EXPLORER 31 (ISIS-X)
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About This Satellite
EXPLORER 31 (ISIS-X) is a cataloged satellite tracked under NORAD ID 1806 with international designator 65098B. According to the GCAT master catalog, it was built by APL, on the DME platform, with a launch mass of about 98 kg, with a shape described as Oct Cyl. According to the TLE snapshot used when this page was generated (2026-08-18), its MEO orbit had an apogee of about 2.792 km and a perigee near 510 km, with an inclination of 79.78° and a period of roughly 119.2 minutes; at apogee its speed was about 6.11 km/s. Positions on this page are near-real-time SGP4 predictions propagated from the latest two-line element (TLE) data.
In the TLE snapshot used to generate this page, EXPLORER 31 (ISIS-X)'s apogee was 2.792 km, where its speed was about 6.11 km/s, completing about 12.1 orbits of Earth per day. Track it live on the map above or in the JOT orbital map.