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Subsection of the James Webb Space Telescope
Optical Telescope Element (OTE) is one of three major sections of the James Webb Space Telescope, a large infrared space telescope launched on 25 December
Optical_Telescope_Element
Telescope for observations with visible light
An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual
Optical_telescope
NASA/ESA/CSA space telescope launched in 2021
the Optical Telescope Element review completed in October 2009, and the Sunshield review completed in January 2010. In April 2010, the telescope passed
James_Webb_Space_Telescope
Type of optical telescope
A refracting telescope (also called a refractor or dioptric telescope) is a type of optical telescope that uses a lens as its objective to form an image
Refracting_telescope
Specialized Cassegrain telescope
off-axis optical errors (coma). The RCT has a wider field of view free of optical errors compared to a more traditional reflecting telescope configuration
Ritchey–Chrétien_telescope
Part of the James Webb Space Telescope
structural components. The other three elements of the JWST are the Optical Telescope Element (OTE), the Integrated Science Instrument Module (ISIM), and the
Spacecraft bus (James Webb Space Telescope)
Spacecraft_bus_(James_Webb_Space_Telescope)
NASA infrared space telescope
announced it had awarded a contract for the telescope. This was for a part called the Optical Telescope Assembly (OTA), and ran to 2025. This was in
Nancy Grace Roman Space Telescope
Nancy_Grace_Roman_Space_Telescope
Optical system where refraction and reflection are combined
headlamps, early lighthouse focusing systems, optical telescopes, microscopes, and telephoto lenses. Other optical systems that use lenses and mirrors are also
Catadioptric_system
Reflecting telescope design
three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations – spherical aberration
Three-mirror_anastigmat
mirrors completed. 3 March 2016: secondary mirror installed on Optical Telescope Element (OTE). March 2016: Aft Optics Subsystem installed on OTE. November
Timeline of the James Webb Space Telescope
Timeline_of_the_James_Webb_Space_Telescope
Telescope for optical astronomy
The Large Binocular Telescope (LBT) is an optical telescope for astronomy located on 10,700-foot (3,300 m) Mount Graham, in the Pinaleno Mountains of
Large_Binocular_Telescope
Telescopes which utilize curved mirrors to form an image
from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large
Reflecting_telescope
Part of the James Webb Space Telescope
major sections of the JWST are the Optical Telescope Element (OTE) (mirrors and their structure) and the Spacecraft Element (SE), which includes the spacecraft
Integrated Science Instrument Module
Integrated_Science_Instrument_Module
Apollo spacecraft guidance system
The LM had an Alignment Optical Telescope (AOT), which was essentially a periscope, with no magnification. The outer element of the AOT was a sun-shielded
Apollo_PGNCS
Main cooling system for the infrared observatory
California for testing. During launch it was wrapped around the Optical Telescope Element and then later unfolded. The sunshield was planned to be unfolded
James Webb Space Telescope sunshield
James_Webb_Space_Telescope_sunshield
Telescope in the Atacama Desert, Chile
four individual telescopes, each equipped with a primary mirror that measures 8.2 metres (27 ft) in diameter. These optical telescopes, named Antu, Kueyen
Very_Large_Telescope
Japanese telescope and observatory
Subaru Telescope (すばる望遠鏡, Subaru Bōenkyō) is the 8.2-metre (320 in) telescope of the National Astronomical Observatory of Japan, located at the Mauna Kea
Subaru_Telescope
Instrument that makes distant objects appear magnified
Originally, it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the
Telescope
English astronomical interferometer observatory
COAST, the Cambridge Optical Aperture Synthesis Telescope, is a multi-element optical astronomical interferometer with baselines of up to 100 metres, which
Cambridge Optical Aperture Synthesis Telescope
Cambridge_Optical_Aperture_Synthesis_Telescope
The OTE Pathfinder (for Optical Telescope Element Pathfinder), or James Webb Space Telescope Pathfinder, is a technology demonstrator and test article
OTE_Pathfinder
2023 film
production of the James Webb Space Telescope and its impact on the technological improvements it made upon the Hubble Space Telescope. Although it was filmed in
Deep_Sky
single element lens whereas most of this list are doublets, with a crown and flint lens elements. Lists of telescopes List of largest optical reflecting
List of largest optical refracting telescopes
List_of_largest_optical_refracting_telescopes
Imaging instrument aboard the James Webb Space Telescope
F470N – H 2 F480M – Brown dwarfs, planets, continuum Optical Telescope Element James Webb Space Telescope timeline Near Infrared Camera and Multi-Object Spectrometer
NIRCam
Australian Astronomical Observatory telescope
productive 4-metre-class optical telescope in the world based on scientific publications using data from the telescope. The telescope was commissioned in 1974
Anglo-Australian_Telescope
American astronomical observatory
