(307261) 2002 MS4
| Discovery | |
|---|---|
| Discovered by |
Chad Trujillo, Michael E. Brown |
| Discovery date | 18 June 2002 |
| Designations | |
| MPC designation | 2002 MS4 |
| none | |
|
Cubewano (MPC) ScatExt (DES) |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 20569 days (56.31 yr) |
| Aphelion | 47.740 AU (7.1418 Tm) |
| Perihelion | 35.694 AU (5.3397 Tm) |
| 41.717 AU (6.2408 Tm) | |
| Eccentricity | 0.14439 |
| 269.45 yr (98415.8 d) | |
|
Average orbital speed
|
4.58 km/s |
| 216.187° | |
| 0° 0m 13.168s / day | |
| Inclination | 17.677° |
| 215.963° | |
| 215.534° | |
| Earth MOID | 34.7228 AU (5.19446 Tm) |
| Jupiter MOID | 30.7148 AU (4.59487 Tm) |
| Jupiter Tisserand parameter | 5.464 |
| Physical characteristics | |
| Dimensions | 934±47 km |
|
0.051+0.036 −0.022 |
|
| Temperature | ≈ 43 K |
| B−V=0.69; V−R=0.38 |
|
| 20.6 | |
| 3.7 3.5±0.4 (R-band) |
|
(307261) 2002 MS4 is a large classical Kuiper belt object, the second-largest known object in the Solar System without a name, after 2007 OR10. It was discovered in 2002 by Chad Trujillo and Michael Brown.
Brown's website lists it as nearly certain to be a dwarf planet. The Spitzer Space Telescope estimated it to have a diameter of 726±123 km. The Herschel team estimates it to be 934±47 km, which would make it one of the 10 largest TNOs currently known and large enough to be considered a dwarf planet under the 2006 draft proposal of the IAU. It is currently 47.2 AU from the Sun and will come to perihelion in 2123.
It has been observed 55 times, with precovery images back to 1954.
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