2011 MD
2011 MD is a bright micro-asteroid, classified as near-Earth object of the Apollo and Amor group, respectively. On 27 June 2011, at around 17:00 UTC (13:00 EDT), the object passed exceptionally close to Earth's surface at a distance of approximately 12,000 kilometers (7,500 mi), roughly the diameter of the Earth.
2011 MD imaged by Spitzer in February 2014 | |
| Discovery | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 2011 June 22 (first observed only) |
| Designations | |
MPC designation | 2011 MD |
Minor planet category | NEO · Apollo · Amor |
| Orbital characteristics | |
| Epoch 13 July 2011 (JD 2455755.5) | |
| Uncertainty parameter 2 · 0 | |
| Observation arc | 2.65 yr (967 days) |
| Aphelion | 1.1031 AU |
| Perihelion | 1.0161 AU |
Semi-major axis | 1.0596 AU |
| Eccentricity | 0.0411 |
Orbital period (sidereal) | 1.09 yr (398 days) |
Mean anomaly | 11.051° |
Mean motion | 0° 54m 13.32s / day |
| Inclination | 2.5624° |
Longitude of ascending node | 273.96° |
| 4.6748° | |
| Earth MOID | 0.0003 AU (0.1 LD) |
| Physical characteristics | |
Mean diameter | 6 m (estimate) |
Mean density | 1 g/cm3 (est. rubble pile) |
Synodic rotation period | 0.1937 h |
| 0.3 | |
| 28.0 | |
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