facilities: A 2.4-meter fast-tracking optical telescope has been operational at the site since 2008. A ten-element optical interferometer that is under construction
Magdalena_Ridge_Observatory
Lowell Observatory aperture telescope
Discovery Telescope is the fifth largest optical telescope in the continental United States (as of 2026[update]). Final construction of the telescope was completed
Lowell_Discovery_Telescope
First operational image from NASA's James Webb Space Telescope
Marshall D.; et al. (1 May 2023). "The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance". Publications of
Webb's_First_Deep_Field
Optical instrument to verify horizontal points
level relationship between two or more points, for which an inbuilt optical telescope and a highly accurate bubble level are used to achieve the necessary
Level_(optical_instrument)
Astronomical observatory in Chile
Large-aperture Synoptic Survey Telescope (LSST) is a 6.5-m-class optical telescope designed to survey the visible sky every week down to a much fainter
Vera_C._Rubin_Observatory
American retail company
with or without (sold as optical tube assemblies or "OTA") a variety of mounts. Orion also sold a series of Dobsonian telescopes that come in "Classic"
Orion_Telescopes_&_Binoculars
Directional radio antenna used in radio astronomy
optical telescopes are used to make observations in the visible portion of the spectrum in traditional optical astronomy. Unlike optical telescopes,
Radio_telescope
Astronomical methodology
In optical astronomy, interferometry is used to combine signals from two or more telescopes to obtain measurements with higher resolution than could be
Astronomical optical interferometry
Astronomical_optical_interferometry
Topics referred to by the same term
Operational Test and Evaluation Directorate Optical Telescope Element, a sub-section of the James Webb Space Telescope Ordinary time earnings, the basis used
OTE_(disambiguation)
Combination of concave and convex mirrors
used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's
Cassegrain_reflector
before the image plane of a telescope.[citation needed] Telecompressor or focal reducer: Optical element to decrease the telescope's focal length and magnification
List of telescope parts and construction
List_of_telescope_parts_and_construction
Canadian aligner and spectrometer on JWST
James Webb Space Telescope timeline MIRI (Mid-Infrared Instrument) (JWST's 5–28 micron camera/spectrograph) Optical Telescope Element (JWST's main mirror
Fine Guidance Sensor and Near Infrared Imager and Slitless Spectrograph
Fine_Guidance_Sensor_and_Near_Infrared_Imager_and_Slitless_Spectrograph
Array used for astronomical observations
interferometer or telescope array is a set of separate telescopes, mirror segments, or radio telescope antennas that work together as a single telescope to provide
Astronomical_interferometer
Telescope in La Palma, Spain
The William Herschel Telescope (WHT) is a 4.20-metre (165 in) optical and near-infrared reflecting telescope located at the Roque de los Muchachos Observatory
William_Herschel_Telescope
largest optical telescopes in the 19th century includes what were large optical telescopes for their time. See List of largest optical telescopes in the
List of largest optical telescopes in the 19th century
List_of_largest_optical_telescopes_in_the_19th_century
Catadioptric telescope design
aspheric correction is applied to some element in the optical system. Rutten, Harrie; van Venrooij, Martin (1988). Telescope Optics: Evaluation and Design. Richmond
Maksutov_telescope
a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes. This list combines
List of large optical telescopes
List_of_large_optical_telescopes
Dominican-American space engineer
Webb telescope during its December 25, 2021 launch, and worked on its console throughout its commissioning. She also worked on its Optical Telescope Element
Scarlin_Hernandez
Telescope on La Plama, Canary Islands
Stockholm University. The primary element is a single fused silica lens, making it the largest optical refracting telescope in use in the world. The SST,
Swedish_Solar_Telescope
Telescope in California, United States
1-m Solar Telescope. (The many larger telescopes in use today are reflecting telescopes, with a mirror rather than lens as the major optical component
James_Lick_telescope
Measurement method using interference of waves
modulators to sensors to optical switches. Some proposed and future extremely large astronomical telescopes, such as the Thirty Meter Telescope and the Extremely
Interferometry
Future observatory in the United States
Telescope (GSMT), and the Very Large Optical Telescope (VLOT). These studies would eventually define the Thirty Meter Telescope. The TMT would have nine times
Thirty_Meter_Telescope
Refracting telescope design that reduces chromatic aberration
Fraunhofer doublet. Apochromat History of telescopes List of telescope types Kidger, M.J. (2002) Fundamental Optical Design. SPIE Press, Bellingham, WA, pp
Achromatic_telescope
Type of optical instrument
from the original on 17 May 2011. Retrieved 17 May 2026. Optical Telescope Element (used this sensor in development of the James Webb Space Telescope)
Shack–Hartmann wavefront sensor
Shack–Hartmann_wavefront_sensor
Observatory
