WFIRST

WFIRST
Name	Nancy Grace Roman Space Telescope
Mission type	Space observatory
Operator	National Aeronautics and Space Administration
Manufacturer	Jet Propulsion Laboratory / industry partners
Launch date	Planned 2027
Launch site	Kennedy Space Center
Mass	~6,500 kg
Telescope diameter	2.4 m
Instruments	Wide-Field Instrument, Coronagraph Instrument
Wavelength	0.48–2.3 μm (near-infrared)
Motto	Wide-field infrared survey for dark energy and exoplanets

WFIRST

The Nancy Grace Roman Space Telescope, commonly known by its original name, is a NASA-funded astrophysics mission designed to perform wide-field infrared surveys and direct imaging of exoplanets. The mission combines heritage from Hubble Space Telescope optics and advances from Wide Field Camera 3 technology to deliver deep, high-resolution mapping across large areas of the sky for studies linked to dark energy, exoplanet demographics, and infrared astrophysics. It is implemented by teams at Jet Propulsion Laboratory, NASA Goddard Space Flight Center, and international partners including institutions in Canada.

Overview

The mission uses a 2.4-meter telescope mirror originally produced for a classified program and repurposed in a collaboration between National Reconnaissance Office and National Aeronautics and Space Administration. Its primary payload comprises a Wide-Field Instrument optimized for large-area, high-resolution imaging and slitless spectroscopy and a Coronagraph Instrument for high-contrast imaging and spectroscopy of nearby exoplanetary systems. The observatory is intended to operate in a Sun–Earth L2 orbit similar to James Webb Space Telescope plans, offering thermal stability and continuous sky access. Science drivers trace to recommendations from panels such as the Astro2010 Decadal Survey and programs at Space Telescope Science Institute.

Mission History and Development

Origins date to concepts developed by teams affiliated with Hubble Space Telescope follow-on studies and proposals to the Astronomy and Astrophysics Decadal Survey. The project evolved through phases influenced by budgetary reviews at Congress of the United States, assessments by the Government Accountability Office, and redesigns following technology maturation exercises at Jet Propulsion Laboratory and industrial partners. Key milestones include selection by NASA after peer review panels, delivery of the refigured 2.4 m mirror from government inventories, and instrument downselections coordinated with the European Space Agency and Canadian agencies. Management has balanced inputs from the Science Mission Directorate and advisory committees including the Astrophysics Division.

Spacecraft and Instrumentation

The spacecraft bus design leverages heritage components used on missions such as Wide-field Infrared Survey Explorer, with avionics, power systems, and thermal control developed by aerospace contractors under NASA oversight. The Wide-Field Instrument features a focal plane assembly of near-infrared detectors similar to those used on James Webb Space Telescope and Euclid (spacecraft), providing a field of view hundreds of times larger than Hubble Space Telescope's cameras. The Coronagraph Instrument is a technology demonstration employing deformable mirrors, coronagraph masks, and low-noise detectors to suppress starlight for direct imaging of Jupiter-mass and lower-mass companions around nearby stars identified in catalogs like Gaia. Pointing control uses star trackers and gyros with heritage from Landsat and planetary missions.

Science Goals and Objectives

Primary science objectives address the nature of dark energy through measurements of weak gravitational lensing, baryon acoustic oscillations, and supernova distances, complementing programs carried out by Dark Energy Survey and Euclid (spacecraft). The exoplanet program employs microlensing surveys toward the Galactic Center to measure demographics of cold exoplanets and the Coronagraph Instrument to study atmospheres and circumstellar environments of nearby systems identified by surveys such as Transiting Exoplanet Survey Satellite and Kepler Mission. Additional goals include wide-area infrared surveys for galaxy evolution, star formation studies in nearby galaxies like Andromeda Galaxy, and mapping of the high-redshift universe to trace structure formation influenced by Lambda-CDM cosmology.

Observations and Data Products

Survey modes will produce calibrated imaging mosaics, slitless spectroscopic data, time-domain light curves for transient detection, and high-contrast coronagraphic frames with associated point-spread-function models. Planned data releases follow a schedule of quick-look products for transient alerts, mid-term calibrated archives hosted by Mikulski Archive for Space Telescopes-like facilities, and final value-added catalogs enabling cross-matches with Sloan Digital Sky Survey, Gaia, Two Micron All Sky Survey, and forthcoming datasets from Vera C. Rubin Observatory. Data products are expected to support community-led archival research, machine-learning classifications, and cosmological parameter inference pipelines validated against mock catalogs and instrument simulators used by teams at Space Telescope Science Institute.

Collaborations and Operations

Operations are coordinated by NASA centers in collaboration with international partners such as Canadian Space Agency contributors and European instrument teams. A science team structure includes principal investigators, instrument scientists, and working groups for cosmology, exoplanets, galaxy evolution, and community engagement, mirroring organizational patterns from the Hubble Space Telescope and Chandra X-ray Observatory programs. Ground systems integrate scheduling, downlink via NASA Deep Space Network assets, and calibration activities involving observatories like Keck Observatory and Atacama Large Millimeter/submillimeter Array for follow-up validation. Data rights and guest-observer opportunities follow peer-reviewed allocation processes similar to those used by Hubble Space Telescope and James Webb Space Telescope.

Legacy and Impact on Astronomy

The mission is poised to transform wide-field infrared astronomy by providing legacy surveys with spatial resolution rivaling earlier flagship missions over unprecedented sky areas, enabling synergies with facilities such as Vera C. Rubin Observatory, Euclid (spacecraft), and James Webb Space Telescope. Anticipated legacy outputs include precise measurements constraining dark energy models, a statistical census of cold exoplanets inaccessible to radial-velocity and transit surveys, and deep archives supporting studies of galaxy assembly across cosmic time with ties to theoretical frameworks developed at institutions such as Institute for Advanced Study and Kavli Institute for Cosmological Physics. Its coronagraph technology demonstration will inform future missions aimed at direct imaging of Earth-like planets discussed in decadal planning forums.

Category:Space telescopes Category:NASA missions Category:Infrared telescopes