Launch and Early Orbit phase
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In spacecraft operations, Launch and Early Orbit Phase (LEOP) is one of the most critical phases of a mission. Spacecraft operations engineers take control of the satellite after it separates from the launch vehicle. LEOP generally concludes once the satellite is safely positioned in its final orbit. During this period, operations staff work typically 24 hours a day to activate, monitor and control the various subsystems of the satellite, including the deployment of any satellite appendages (such as antennas, solar arrays, reflectors, and radiators), and undertake critical orbit and attitude control manoeuvres. Extra support staff are typically on hand and on-call during LEOP, relative to staffing during normal operations.[1][2][3][4][5]
For geostationary satellites, the launch vehicle typically carries the spacecraft to Geostationary Transfer Orbit, or GTO. From this elliptical orbit, the LEOP generally includes a sequence of apogee engine firings to reach the circular geostationary orbit.[citation needed]
For some spacecraft like the Intuitive Machines Nova-C lunar lander, initial commissioning is performed autonomously.[6]
See also
[edit]References
[edit]- ↑ "Launch and early orbit phase". www.esa.int. Retrieved 2025-10-06.
- ↑ "Biomass completes a relay race of a LEOP". www.esa.int. Retrieved 2025-10-06.
- ↑ "Nonstop LEOP full stop". www.esa.int. Retrieved 2025-10-06.
- ↑ "GRACE-FO Launch Press Kit | Launch Events and Mission Phases". www.jpl.nasa.gov. Archived from the original on 2025-03-16. Retrieved 2025-10-06.
- ↑ "EUSPA oversees the Launch and Early Orbit Phase (LEOP) of Galileo Satellite Mission | EU Agency for the Space Programme". www.euspa.europa.eu. 2024-04-28. Retrieved 2025-10-06.
- ↑ Sheetz, Michael (15 Feb 2024). "Moon company Intuitive Machines begins first mission after SpaceX launch". CNBC.