Celeste is a futureLow Earth orbit Positioning Navigation Timing (LEO-PNT)^[1]satellite constellation by theEuropean Space Agency (ESA) intended to demonstrate the usefulness of LEO satellites for complementing and enhancing the services of higher orbit systems likeGalileo orEGNOS.^{[2][3][4][5][6][7][8][9][10][11][12][13]} Launch of the first two satellites is planned for late 2025.^{[14][15][16][17]}

Celeste was named afterMaria Celeste, a 17th centuryPoor Claresnun and a daughter ofGalileo Galilei.^[3]

First two satellites (Pathfinder A type), in the form of largeCubeSats,^[4] will be launched in December 2025 on aRocket Lab'sElectron launch vehicle fromLaunch Complex 1 onMāhia Peninsula,New Zealand^[17] to a quasi-polar orbit.^[6] Later, eight of the larger and more complex Pathfinder B satellites will be launched to similar orbits. The entire constellation of 10 satellites is planned to be completed in 2027.^[4][6]

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