Roman Space Telescope

Reference Information

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The optical reference information files have been updated to reflect the Phase C payload design. This is the design that is baselined for the Fall 2021 Critical Design Review.

The Wide-Field Instrument

» Roman Wide-Field Instrument Reference Information
A compendium of basic reference information on the Wide-Field Instrument. (Updated January 25, 2021)
View PDF | PowerPoint file


» Observatory Reference Information
A compendium of basic information on the Roman Observatory. (March 1, 2021) View PDF | PowerPoint file

» The Coronagraph Instrument - Reference Information
Information here captures the instrument design elements as of the CGI Preliminary Design Review in September 2019 (December 2019) View PDF | PowerPoint file

Point-spread Functions

» Libraries of point spread functions for the WFI imaging modes have been computed with WebbPSF. A small set, computed at the centers of SCA 1 and SCA 18 are available here ( - 28MB) to illustrate the variation from the center to one corner of the field of view.

More extensive libraries, with PSFs computed at the center of each SCA and at various locations around the boundary of the FOV are also available; these have been computed with stellar spectral energy distributions for spectral types:

Roman Effective Area

Roman Effective Area [View PDF]


» Phase B Dispersion Fits (.xlsx) This spreadsheet provides information on the dispersion for the grism and prism.

» Wide-Field Instrument Transmission (.xlsx) Contains the Effective area as a function of wavelength for each observing mode of the Wide-Field Instrument. (Parameters as of June 2021)

Additional information

» Observatory and instrument parameters is available at the IPAC site

Instrument Reference Information Archive Pages
Cycle 6 | Cycle 5

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