Corrective Optics Space Telescope Axial Replacement (COSTAR)

E183138

Hubble Space Telescope instrument optical correction instrument space telescope hardware

Corrective Optics Space Telescope Axial Replacement (COSTAR) was a set of corrective mirrors installed on the Hubble Space Telescope to compensate for its flawed primary mirror and restore its intended imaging performance.

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All labels observed (4)

Label	Occurrences
Corrective Optics Space Telescope Axial Replacement	7
COSTAR corrective optics	1
Corrective Optics Space Telescope Axial Replacement (COSTAR) canonical	1
Hubble Space Telescope optical system	1

How this entity was disambiguated

This entity first appeared as the object of triple T1617646 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Corrective Optics Space Telescope Axial Replacement (COSTAR)
Context triple: [STS-61, payload, Corrective Optics Space Telescope Axial Replacement (COSTAR)]

A. Faint Object Camera
The Faint Object Camera was a high-resolution imaging instrument on the Hubble Space Telescope designed to observe very dim and distant astronomical objects in ultraviolet and visible light.
B. Space Telescope Imaging Spectrograph
The Space Telescope Imaging Spectrograph is a versatile instrument on the Hubble Space Telescope that performs high-resolution imaging and spectroscopy across ultraviolet, visible, and near-infrared wavelengths to study the physical properties of astronomical objects.
C. Fine Guidance Sensor
The Fine Guidance Sensor is a high-precision pointing and stabilization instrument on the James Webb Space Telescope that locks onto guide stars to keep the observatory accurately aimed during observations.
D. Hubble Space Telescope
The Hubble Space Telescope is a large, space-based observatory that has provided some of the most detailed images and data about the universe, revolutionizing modern astronomy and cosmology.
E. Mikulski Archive for Space Telescopes
The Mikulski Archive for Space Telescopes is NASA’s primary online repository for astronomical data from major space-based observatories, including Hubble and other missions.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Corrective Optics Space Telescope Axial Replacement (COSTAR)
Target entity description: Corrective Optics Space Telescope Axial Replacement (COSTAR) was a set of corrective mirrors installed on the Hubble Space Telescope to compensate for its flawed primary mirror and restore its intended imaging performance.

A. Faint Object Camera
The Faint Object Camera was a high-resolution imaging instrument on the Hubble Space Telescope designed to observe very dim and distant astronomical objects in ultraviolet and visible light.
B. Space Telescope Imaging Spectrograph
The Space Telescope Imaging Spectrograph is a versatile instrument on the Hubble Space Telescope that performs high-resolution imaging and spectroscopy across ultraviolet, visible, and near-infrared wavelengths to study the physical properties of astronomical objects.
C. Fine Guidance Sensor
The Fine Guidance Sensor is a high-precision pointing and stabilization instrument on the James Webb Space Telescope that locks onto guide stars to keep the observatory accurately aimed during observations.
D. Hubble Space Telescope
The Hubble Space Telescope is a large, space-based observatory that has provided some of the most detailed images and data about the universe, revolutionizing modern astronomy and cosmology.
E. Mikulski Archive for Space Telescopes
The Mikulski Archive for Space Telescopes is NASA’s primary online repository for astronomical data from major space-based observatories, including Hubble and other missions.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	Hubble Space Telescope instrument ⓘ optical correction instrument ⓘ space telescope hardware ⓘ
abbreviation	COSTAR ⓘ
afterRemovalLocation	Smithsonian National Air and Space Museum ⓘ linked to: National Air and Space Museum, Washington, D.C.
associatedEvent	Hubble Space Telescope optical flaw correction ⓘ
category	Hubble Space Telescope component ⓘ space optics ⓘ space telescope instrumentation ⓘ
correctedInstrument	Faint Object Camera ⓘ Faint Object Spectrograph ⓘ Goddard High Resolution Spectrograph ⓘ
countryOfOrigin	United States ⓘ linked to: United States of America
designFeature	deployable optical arms with small corrective mirrors ⓘ optics tailored to compensate Hubble primary mirror spherical aberration ⓘ
developedBy	Ball Aerospace ⓘ NASA Goddard Space Flight Center ⓘ linked to: Goddard Space Flight Center
exhibitedAt	National Air and Space Museum Udvar-Hazy Center ⓘ linked to: Steven F. Udvar-Hazy Center
fullName	Corrective Optics Space Telescope Axial Replacement ⓘ linked to: Corrective Optics Space Telescope Axial Replacement (COSTAR)
function	insert corrective mirrors into the optical paths of Hubble instruments ⓘ
heritage	custom-designed for Hubble after discovery of mirror flaw in 1990 ⓘ
impact	restored diffraction-limited performance to corrected instruments ⓘ
installationDate	December 1993 ⓘ
installedByMission	STS-61 ⓘ
installedOn	Hubble Space Telescope ⓘ
launchedWithMission	STS-61 ⓘ
location	Hubble Space Telescope axial instrument bay ⓘ
mass	approximately 600 kilograms ⓘ
missionRole	interim optical correction until new corrected instruments were installed ⓘ
notable	first on-orbit optical correction system for a major space telescope ⓘ
operator	NASA ⓘ
orbit	low Earth orbit via Hubble Space Telescope ⓘ
partOf	Hubble Space Telescope optical system ⓘ linked to: Corrective Optics Space Telescope Axial Replacement (COSTAR)
powerRequirement	approximately 500 watts ⓘ
problemAddressed	Hubble primary mirror spherical aberration ⓘ
purpose	correct spherical aberration of Hubble primary mirror ⓘ restore Hubble imaging performance to design specifications ⓘ
reliability	operated successfully for more than eight years in orbit ⓘ
removalDate	March 2002 ⓘ
removedByMission	STS-109 ⓘ
replacedBy	Advanced Camera for Surveys ⓘ
replacedInstrument	High Speed Photometer ⓘ
servicingMission	Hubble Servicing Mission 1 ⓘ linked to: Hubble Space Telescope servicing mission 1 Hubble Servicing Mission 3B ⓘ linked to: Hubble Space Telescope Servicing Mission 3B
spacecraft	Hubble Space Telescope ⓘ
status	retired ⓘ
technologyType	reflective optical system ⓘ
usedUntil	2002 ⓘ

How these facts were elicited

Referenced by (10)

Full triples — surface form annotated when it differs from this entity's canonical label.

STS-61 → payload → Corrective Optics Space Telescope Axial Replacement (COSTAR) ⓘ

Cosmic Origins Spectrograph → replacedInstrument → Corrective Optics Space Telescope Axial Replacement ⓘ