Tidally detached exomoons, also known asorphaned exomoons^[1] orploonets,^[2] are hypotheticalexoplanets that were formerlyexomoons of another planet, before being ejected from their orbits around their parent planets bytidal forces duringplanetary migration, and becoming planets in their own right.^[3][4] As of 2026, no tidally detached moons have yet been definitively detected, but they are believed to be likely to exist around other stars, and potentially detectable byphotometric methods. Researchers atColumbia University have suggested that a disrupting detached exomoon may be causing the unusual fluctuations in brightness exhibited byTabby's Star.^[5]

The termploonet, a blend of the wordsplanet andmoon,^[6][7] was first used in a 2019 paper in theMonthly Notices of the Royal Astronomical Society.^[2][8] It received attention from mainstream media sources,^[2][9][10] withCNET calling it "charmingly goofy".^[11]

• Subsatellite – Satellite that orbits a natural satellite
• Rogue planet – Planet not gravitationally bound to a star
• Rogue black hole – Interstellar or intergalactic object
• Exoplanet – Planet outside of the Solar System
• Exomoon – Moon beyond the Solar System
• Kozai mechanism – Phenomenon affecting the orbit of a binary system
• Poynting–Robertson effect – Process whereby solar radiation causes orbiting dust grains to lose angular momentum

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