OBJECT D

OBJECT D (NORAD ID 56746) is a space object catalogued under South Korea, launched on 2023-05-25 from Naro Space Center, South Korea on the NEXTSAT-2 launch. Independent catalogue analysis identifies this object as Doyosaet 1, attributed to KASI. It orbits in Low Earth Orbit (LEO) at altitudes between 245 km and 249 km with an inclination of 97.5°. It travels at approximately 27,939 km/h (7.76 km/s), completing one full orbit every 89 minutes — that’s roughly 16.13 orbits per day. Its near-polar, sun-synchronous orbit means it passes over any given point on Earth at approximately the same local solar time, ideal for consistent Earth observation lighting conditions. 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 weeks to months. Orbital Radar tracks OBJECT D in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

OBJECT D orbits at an average altitude of 247 km in a sun-synchronous orbit (SSO), a specialised subset of LEO where the orbital plane precesses to maintain a constant angle relative to the Sun. This provides consistent lighting conditions on every pass — essential for Earth observation, weather monitoring and environmental science. Within ±50 km of OBJECT D’s average altitude, there are currently 66 active payloads and 9 tracked debris or rocket body fragments — notable neighbours include STARLINK-1068, STARLINK-1171, STARLINK-1305. This is a relatively sparse altitude band, containing less than 1% of all active satellites. With an inclination of 97.5°, OBJECT D passes over latitudes between 97.5°N and 97.5°S, providing near-global coverage including the polar regions. Polar and near-polar orbits are used for reconnaissance, weather monitoring and Earth-observation missions that need to image every part of the planet. South Korea operates approximately 56 active satellites in total.