Results 21 to 30 of about 665,255 (368)

Telescopic actions [PDF]

open access: yesGeometric and Functional Analysis, 2012
+higher ...
Panov, D., Petrunin, A.
openaire   +5 more sources

The First Telescope in the Korean History I. Translation of Jeong`s Report [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2009
In 1631 A.D. Jeong Duwon, an ambassador of the Joseon dynasty was sent to the Ming dynasty. There he met João Rodrigues, a Jesuit missionary, in Dengzhou of Shandong peninsula.
Sang-Hyeon Ahn
doaj   +1 more source

Baccio del Bianco and the artistic fortuna of Galileo’s Il Saggiatore

open access: yesGalilæana, 2023
This contribution takes into consideration Galileo’s Il Saggiatore as an overlooked source for the arts in Florence during the first part of the seventeenth century.
Eva Struhal
doaj   +1 more source

Turbulent parameters at different heights in the atmosphere. Shack–Hartmann wavefront sensor data

open access: yesSolar-Terrestrial Physics, 2022
The paper presents the results of studies of wavefront distortions at different heights in the atmosphere. We have used measurement wavefront data to determine optical turbulence parameters along the line of sight of the Large Solar Vacuum Telescope ...
Shikhovtsev A. Y.   +5 more
doaj   +1 more source

Highly Reflective Silver-Enhanced Coating with High Adhesion and Sulfurization Resistance for Telescopes

open access: yesNanomaterials, 2022
Highly reflective metal coatings are essential for manufacturing reflecting telescope mirrors to achieve the highest reflectivity with broad spectral bandwidth.
Hsing-Yu Wu   +6 more
doaj   +1 more source

In-flight performance and calibration of the Infrared Array Camera (IRAC) for the Spitzer Space Telescope [PDF]

open access: yesSPIE Astronomical Telescopes + Instrumentation, 2004
The Infrared Array Camera (IRAC) is one of three focal plane instruments on board the Spitzer Space Telescope. IRAC is a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 μm in two nearly adjacent fields of view ...
G. Fazio   +64 more
semanticscholar   +1 more source

The large size telescope of the Cherenkov Telescope Array [PDF]

open access: yesSPIE Proceedings, 2014
The Cherenkov Telescope Array (CTA) project aims to implement the world’s largest next generation of Very High Energy gamma-ray Imaging Atmospheric Cherenkov Telescopes devoted to the observation from a few tens of GeV to more than 100 TeV. To view the whole sky, two CTA sites are foreseen, one for each hemisphere.
E. Lorenz   +127 more
openaire   +4 more sources

Optical Design of a Novel Wide-Field-of-View Space-Based Spectrometer for Climate Monitoring

open access: yesSensors, 2022
We report on a near-infrared imaging spectrometer for sensing the three most prominent greenhouse gases in the atmosphere (water vapor, carbon dioxide and methane).
Luca Schifano   +3 more
doaj   +1 more source

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION [PDF]

open access: yes, 2009
The Large Area Telescope (Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy γ-ray telescope, covering the energy range from below 20 MeV to more ...
W. Atwood   +239 more
semanticscholar   +1 more source

First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole [PDF]

open access: yesAstrophysical Journal, 2019
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using ...
K. Akiyama   +213 more
semanticscholar   +1 more source

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