121 research observatories — ground, space, and beyond photons — each placed at the wavelengths it actually observes, from LHAASO at PeV energies (left edge) to LOFAR at 10 MHz (right edge), with a gravitational-wave / neutrino / cosmic-ray lane below. Click any bar for the facility's archive: which institution holds the data, how you query it, and how long it stays proprietary. Solid bars are operating; hatched bars are retired instruments whose archives remain primary data sources; dashed outlines are under construction.
One bar per observatory. Horizontal position is honest: each bar spans the wavelengths the facility's current instrument suite actually covers, on the same banded log axis the RAVEN Catalogs atlas uses, here extended to 10⁻²⁰ m so the TeV–PeV facilities get real positions instead of piling on the edge. Facilities that cross bands (Swift, SVOM, AstroSat, Hinode) cross visually. The bottom lane steps off the spectrum entirely: gravitational-wave interferometers and pulsar-timing arrays, neutrino detectors, and ultra-high-energy cosmic-ray arrays, ordered by messenger.
The unit is the observatory — Keck, not KCWI; Palomar, not ZTF — because the archive boundary almost always sits at the facility level. The drawer's payload is the data-residence block: every archive that holds the facility's data, tagged by access route, plus the default proprietary period. The tags are deliberately blunt about an uncomfortable spread: VLT data land in a queryable public archive after twelve months, while Magellan and NOEMA photons mostly never leave PI laptops, and the IACT gamma-ray collaborations are only now — via CTAO — adopting open archives at all.
This is a static snapshot, curated 2026-06-11, deliberately not live-refreshed. Instrument rosters change every semester; archive URLs and the literature references age far more slowly, and those are what this page is for. Retired facilities appear (hatched) only where their archive remains a primary data source — Spitzer, WISE/NEOWISE, Herschel, Kepler, GALEX, Arecibo's surveys. For how thoroughly each archive has been mined, see the companion Archives atlas; for the historical space-platform inventory, the Platforms atlas.
Facility description papers and archive documentation for every entry, grouped by band. Archive URLs were verified at curation time; instrument rosters reflect the 2026A semester.