Extrasolar Moon - Nomenclature

Nomenclature

At present, the International Astronomical Union has not yet elaborated any specific nomenclature for this category of objects. Some propose the idea of using Roman numerals. After the official designation of the exoplanet would be included a number written in Roman numerals. So, a hypothetical extrasolar moon orbiting Gliese 581 c would be named Gliese 581 cI, a second one Gliese 581 cII.