2018 CN2

2018 CN₂
	The orbit before and after flyby, with positions on 1 February 2018, before flyby
Discovery
Discovered by	Mount Lemmon Srvy.
Discovery site	Mount Lemon Obs.
Discovery date	8 February 2018; (first observed only)
Designations
MPC designation	2018 CN2
Minor planet category	NEO · Apollo; Earth- and Mars crosser
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 7
Observation arc	1 day
Aphelion	1.7740 AU
Perihelion	0.6335 AU
Semi-major axis	1.2037 AU
Eccentricity	0.4738
Orbital period (sidereal)	1.32 yr (482 days)
Mean anomaly	348.58°
Mean motion	0° 44m 46.68s / day
Inclination	25.741°
Longitude of ascending node	320.21°
Argument of perihelion	276.55°
Earth MOID	7.7×10−5 AU (0.03 LD)
Physical characteristics
Mean diameter	5–16 m; 9 m (est. at 0.20); 17 m (est. at 0.057)
Absolute magnitude (H)	27.653

2018 CN₂ is a very small asteroid, classified as a near-Earth object of the Apollo group, approximately 5 to 16 meters in diameter. It was first observed by astronomers of the Mount Lemmon Survey at Mount Lemmon Observatory, Arizona, on 8 February 2018, one day prior its close encounter with Earth at 0.18 lunar distances.^[1]

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