Results 11 to 20 of about 6,989,374 (162)

Broadband multi-wavelength properties of M87 during the 2017 Event Horizon Telescope campaign

open access: yes, 2021
In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting ...
The Event Horizon Telescope Collaboration
core   +1 more source

wakaka1o1/Active-Vibration-Control-of-a-Large-Space-Telescope: The First release of my paper code

open access: yes, 2023
<p>"Active Vibration Control of a Large Space Telescope Based On H∞ Control With Unilateral and Constrained Input" part1:Dynamic modeling</p ...
YU, Heng
core   +1 more source

Grinding metre scale mirror segments for the E-ELT ground based telescope [PDF]

open access: yes, 2011
The next generation of ground based telescopes require many hundreds of metre scale off-axis mirrors. In this paper the grinding of a 1.45m scale Zerodur® mirror segment for the European Extremely Large Telescope (E-ELT) is introduced.
P. Shore   +7 more
core   +1 more source

Nautilus: The advent of large lens-based space telescopes [PDF]

open access: yesEPJ Web of Conferences, 2022
One of the most profound and philosophically captivating foci of modern astronomy is studies of Earth-like exoplanets in search of life in the Universe.
Kim Daewook   +2 more
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

Fast figuring of large optics by reactive atom plasma [PDF]

open access: yes, 2012
The next generation of ground-based astronomical observatories will require fabrication and maintenance of extremely large segmented mirrors tens of meters in diameter.
Renaud Jourdain   +7 more
core   +1 more source

A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy

open access: yesInternational Journal of Antennas and Propagation, 2020
The purpose of this paper is to investigate a large radio telescope support point number effect on its pointing accuracy and provide a useful guideline for the large radio telescope design engineer. In a large radio telescope system, the azimuth track is
Song Xue   +8 more
doaj   +1 more source

One Novel Distributed Space Telescope With Payload Formation

open access: yesIEEE Access, 2020
Large aperture space technology is critical for next-step astrophysics missions with high resolution requirement. The distributed telescope has been proven as an appealing solution to break the technical limitation in obtaining large apertures.
Qing Li, Lei Liu, Jun Shen
doaj   +1 more source

Implementation of a laser-truss based telescope metrology system at the Large Binocular Telescope

open access: yes, 2020
Large ground-based telescopes are prone to perturbations caused by environmental factors that affect the mechanical structure of the telescope that can cause collimation loss and image quality degradation.
Kim, Dae Wook   +7 more
core   +1 more source

Design and Development of an acoustic positioning system for a cubic kilometre underwater neutrino telescope [PDF]

open access: yes, 2012
En los últimos años los telescopios submarinos de neutrinos han cobrado una mayor importancia ya que consisten en un nuevo y único instrumento para observar el Universo.
Larosa ., Giuseppina
core   +1 more source

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