S/2015 (136472) 1
< S
Makemake and its moon S/2015 (136472) 1 (arrow) | |
| Discovery | |
|---|---|
| Discovered by |
|
| Discovery date | 27 April 2015 |
| Designations | |
| MK2 (unofficial) | |
| Orbital characteristics: 3 | |
| >21000 km | |
| Eccentricity | unknown |
| >12.4 days | |
| Inclination | 63°–87° wrt ecliptic (prograde): 3 |
| Satellite of | Makemake |
| Physical characteristics | |
| ~175 km (4% albedo; best fit): 4 175–250 km (2–4% albedo) | |
| Albedo | 0.04 (best fit): 4 0.02–0.04: 4 |
| 25.0 | |
| 7.89±0.04: 3 | |
S/2015 (136472) 1, unofficially nicknamed MK2 by the discovery team, is the only known moon of the trans-Neptunian dwarf planet Makemake. It is estimated to be 175 km (110 mi) in diameter and has a semi-major axis of at least 21,000 km (13,000 mi) from Makemake. Its orbital period is at least 12 days if it has a circular orbit. Observations leading to its discovery occurred in April 2015, using the Hubble Space Telescope's Wide Field Camera 3, and its discovery was announced on 26 April 2016.