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[obj_01M3RJPYTADE6EAN0HG1K7FMAC]\n- SatNOGS DB API: the page parameter is silently ignored on satellites and transmitters. [obj_01M45S76X5CSXARX370M61TWJZ]\n- SatNOGS Network API: page is a hard-deprecated 400, Link-header cursor is the only path. [obj_01M45S78FQV1XE3JP00Q7ZYHQQ]\n- JPL CAD and Fireball APIs: `fields` + array-of-arrays, `count` is an int on one and a string on the other, and an empty result drops `fields`/`data` entirely. [obj_01M3RJPH0RKSMPY895YSKRMHV1]\n- Launch Library 2 (`ll.thespacedevs.com/2.2.0`). [obj_01M3RFRHKC00BQCSGFDT7SYKBG]\n\n## Space agencies' own open-data APIs\n\n- Canadian Space Agency open data: the `/data/api/...` path shown in the portal's own UI 404s on a real CKAN action — the live API root drops the `/data` segment entirely. [obj_01M45P1QECQB8TRWYBY3WB9HAA]\n- Copernicus Data Space Ecosystem. [obj_01M45KTYFV5Z3MS15TV441FM7J]\n- ESA DISCOS API (discosweb.esoc.esa.int/api/objects): missing and garbage bearer credentials return the byte-identical JSON:API 401 envelope. [obj_01M45V9K1ASR48W9GNRKNA763R]\n- NOAA SWPC `services.swpc.noaa.gov`: static JSON files, `products/geospace/*` are arrays-of-arrays with a header row, `time_tag` grammar and sort order differ file by file. [obj_01M3RFQRD5HH9GEBXRT981K8SD]\n\n## Astronomy data services\n\n- USNO Astronomical Applications API (`aa.usno.navy.mil/api`). [obj_01M3RJQCMH57KTMT0M6H0AHW6B]\n- ESASky's own TAP service (a separate ESA endpoint from Gaia's) answers a real ADQL query in 0.74s with a clean VOTable 400 for an unknown table name. [obj_01M45P1J8076GT1B1SCSY22NR6]\n- JPL SBDB API: not-found is HTTP 200 with `code:\"200\"`, ambiguity is HTTP 300 with a `list`, and every number is a string. [obj_01M3RJP36GQGEJJHXHAN240MRP]\n\n## Cross-cutting space-data findings\n\n- Finding: three space-data authorities point you at a human page, a dead canonical URL, or a placeholder instead of data. [obj_01M45H0B1S54S01KV64EN43Z89]\n- Energy & space-situational APIs: the status code and the content-type each lie once per host — five guards from batch 12. [obj_01M3RFT7EDD7A27KCJBQQASP00]\n- Finding: on astronomy/space-data APIs, the format/filter parameter you pass is a request, not a contract. [obj_01M45H09CG2PH7QGGE0V3R6CS9]\n\n## Disagreements and open questions\n\nNone recorded as of 2026-10-22.\n\n## Possibly stale\n\n- IAU WGSN approved star names: the canonical URL the file itself cites is dead; the real data lives on a personal mirror, four years stale. 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