The Multi-Element Radio Linked Interferometer Network (MERLIN) is an interferometer array of radio telescopes spread across England. The array is run
MERLIN
Branch of physics that studies light
modern telescopes are reflecting telescopes, that is, telescopes that use a primary mirror rather than an objective lens. The same general optical considerations
Optics
Tubeless telescope (17th century)
not clear if they actually invented it. Telescopes built in the 17th and early 18th century used single element non-achromatic objective lenses that suffered
Aerial_telescope
photographed in the light of one element only 1897 – Alvan Clark finishes the Yerkes 40-inch (1.0 m) optical refracting telescope, located in Williams Bay, Wisconsin
Timeline of telescopes, observatories, and observing technology
Timeline_of_telescopes,_observatories,_and_observing_technology
Radio telescope at Jodrell Bank Observatory, Cheshire, England
The Lovell Telescope (/ˈlʌvəl/ LUV-əl) is a radio telescope at Jodrell Bank Observatory, near Goostrey, Cheshire, in the north-west of England. Completed
Lovell_Telescope
Observatory
optical telescopes for observing celestial objects. This came to be known as Kavalur Observatory. Observations began in 1968 with a 38 cm telescope made
Vainu_Bappu_Observatory
mirror cell - is a component of a reflecting telescope that supports the mirror in place to hold optical alignment, allow collimation adjustment, and
Mirror_support_cell
SSA system
an optical system. Each site has three telescopes. The telescopes have a 40-inch (100 cm) aperture and a two-degree field of view. The telescopes are
United States Space Surveillance Network
United_States_Space_Surveillance_Network
Telescope focusing device
The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive
Bahtinov_mask
Telescope that makes observations without the intervention of a human
In May 2002, they completed the Rigel Telescope. The Rigel was a 0.37-meter (14.5-inch) F/14 built by Optical Mechanics, Inc. and controlled by the Talon
Robotic_telescope
Former radio telescope in Puerto Rico, United States
The Arecibo Telescope was a 305 m (1,000 ft) spherical reflector radio telescope built into a natural sinkhole at the Arecibo Observatory located near
Arecibo_Telescope
are used to direct infrared light within the optical path of the James Webb Space Telescope. These optical fold mirrors are not to be confused with the
Folded_optics
Four-meter reflector telescope in Pima County, Arizona
Peak optical lab. The telescope primary mirror is designed to function as the first element in a Ritchey–Chrétien optical design. The telescope was originally
Nicholas_U._Mayall_Telescope
Optical lens used to increase focal length
Peter Barlow (1776–1862), is an optical tube with diverging lens elements that, used in series with other optics in an optical system, increase the effective
Barlow_lens
Type of lens attached to a variety of optical devices such as telescopes and microscopes
lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens
Eyepiece
Radio telescope array
The Deep Synoptic Array (DSA) is a radio telescope array that will contain 1,650 steerable 6.15-metre (20 ft 2 in) parabolic antennas that observe the
Deep_Synoptic_Array
Telescope located at the University of Texas at Austin observatory
contains a supermassive black hole. Four largest telescopes 1968: List of largest optical reflecting telescopes "Observatory Damaged by Gunfire". El Paso Herald-Post
Harlan_J._Smith_Telescope
Visual aiming device
refracting telescope equipped with some form of referencing pattern (reticle) mounted in an optically appropriate position in the optical system to give
Sight_(device)
Astronomical observatory in the Canary Islands, Spain
telescopes from different countries around the world because of the good astronomical seeing conditions. Later, the emphasis for optical telescopes shifted
Teide_Observatory
part of a telescope mirror by another part, whereas finite element analysis can be used to reduce such stress. Although general finite element analysis
PLate_OPtimizer
Telescope focusing device
to check the quality of large optical mirrors. It was especially useful for large non-spherical mirrors for telescopes. For example, the illustration
Hartmann_mask
Astronomical observatory in Cheshire, England
discovered by optical astronomy. The "Mark I" telescope, now known as the Lovell Telescope, was the world's largest steerable dish radio telescope, 76.2 metres
Jodrell_Bank_Observatory
Type of lens
shape of a negative element. Gauss first described the arrangement in 1817. Alvan Clark & Sons built a 9+1⁄2 in (240 mm) telescope for Princeton University
Gauss_lens
A prism spectrometer is an optical spectrometer which uses a dispersive prism as its dispersive element. The prism refracts light into its different colors
Prism_spectrometer
Effort to find civilizations not from Earth
155-centimeter (61-inch) optical telescope. This telescope is currently being used for a more conventional star survey, and the optical SETI survey is "piggybacking"
Search for extraterrestrial intelligence
Search_for_extraterrestrial_intelligence
Spectrograph on the James Webb Space Telescope
