This paper discusses the use of Shack—Hartmann wavefront sensors to determine the
vertical distribution of atmospheric optical turbulence above large telescopes. It is …

ULTRACAM is a portable, high-speed imaging photometer designed to study faint
astronomical objects at high temporal resolutions. ULTRACAM employs two dichroic …

HiPERCAM is a portable, quintuple-beam optical imager that saw first light on the 10.4-m
Gran Telescopio Canarias (GTC) in 2018. The instrument uses re-imaging optics and four …

Through selection of short exposure images we achieve diffraction-limited I-band imaging
from well-figured ground-based telescopes as large as 2.5 m diameter. The faint limiting …

Characterization of atmospheric optical turbulence is crucial for the design and operation of
modern ground-based optical telescopes. In particular, the effective application of adaptive …

Fast-Fourier-transform-based simulations of single-layer atmospheric von Kármán phase
screens and Kolmogorov scintillation screens up to hundreds of meters in size were …

An on-line estimation of turbulence parameters (r 0, L 0 and wind speed) and adaptive
optics (AO) performance is presented. The method is based on the reconstruction of open …

Abstract pt5m is a 0.5 m robotic telescope located on the roof of the 4.2 m William Herschel
Telescope (WHT) building, at the Roque de los Muchachos Observatory, La Palma. Using a …

We present an analysis of the science image quality obtained on the twin 6.5 m Magellan
telescopes over a 1.5 yr period, using images of∼ 10 5 stars. We find that the telescopes …

High-altitude wind has been recently proposed as an important parameter to be taken into
account for astronomical site selection. We present here comprehensive and reliable …