(4953) 1990 MU
(4953) 1990 MU (prov. designation: 1990 MU) is a large Earth-crossing asteroid (ECA) belonging to the Apollo group of near-Earth objects which also cross the orbits of Mars and Venus. At approximately 3 km in diameter, it is one of the largest known ECAs. It has been assigned a permanent number from the Minor Planet Center (4953) indicating that its orbit has been very well determined. With an observation arc of 45 years, the asteroid's trajectory and uncertainty regions are well known through to the year 2186.
Orbit of asteroid (4953) 1990 MU viewed from the north ecliptic pole at the epoch of 1 January 2010 | |
| Discovery | |
|---|---|
| Discovered by | Robert H. McNaught |
| Discovery site | Siding Spring Obs |
| Discovery date | 23 June 1990 |
| Designations | |
MPC designation | (4953) 1990 MU |
Minor planet category | NEO · Apollo · PHA |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.16 yr (15032 days) |
| Earliest precovery date | 21 July 1974 (Siding Spring Observatory) |
| Aphelion | 2.6874 AU (402.03 Gm) |
| Perihelion | 0.55508 AU (83.039 Gm) |
Semi-major axis | 1.6212 AU (242.53 Gm) |
| Eccentricity | 0.65762 |
Orbital period (sidereal) | 2.06 yr (754.00 d) |
Average orbital speed | .4774 deg/day |
Mean anomaly | 197.22° |
Mean motion | 0.47746°/day |
| Inclination | 24.388° |
Longitude of ascending node | 77.737° |
| 77.748° | |
| Earth MOID | 0.0256049 AU (3,830,440 km) |
| Physical characteristics | |
Mean diameter | 2.8 km |
Synodic rotation period | 14.218 h |
| 14.1 | |
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