Ultraviolet Explorer

UVEX spacecraft render
Mission type	Ultraviolet astronomy
Operator	NASA / Goddard,Caltech
Website	https://www.uvex.caltech.edu/
Mission duration	2 years (planned)[1]
Start of mission
Launch date	2030 (planned)
Orbital parameters
Reference system	Geocentric orbit
Regime	Highly elliptical orbit[2]: 4
Perigee altitude	104,000 km (65,000 mi)[2]: 4
Apogee altitude	396,000 km (246,000 mi)
Period	13.7 days
Main telescope
Type	Three-mirror anastigmat[2]: 4
Diameter	75 cm (30 in)
Focal length	f/2.7
Wavelengths	139–190nm (FUV imager) 203–270nm (NUV imager) 115–265nm (spectrograph)
Resolution	2.25 arcsecond (imager)[1] R ≥ 1000 (spectrograph)
Instruments
Ultraviolet telescope

TheUltraviolet Explorer (UVEX) is an upcoming wide-fieldultravioletspace telescope fromNASA scheduled to launch in 2030.^[1] UVEX will build upon previous ultraviolet space telescopes, specificallyGALEX, conducting surveys of the entire sky in both near- and far-ultraviolet light. UVEX will study the evolution of low-metallicity stars and how they affect the evolution of low-metallicity and low-mass galaxies. The probe can also be used for quick-turnaround observation of cosmic events, such as merging stars. UVEX's data will be able to complement other all-sky survey programs in different wavelengths of light, notably those by theVera C. Rubin Observatory, theNancy Grace Roman Space Telescope, andEuclid. Compared to earlier ultraviolet space telescopes, UVEX will feature more capable instrumentation and a larger mirror, enabling it to obtain higher-resolution data and observe fainter objects.^{[2][page needed]}

UVEX will contain one instrument, consisting of the UV-optimized optical telescope array (OTA) and the UV Instrument Module (UVIM). The OTA consists of a 75 cm (30 in)-diameter primary mirror in athree-mirror anastigmat configuration which will capture and redirect light to three different sensors.

• Two of these belong to the imager, with one featuring coatings to only accept near-ultraviolet (NUV) light, with its counterpart accepting only far-ultraviolet (FUV) light. Both sensors, each consisting of nine 4k x 4k CMOS detectors arranged in a 3 x 3 pattern, are identical apart from their coatings and will receive light from a dichroic, which splits the light beam from the OTA to send each sensor its corresponding wavelengths of light. The dichroic allows both sensor assemblies to image simultaneously. Due to the low focal ratio of the OTA and the large sensors, the imager can capture 3.5° x 3.5° images of the sky at once.^[2]: 4

• The third sensor, a single 4k x 4k detector, belongs to the long-slit spectrograph. Light from the OTA would reach the detector by bypassing the dichroic and passing through the slit and grating.^[2]: 4–5 The spectrograph has a length of 2° and can achieve a maximum resolving power of roughly R = 3500.^{[1][2]: 4–5}

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UVEX is classified as a Medium-Class Explorer (MIDEX) in NASA'sExplorers Program and is planned to launch in 2030. After a period of orbit corrections and instrument commissioning, the probe will begin a two-year series of full-sky surveys. Because of its larger primary mirror, which can capture more light at once than the smaller mirrors of its predecessors, UVEX will observe dimmer and further objects. The probe will reachAB magnitudes greater than 25.8, comparable to the ground-basedVera C. Rubin Observatory.^[1] UVEX will also perform weekly surveys of theMagellanic Clouds, something its predecessors struggled with because of their brightness.^[2]: 4

UVEX's science goals are divided into three "pillars:"^[2]: 4

• Studylow-metallicity stars and their effects on the evolution of their host galaxies. Low-metallicity low-mass galaxies make up about half of the universe's mass, and they are believed to be very similar to the first galaxies that formed. Studying these objects can give insight into how the first stars and galaxies formed just after theBig Bang
• Study ongoing and new events in the universe withtime-domain surveys, allowing quick follow-up to sudden events like stellar mergers. This will provide additional data to ongoing studies ofgravitational waves.
• Create a dataset of ultraviolet all-sky surveys for use by current and future scientists, complementing similar surveys by telescopes in other wavelengths of light (primarilyinfrared andvisible light)

UVEX will operate in a highly elliptical lunar resonance orbit called P/2. This type of orbit is currently in use by theTESS spacecraft, which is also performing whole-sky surveys, although TESS is primarily searching for exoplanets. The P/2 orbit is in a 2:1 resonance with theMoon, meaning that the spacecraft completes two orbits of Earth for every one orbit of the Moon. Because of this resonance, which enables occasional gravitational interactions with the Moon, the orbit is extremely stable. In addition, the orbit avoids theVan Allen belts entirely, drastically reducing wear on spacecraft components. Because of its high altitude and eccentricity, UVEX will take 13.7 days to complete one orbit.^{[2]: 4 [3]}

• Explorer program – Ongoing NASA space exploration programPages displaying short descriptions of redirect targets
• Ultraviolet astronomy
• GALEX – NASA UV space telescope of the Explorer program, operated 2003-2013

• Proposed satellites
• Explorers Program
• Space telescopes

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