Documentation for WebbPSF

WebbPSF is a Python package that computes simulated point spread functions (PSFs) for NASA’s JWST and WFIRST observatories. WebbPSF transforms models of telescope and instrument optical state into PSFs, taking into account detector pixel scales, rotations, filter profiles, and point source spectra. It is not a full optical model of JWST, but rather a tool for transforming optical path difference (OPD) maps, created with some other tool, into the resulting PSFs as observed with JWST’s or WFIRST’s instruments.

Sample PSFs for JWST's instruments.

Figure 1: Sample PSFs for JWST’s instrument suite, all on the same angular scale and display stretch.

Sample PSFs for the filters in the WFIRST WFI.

Figure 2: Sample PSFs for the filters in the WFIRST WFI.

Contributors: WebbPSF has been developed by Marshall Perrin, Joseph Long, Shannon Osborne, Robel Geda, Neil Zimmerman, Marcio Melendez Hernandez, Lauren Chambers, Keira Brooks, and Anand Sivaramakrishnan, with contributions from Jarron Leisenring, Ewan Douglas, Charles Lajoie, Megan Sosey, Kathryn St.Laurent, and the developers of the astropy-helpers template framework.

Getting Started with WebbPSF

Quickstart Jupyter Notebook

This documentation is complemented by an Jupyter Notebook format quickstart tutorial. Downloading and running that notebook is a great way to get started using WebbPSF.

Note

Getting help: For help using or installing webbpsf, you can contact the STScI Help Desk, help@stsci.edu. Note that WebbPSF is included in the Astroconda python distribution, as well as being installable via standard Python packaging tools.

What’s new in the latest release?

Contents

Appendices and Reference

How to cite WebbPSF

In addition to this documentation, WebbPSF is described in the following references. Users of WebbPSF are encouraged to cite one of these.

In particular, the 2012 SPIE paper gives a broad overview, the 2014 SPIE paper presents comparisons to instrument cryotest data, and the Technical Report document describes in more detail the relevant optical physics, explains design decisions and motivation for WebbPSF’s architecture, and presents extensive validation tests demonstrating consistency between WebbPSF and other PSF simulation packages used throughout the JWST project.

Mailing List

If you would like to receive email announcements of future versions, please contact Marshall Perrin, or visit maillist.stsci.edu to subscribe yourself to the “webbpsf-users@maillist.stsci.edu” list.