S/2015 (136472) 1
Makemake with moon
Adjective(s) Unknown
Orbital properties
Aphelion/apoapsis Unknown
Perihelion/periapsis Unknown
Semi-major axis 21,000 km to 300,000 km
Orbital eccentricity Unknown
Orbital period 12.4 days to 660 days
Average orbital speed Unknown
Physical properties
Radius 80 km
Mass Unknown
Mean density Unknown
Escape velocity Unknown
Rotation period Unknown
Average surface temperature Unknown
Apparent magnitude 25.1
Moons None
S/2015 (136472) 1 is the only satellite of Makemake. It was discovered in April 2015, but was confirmed as a moon on 26 April, 2016. It's reflectivity is similar to charcoal which is surprising because Makemake is the 2nd brightest object in the solar system (next to Pluto). One hypothesis to explain this is that its gravity is not strong enough to prevent bright but volatile ices from being lost to space when it is heated by the distant Sun.