not for public consumption
Working tools, one-off scripts, and explorations that aren't polished enough for the main site. Nothing here is linked from anywhere public — bookmark the URL.
Interactive SED viewer — overlay redshifted spectral features against JWST/HST/ground filter curves to check line coverage at a given z.
Rest↔observed wavelength converter, an emission-line glossary with mechanism/origin, and a flux→AB/UV magnitude calculator — all sharing one redshift.
Convert arcsec ↔ kpc at a given redshift via the angular-diameter distance, with adjustable flat-ΛCDM cosmology and JWST/HST pixel-scale presets.