Station · NORAD 25544
International Space Station. Continuously crewed since November 2000; the most-searched satellite in the CelesTrak catalog by an order of magnitude.
| Operator | NASA/Roscosmos/ESA/JAXA/CSA |
| Launched | 1998-11-20 |
| Approx. altitude | 420 km |
| Inclination | 51.6° |
| NORAD catalog id | 25544 |
The current two-line element set for this object is served from Ephem's cache at:
GET · https://ephem-api.YOUR-SUBDOMAIN.workers.dev/v1/objects/25544
curl -s https://ephem-api.YOUR-SUBDOMAIN.workers.dev/v1/objects/25544 \
-H "Authorization: Bearer ek_live_..."Cached 1 h. Backed by the CelesTrak active catalog, refreshed nightly.
ISS (Zarya) is included in the nightly SGP4 propagation that produces Ephem's debris density feed. Its sub-satellite point at any moment can be computed client-side from the TLE using standard SGP4 (the same code path the overhead map uses in your browser).