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The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance [PDF]

Publications of the Astronomical Society of the Pacific, 2023
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science.
M. McElwain +128 more
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole [PDF]

Astrophysical Journal Letters, 2022
We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm.
Event Horizon Telescope Collaboration +270 more
semanticscholar +1 more source

Energy Spectra of Atmospheric Turbulence for Calculating $C_{n}^{2}$ Parameter. I. Maidanak and Suffa Observatories in Uzbekistan

Atmosphere, 2021
Knowledge of the turbulence spectra is of interest for describing atmospheric conditions as applied to astronomical observations. This article discusses the deformations of the turbulence spectra with heights in a wide range of scales at the sites of the
Artem Yu. Shikhovtsev +5 more
doaj +1 more source

First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass [PDF]

Astrophysical Journal Letters, 2022
In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. We find that the Sgr A* data exhibit variability that exceeds what can be
Event Horizon Telescope Collaboration +269 more
semanticscholar +1 more source

First M87 Event Horizon Telescope Results. VII. Polarization of the Ring [PDF]

Astrophysical Journal Letters, 2021
In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a compact asymmetric ring-like source morphology.
K. Akiyama +238 more
semanticscholar +1 more source

Estimation of Astronomical Seeing with Neural Networks at the Maidanak Observatory

Atmosphere, 2023
In the present article, we study the possibilities of machine learning for the estimation of seeing at the Maidanak Astronomical Observatory (38∘40′24″ N, 66∘53′47″ E) using only Era-5 reanalysis data.
Artem Y. Shikhovtsev +6 more
doaj +1 more source

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole [PDF]

, 2019
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon.
The Event Horizon Telescope Collaboration
semanticscholar +1 more source

James Webb Space Telescope

Resonance, 2022
The James Webb Space Telescope, or JWST, or simply Webb, is a large, space-based observatory, designed primarily to conduct infrared astronomy. The telescope is named after James Edwin Webb (1906–1992), who was the second administrator of NASA during ...
A. Sharma
semanticscholar +1 more source

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

Journal 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

Galilæana, 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

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