Makemake
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Makemake and its moon, as seen by the Hubble Space Telescope
|
|
| Discovery | |
|---|---|
| Discovered by | |
| Discovery date | March 31, 2005 |
| Designations | |
| MPC designation | (136472) Makemake |
| Pronunciation |
/ˌmækiˈmæki/, /ˌmɑːkiˈmɑːki/ or  i/ˌmɑːkeɪˈmɑːkeɪ/
|
|
Named after
|
Makemake |
| 2005 FY9 | |
|
Dwarf planet cubewano scattered-near |
|
| Adjectives | Makemakean |
| Orbital characteristics | |
| Epoch JD 2457000.5 (9 December 2014) | |
| Aphelion | 52.840 AU |
| Perihelion | 38.590 AU |
| 45.715 AU | |
| Eccentricity | 0.15586 |
| 309.09 yr (112,897 d) | |
|
Average orbital speed
|
4.419 km/s |
| 15 | |
| Inclination | 29.00685° |
| 79.3659° | |
| 297.240° | |
| Known satellites | 1 |
| Physical characteristics | |
| Dimensions |
|
|
Mean radius
|
|
| Flattening | 0.05 |
| (6.9±0.3)×106 km2 | |
| Volume | (1.7±0.1)×109 km3 |
| Mass | < 4.4 × 1021 kg |
|
Mean density
|
1.4–3.2 g/cm3 <3.05 g/cm3 |
|
Sidereal rotation period
|
7.771±0.003 h |
| Albedo | 0.81+0.03 −0.05 |
| Temperature | 32–36 K (single-terrain model) 40–44 K (two-terrain model) |
|
Spectral type
|
B−V=0.83, V−R=0.5 |
| 17.0 (opposition) | |
| −0.3 | |
Dwarf planet Makemake and its moon
|
|
| Discovery | |
|---|---|
| Discovered by |
|
| Discovery date | April 2015 |
| Designations | |
| Pronunciation | // |
| MK 2 (unofficial) | |
| Orbital characteristics | |
| 21,000 km to 300,000 km | |
| 12.4 days to 660 days | |
| Satellite of | Makemake |
| Physical characteristics | |
| Dimensions | ~175 to 250 km |
| ~0.1 | |
| 25.1 | |
Makemake (minor-planet designation 136472 Makemake) is a dwarf planet and perhaps the largest Kuiper belt object (KBO) in the classical population, with a diameter approximately two thirds that of Pluto. Makemake has one known satellite, S/2015 (136472) 1. Makemake’s extremely low average temperature, about 30 K (−243.2 °C), means its surface is covered with methane, ethane, and possibly nitrogen ices.
Makemake was discovered on March 31, 2005, by a team led by Michael E. Brown, and announced on July 29, 2005. Initially, it was known as 2005 FY9 and later given the minor-planet number 136472. Makemake was recognized as a dwarf planet by the International Astronomical Union (IAU) in July 2008. Its name derives from Makemake in the mythology of the Rapa Nui people of Easter Island.
Makemake was discovered on March 31, 2005, by a team at the Palomar Observatory, led by Michael E. Brown, and was announced to the public on July 29, 2005. The team had planned to delay announcing their discoveries of the bright objects Makemake and Eris until further observations and calculations were complete, but announced them both on July 29 when the discovery of another large object they had been tracking, Haumea, was controversially announced on July 27 by a different team in Spain.
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