exosatellite

Although it is uncertain whether this exosatellite will fulfil the presently undefined criteria for qualifying as an exomoon, it is a marked step towards that first uncontroversial detection, as advancing technology will allow the same method to be applied to less massive targets.

Planetary-mass exosatellite detected around the substellar companion of a star Kevin Hoy 2026

Brown dwarfs occupy the mass regime between planets and stars. In systems containing both a star and a substellar companion (be it a brown dwarf or an exoplanet), a third object orbiting the companion can be called an exosatellite.

Planetary-mass exosatellite detected around the substellar companion of a star Kevin Hoy 2026