SINOD-D 3

SINOD-D 3 is an active satellite operated by SRI International (United States), launched on 2015-10-08 from Vandenberg SFB, California. After 11 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Low Earth Orbit (LEO) at altitudes between 502 km and 669 km with an inclination of 64.8°. It travels at approximately 27,251 km/h (7.57 km/s), completing one full orbit every 96 minutes — that’s roughly 14.94 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~3–10 years. Orbital Radar tracks SINOD-D 3 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

SINOD-D 3 orbits at an average altitude of 586 km in the core of Low Earth Orbit, the most heavily utilised altitude band. The balance of moderate drag (limiting debris accumulation) and short signal path (enabling low-latency links and high-resolution imaging) makes this regime the default for most commercial and government missions. Within ±50 km of SINOD-D 3’s average altitude, there are currently 3,238 active payloads and 584 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3005, STARLINK-3090. This makes it one of the more crowded altitude bands, containing roughly 18.6% of all active satellites. With an inclination of 64.8°, SINOD-D 3 passes over latitudes between 64.8°N and 64.8°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. United States operates approximately 12,339 active satellites in total, of which 2,693 share a similar altitude band with SINOD-D 3.