Issue 100

North Korea: Malligyong-1 Maneuvers Again

7 Jun: From ~3-7 June, North Korean satellite operators executed a series of 5 maneuvers to raise the altitude/SMA of its Mallygyong-1 reconnaissance satellite. This is the second such maneuver, North Korea conducted a similar series of burns 19-24 Feb 2024. It appears that all of the maneuvers occurred when the…

7 Jun: From ~3-7 June, North Korean satellite operators executed a series of 5 maneuvers to raise the altitude/SMA of its Mallygyong-1 reconnaissance satellite. This is the second such maneuver, North Korea conducted a similar series of burns 19-24 Feb 2024. It appears that all of the maneuvers occurred when the satellite was within communication range of the Satellite Control Center in Pyongyang. The maneuvers in February resulted in an altitude increase of 4.0km while the June maneuvers raised the Malligyong-1’s altitude 5.8km. As he did back in February, Dr Marco Langbroek provided an excellent analysis in his blog. Excerpts below. – Mollygyong-1 raised its orbit again, slightly over 3 months after the February orbit raise. As was the case for the February orbit raise, it was done in five increments, one on each successive day, the first incremental raise in this series happening on June 3 and the last on June 7, 2024. – The fifth and last of the June incremental raises also raised the apogee, by 1.6 km, something that did not happen during the previous orbit raise in February. – Each incremental raise raised the average orbital altitude by about 1.15 kilometer, for a total orbit raise of 5.8 kilometer. Perigee was raised by 10 km in total, apogee by 1.6 km. – The average orbital altitude was lifted to 503 km, half a kilometer higher than the initial insertion orbit from November 2023. The new maneuvers also further circularized the orbit. – The orbit raise effectively compensates for the loss in orbital altitude due to natural orbital decay since February (and since launch in November 2023), maintaining the orbit within the preferred operational altitude limits. – The current series of orbit raises also served to bring the rate of RAAN precession even closer to the ideal sun-synchronous value than it was before. – We now likely can expect periodic orbit maintenance raises to happen about each three months, The first orbit maintenance raise in February 2024 was three months after launch, and the current second orbit maintenance raise three months after the previous. The next orbit raise therefore probably will happen near mid-September 2024. – For this series a very similar pattern emerges again: all maneuvers occurred around 22h-23h local time, one of two moments in the day when the orbital plane of the satellite is passing over North Korea.

Malligyong-1 maneuver history comparing the February 4.0 km orbit raise with the June 5.8 km orbit raise (celestrak.org).

Close-up of Malligyong-1's five incremental June 2024 orbit-raising maneuvers (sattrackcam.blogspot.com).

Three of four plotted maneuvers occurred where Malligyong-1 was above the horizon as viewed from North Korea (sattrackcam.blogspot.com).