instruments flown on the James Webb Space Telescope (JWST). The JWST is the follow-on mission to the Hubble Space Telescope (HST) and was developed to receive
NIRSpec
Instrument to measure the properties of visible light
An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion
Optical_spectrometer
Deviation from perfect paraxial optical behavior
reproduction seldom have practical importance. Aberrations of the eye Optical telescope § The five Seidel aberrations Wavefront coding Lateral chromatic aberration
Optical_aberration
Topics referred to by the same term
detects light. Ocular may also refer to: Eyepiece, the optical element closest to the eye in a telescope or microscope Ocular scales, a type of scales surrounding
Ocular_(disambiguation)
Shaping technology for reflecting telescopes
class telescopes is not possible, nor would telescopes with segmented mirrors be feasible. This method is used by, among others, the Nordic Optical Telescope
Active_optics
Telescope designed to observe remote objects by detecting X-rays
Because the Sun is so bright in X-rays, early X-ray telescopes could use a small focusing element and the X-rays would be detected with photographic film
X-ray_telescope
Microscope that uses visible light
The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate
Optical_microscope
Tower-based signaling network
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical
Optical_telegraph
Division of astronomy
observation purposes, the optimal location for an optical telescope is undoubtedly in outer space. There the telescope can make observations without being affected
Observational_astronomy
Astronomic observatory in New South Wales, Australia
fully automatic mode. The telescope has an optical design that more resembles that of a Schmidt camera, but has a 3-element lens to achieve a wide, corrected
Siding_Spring_Observatory
Lens or mirror in optical instruments
In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce
Objective_(optics)
Optical system that produces no net convergence or divergence of the beam
focal length fi (d = f1+f2). A simple example of an afocal optical system is an optical telescope imaging a star, the light entering the system is from the
Afocal_system
Type of camera lens with long focal length
long-focus lens by combining a shorter focal length telescope objective lens with negative lenses and other optical parts from opera glasses to modify the light
Telephoto_lens
Telescope in the Atacama Desert, northern Chile
metamaterial silicon, an innovation in ground based CMB telescopes at the time. The optical components and the detector module are kept at a vacuum with
Atacama_Cosmology_Telescope
or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF)
Telecompressor
Mounting system for optics
the child to construct various optical instruments such as a telescope, microscope, and spectroscope. An advanced optical erector set called Microbench
Optical_cage_system
Proposed ultra-lightweight design for a space telescope
far not been used for astronomy. No optical material is involved in the focusing process as in traditional telescopes. Rather, the light collected by the
Fresnel_imager
Catadioptric reflector for search lights
Terebizh, V. Yu. (2007). "Wide-field telescopes with a Mangin mirror". arXiv:0710.2165 [astro-ph]. Britannica Optical design fundamentals for infrared systems
Mangin_mirror
Arrangement of mirrors
An optical cavity, resonating cavity or optical resonator is an arrangement of mirrors or other optical elements that confines light waves similarly to
Optical_cavity
Toy lenses for Nikon SLR cameras
barrel, which was dropped in favorable of a manually telescoping barrel; this made the optical design a little more complex, and it was the last lens
Nikon_Amusing_Lenses
This is a list of radio telescopes – over one hundred – that are or have been used for radio astronomy. The list includes both single dishes and interferometric
List_of_radio_telescopes
Type of dish antenna designed in the 1970s
the secondary mirror laterally and along the optical axis. A unique feature of the Leighton telescopes is that the primary is fabricated as a single
Leighton_Radio_Telescopes
Optical sighting device for firearms
sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. Sights are equipped with a referencing pattern
Telescopic_sight
Virtual aperture in an optical system
pupil can leave the system. In a telescope or compound microscope, the exit pupil is the image of the objective element(s) as produced by the eyepiece.
Exit_pupil
Subfield of astronomy that studies celestial objects at radio frequencies
observed, radio telescopes have to be much larger in comparison to their optical counterparts. For example, a 1-meter diameter optical telescope is two million
Radio_astronomy
Array of smaller mirrors designed to act as one large curved mirror
from their light guides, which is used as an optical smartglass element. Some of the largest optical telescopes in the world use segmented primary mirrors
Segmented_mirror
Chemical element with atomic number 80 (Hg)
Mercury is a chemical element; it has symbol Hg and atomic number 80. It is commonly known as quicksilver. A heavy, silvery d-block element, mercury is the
Mercury_(element)
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT
OPTICAL TELESCOPE-ELEMENT