As is typical for a complex design that cannot be changed once launched, there are detailed reviews of every portion of design, construction, and proposed operation. La dernière modification de cette page a été faite le 22 mai 2018 à 19:00. 2007 News. It is mainly an infrared telescope but also works in the red part of the visible light (the pictures will be coded with false color so we can see them). Observations in infrared allow the study of objects and regions of space which would be obscured by gas and dust in the visible spectrum,[134] such as the molecular clouds where stars are born, the circumstellar disks that give rise to planets, and the cores of active galaxies. [8], To make observations in the near and mid infrared spectrum, the JWST must be kept very cold (under 50 K (−220 °C; −370 °F)), otherwise infrared radiation from the telescope itself would overwhelm its instruments. [61] This distant orbit would have benefited from reduced light noise from zodiacal dust. [15][16] In March 2018, NASA further delayed the launch after the telescope's sunshield ripped during a practice deployment. "NASA Announces New James Webb Space Telescope Target Launch Date", "How does the Webb Contrast with Hubble? The model was intended to give the viewing public a better understanding of the size, scale and complexity of the satellite, as well as pique the interest of viewers in science and astronomy in general. 2005 News. It will have a main mirror that is 6.5 metres (21 feet) wide. [24] This has meant most infrared telescopes have a lifespan limited by their coolant, as short as a few months, maybe a few years at most. Sunshield is a component of the James Webb Space Telescope, designed to shield the main optics from the Sun's heat and light.This is part of a space telescope and it extends out unfolding a large metal-coated sheet of material post-launch. 2009 News. [74], In January 2007, nine of the ten technology development items in the project successfully passed a Non-Advocate Review. [2] The silicon-doped aluminum layer is 50 nanometers (nm) thick. This distant orbit would have benefited from reduced light noise from zodiacal dust. [33][3] The observatory attaches to the Ariane 5 rocket via a launch vehicle adapter ring which could be used by a future spacecraft to grapple the observatory to attempt to fix gross deployment problems. [48] The other two major elements of the JWST are the Integrated Science Instrument Module (ISIM) and the Optical Telescope Element (OTE). In March 2013, the model was on display in Austin for SXSW 2013. The design emphasizes the near to mid-infrared for three main reasons: high-redshift objects have their visible emissions shifted into the infrared, cold objects such as debris disks and planets emit most strongly in the infrared, and this band is difficult to study from the ground or by existing space telescopes such as Hubble. [72] The primary technical outcomes of the re-planning were significant changes in the integration and test plans, a 22-month launch delay (from 2011 to 2013), and elimination of system-level testing for observatory modes at wavelength shorter than 1.7 micrometers. JWST in Space Environment Simulation Laboratory Chamber A for thermal test (1) ... NASA Engineers Conduct Low Light Test on New Technology for NASA Webb Telescope (15119297052).jpg 4 256 × 2 832 ; 2,07 Mio. This material blocks the Sun's light and heat, so the telescope can see the faint light coming from stars and galaxies. [92] By the mid-2010s, the U.S. contribution was still expected to cost US$8.8 billion. The telescope is named after James E. Webb, who was a director at NASA and created the Apollo program that put astronauts on the moon. [14], Learn how and when to remove this template message, "This Sunshield Will Keep the World's Most Powerful Space Telescope from Frying", "NASA – Super-Tough Sunshield to Fly on the James Webb Space Telescope", "NASA – Testing the Fold: The James Webb Space Telescope's Sunshield", "Status of the JWST sunshield and spacecraft", "Final layer of sunshield completed for NASA's James Webb Space Telescope", "NASA Delays Launch of James Webb Space Telescope Until 2020", Engineering the James Webb Space Telescope Section The JWST Sunshield, https://en.wikipedia.org/w/index.php?title=Sunshield_(JWST)&oldid=972242066, Wikipedia articles that are too technical from January 2017, Creative Commons Attribution-ShareAlike License, Momentum Trim Tab (the tab is attached to the aft structure assembly), Aft spreader bars (spreads layers in the rear), Mid-spreader bars (spreads the 5 layers apart), Two forward and Two aft Bipod launch lock assemblies, 100 nm (3.93 microinches) aluminum coating (Both sides), 50 nanometers (nm) (1.9 microinches) silicon-doped aluminum, 2007 or before, TRL6 achieved for the Sunshield membrane. [3] However, in the long term even stored on Earth, Kapton used on the Skylab Apollo Telescope Mount had degraded after 40 years. In November 2017, the Space Telescope Science Institute announced the selection of 13 Director's Discretionary Early Release Science (DD-ERS) programs, chosen through a competitive proposal process. [79], Assembly of the hexagonal segments of the primary mirror, which was done via robotic arm, began in November 2015 and was completed in February 2016. By May 2007, costs were still on target. This arrangement will keep the temperature of the spacecraft below 50 K (−223.2 °C; −369.7 °F), necessary for infrared observations. This page was last changed on 29 April 2020, at 09:39. Unlike the Hubble telescope, which observes in the near ultraviolet, visible, and near infrared (0.1 to 1 μm) spectra, the JWST will observe in a lower frequency range, from long-wavelength visible light through mid-infrared (0.6 to 28.3 μm), which will allow it to observe high redshift objects that are too old and too distant for Hubble to observe.
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