DOORY-SAT

DOORY-SAT is an active satellite operated by Hanwha (South Korea), launched on 2023-12-04 from Jeju sea launch area, South Korea on the S-STEP launch. It orbits in Low Earth Orbit (LEO) at altitudes between 620 km and 633 km with an inclination of 47.0°. It travels at approximately 27,171 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.81 orbits per day. Its near-circular orbit (eccentricity close to zero) means it maintains a very consistent altitude throughout each revolution. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~10–25 years. Orbital Radar tracks DOORY-SAT in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

DOORY-SAT orbits at an average altitude of 627 km in the mid-LEO band, where atmospheric drag is minimal but radiation exposure remains manageable. Objects at this altitude persist for decades to centuries, making debris mitigation critical. This regime is popular for remote sensing constellations and scientific instruments that need stable, long-duration orbits. Within ±50 km of DOORY-SAT’s average altitude, there are currently 1,052 active payloads and 887 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050. This makes it one of the more crowded altitude bands, containing roughly 5.6% of all active satellites. With an inclination of 47.0°, DOORY-SAT passes over latitudes between 47.0°N and 47.0°S, covering the tropical and temperate zones where most of the world’s population resides. Low-to-mid inclination orbits are efficient to reach from equatorial and mid-latitude launch sites. South Korea operates approximately 65 active satellites in total, of which 9 share a similar altitude band with DOORY-SAT.