Steward Observatory/Univ. of Arizona (United States)
James Roger P. Angel, Optical Sciences Ctr. and Steward Observatory/Univ. of Arizona (United States)
James W. Beletic, Georgia Technical Research Institute (United States)


Published in SPIE Proceedings Vol. 2200:
Amplitude and Intensity Spatial Interferometry II
James B. Breckinridge, Editor(s)

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