[astro-ph.EP] We present maps of H2O, CO2, and a 4.57 um spectral feature across Callisto’s surface observed using the James Webb Space Telescope (JWST).
![The band depths and centers of Callisto’s CO2 as measured at 4.25 µm for three viewing geometries. The trailing hemisphere and Asgard-centered data were previously published by Cartwright et al. (2024). The following geologic units are marked with symbols: Valhalla, ⋆ ; Asgard, ◦; Lofn/Heimdall, △. The sub-observer longitude of the observation is indicated in the panels. The projected angular size of Callisto varies slightly between each observation, so the spaxel scale is slightly different in each panel. The typical uncertainty in the band depth is ± 0.4%, while the band center is ±0.0006µm -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Callisto.png?resize=1200%2C709&ssl=1)
[astro-ph.EP] We present maps of H2O, CO2, and a 4.57 um spectral feature across Callisto’s surface observed using the James Webb Space Telescope (JWST).