SAN FRANCISCO, California, Jan. 31 -- Publications of the Astronomical Society of the Pacific, a journal that says it advances the science of astronomy and disseminates astronomical information, published research articles on the following topics in its January 2023 edition:

* JWST NIRCam Defocused Imaging: Photometric Stability Performance and How It Can Sense Mirror Tilts

* Spectroscopic Time-series Performance of JWST/NIRSpec from Commissioning Observations