Results 1 to 10 of about 83,260 (295)

Probing Diversity of Type II Supernovae with the Chinese Space Station Telescope

open access: yesUniverse, 2023
Type II supernovae (SNe II), which show abundant hydrogen in their spectra, belong to a class of SNe with diverse observed properties. It is commonly accepted that SNe II are produced by core collapse and explosion of massive stars.
Han Lin, Jujia Zhang, Xinghan Zhang
doaj   +1 more source

A correction method of encoder bias in satellite laser ranging system

open access: yesGeodesy and Geodynamics, 2013
In a satellite laser ranging telescope system, well-aligned encoders of the elevation and azimuth axes are essential for tracking objects. However, it is very difficult and time-consuming to correct the bias between the absolute-position indices of the ...
Wang Peiyuan   +3 more
doaj   +1 more source

Imagining the Heavens: Adam Elsheimer’s Flight into Egypt and the Renaissance Night Sky

open access: yesJournal for the History of Knowledge, 2021
Adam Elsheimer’s The Flight into Egypt (1609) has triggered a longstanding debate among art historians. For the last five decades, Elsheimer’s novel naturalistic representation of the night sky in his painting on copper has been linked to Galileo’s ...
Stefan Zieme
doaj   +1 more source

Research on Telescope TTL Coupling Noise in Intersatellite Laser Interferometry

open access: yesPhotonic Sensors, 2019
The detection mission of gravitational waves in space is that the accuracy of the long-baseline intersatellite laser interferometry on the million-kilometer order needs to reach the order of $$8 \rm{pm}/\sqrt{\rm{Hz}}$$ 8 p m / H z .
Zhi Wang   +10 more
doaj   +1 more source

Features of exoplanet discovering at our Galaxy's star ecliptics by the example of identification of the seventh transit at the light curve from the star KOI-351

open access: yesВісник Астрономічної школи, 2016
Results of the exoplanet search in KOI-351 star system using the remote computer analysis and processing of light curves made by the orbiting telescope “Kepler” are presented.
A. V. Kobzar
doaj   +1 more source

Project of the Large Solar Telescope with mirror 3 m in diameter

open access: yesSolar-Terrestrial Physics, 2020
One of the most important problems of modern solar physics is the observation of the small-scale structure of the solar atmosphere at various heights (including the chromosphere and corona) in different spectral lines.
Grigoryev V.M.   +5 more
doaj   +1 more source

Active optics: deformable mirrors with a minimum number of actuators [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2012
We present two concepts of deformable mirror to compensate for first order optical aberrations. Deformation systems are designed using both elasticity theory and Finite Element Analysis in order to minimize the number of actuators.
Laslandes M., Hugot E., Ferrari M.
doaj   +1 more source

Freeform Wide Field-of-View Spaceborne Imaging Telescope: From Design to Demonstrator

open access: yesSensors, 2022
Wide field-of-view imaging optics offer a huge potential for space-based Earth observation enabling the capture of global data. Reflective imaging telescopes are often favored, as they do not show chromatic aberrations and are less susceptible to ...
Luca Schifano   +7 more
doaj   +1 more source

Modified Method to Detect the Turbulent Layers in the Atmospheric Boundary Layer for the Large Solar Vacuum Telescope

open access: yesAtmosphere, 2021
A method to detect the atmospheric turbulent layers using a single Shack–Hartmann wavefront sensor is discussed. In order to determine the height distribution of the atmospheric turbulence above a telescope, we register the wavefront distortions at ...
Artem Yurievich Shikhovtsev   +6 more
doaj   +1 more source

Optimizing Space Telescopes’ Thermal Performance through Uncertainty Analysis: Identification of Critical Parameters and Shaping Test Strategy Development

open access: yesAerospace
The integration of uncertainty analysis methodologies allows for improving design efficiency, particularly in the context of instruments that demand precise pointing accuracy, such as space telescopes.
Uxia Garcia-Luis   +5 more
doaj   +1 more source

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