WNISAT 1R

WNISAT 1R is an active satellite operated by Weathernews, Inc. (Japan), launched on 2017-07-14 from Baikonur, Kazakhstan on the Soyuz Rideshare 4 launch. It orbits in Low Earth Orbit (LEO) at altitudes between 555 km and 567 km with an inclination of 97.5°. It travels at approximately 27,299 km/h (7.58 km/s), completing one full orbit every 96 minutes — that’s roughly 15.02 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 ~3–10 years. Orbital Radar tracks WNISAT 1R in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

WNISAT 1R orbits at an average altitude of 561 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 WNISAT 1R’s average altitude, there are currently 2,216 active payloads and 436 tracked debris or rocket body fragments — notable neighbours include STARLINK-1184, STARLINK-1276, ONEWEB-0050. This makes it one of the more crowded altitude bands, containing roughly 12.4% of all active satellites. With an inclination of 97.5°, WNISAT 1R 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. Japan operates approximately 200 active satellites in total, of which 49 share a similar altitude band with WNISAT 1R.