2018 CB

2018 CB
	Highly elliptical orbit of 2018 CB, crossing those of both Mars and Earth. Positions shown for 1 January 2018, before flyby.
Discovery
Discovered by	CSS
Discovery site	Mount Lemmon Obs.
Discovery date	4 February 2018; (first observed only)
Designations
MPC designation	2018 CB
Minor planet category	NEO · Apollo; Earth- and Mars crosser
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 2
Observation arc	5 days
Aphelion	1.8589 AU
Perihelion	0.9582 AU
Semi-major axis	1.4085 AU
Eccentricity	0.3197
Orbital period (sidereal)	1.67 yr (611 days)
Mean anomaly	10.249°
Mean motion	0° 35m 22.56s / day
Inclination	5.3027°
Longitude of ascending node	320.79°
Argument of perihelion	208.11°
Earth MOID	0.0004 AU (0.2 LD)
Physical characteristics
Mean diameter	7 m (assumed); 20 m (upper limit)
Geometric albedo	>0.18; ~1 (assumed)
Absolute magnitude (H)	26.0

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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