 Highly elliptical orbit of 2018 CB, crossing those of both Mars and Earth. Positions shown for 1 January 2018, before flyby. | |
| Discovery[1] | |
|---|---|
| Discovered by | CSS |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 4 February 2018 (first observed only) |
| Designations | |
| 2018 CB | |
| NEO · Apollo[1][2] Earth- and Mars crosser | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 5 days |
| Aphelion | 1.8589 AU |
| Perihelion | 0.9582 AU |
| 1.4085 AU | |
| Eccentricity | 0.3197 |
| 1.67 yr (611 days) | |
| 10.249° | |
| 0° 35m 22.56s / day | |
| Inclination | 5.3027° |
| 320.79° | |
| 208.11° | |
| Earth MOID | 0.0004 AU (0.2 LD) |
| Physical characteristics | |
| 7 m (assumed)[3] 20 m (upper limit) | |
| >0.18 ~1 (assumed)[3] | |
| 26.0[2] | |
2018 CB is a very bright micro-asteroid, classified as a near-Earth object of the Apollo group, less than 20 meters (66 ft) in diameter. It was first observed by astronomers of the Catalina Sky Survey at Mount Lemmon Observatory, Arizona, on 4 February 2018, during its sub-lunar close encounter with Earth.[1]
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