As a result of the ‘4th Nuri Launch Management Committee’ held at 10:30 am on the 21st, the Ministry of Science and ICT announced that there was no change in the launch time.
The government is planning to reopen the 5th Nuri Launch Management Committee around 2 pm and announce the final launch time after comprehensively reviewing the final preparations for the Nuri launch, the weather conditions, and the launch safety control situation.
Nuri is a three-stage rocket that can put 1.5 ton-class practical satellites into low-Earth orbit (600-800 km).
The Nuri came out of the projectile assembly building at 7:20 am on the 20th, one day before the launch, and was loaded into an unmanned special mobile vehicle and transferred to the launch pad at 8:45 am. After that, it was put on the launch pad at 11:30 after going through the process of preparing to stand up for the aircraft. In the afternoon of the same day, the launch preparation work, such as a confidentiality check to check that there is no possibility of clogging or leaking during the propellant charging process, was conducted at 8 pm by connecting the Nuri to the umbilical, a facility for charging power and propellant (fuel, oxidizer), etc. It lasted up to 40 minutes.
When the final time is confirmed by the launch management committee, final inspection of the launch operation and preparation for filling liquid oxygen and kerosene (kerosene) are carried out. If the launch is successful, the first stage is separated 127 seconds after launch, and the fairing (satellite protective cover) is removed after 233 seconds. After 274 seconds, the second stage will be separated, and after 967 seconds, the satellite mimetic will be separated. The success of the launch is judged by comprehensively considering the settling of the target orbit, the speed of entering the orbit, and the separation of stages. It takes about 30 minutes to see whether the satellite is separated from the target orbit and to check the data.
The Korea Aerospace Research Institute plans to track the flight trajectory and status using tracking radar and telemetry (remote data receiving equipment) at the Naro Space Center and Jeju Island Observatory, and telemetry in Palau to track the Nuri.