2013 EC is a near-Earth asteroid that passed Earth just inside the orbit of the Moon, with its closest approach on March 4, 2013 at 07:35 UTC.^[3] 2013 EC was discovered by the Mount Lemmon Observatory in Arizona, United States, on March 2, 2013.^[4] Asteroid 2013 EC is estimated to be equal in size to the Chelyabinsk meteor that impacted on February 15, 2013. Its measurement is about 10 to 17 meters (33 to 56 ft) wide.^[5]

2013 EC

Discovery[1]
Discovered by	Mt. Lemmon Survey
Discovery site	Summerhaven, Arizona, USA
Discovery date	March 2, 2013
Designations
MPC designation	2013 EC
Alternative designations	MPO 256829
Minor planet category	Apollo NEO
Orbital characteristics[2]
Epoch 3 March 2013 (JD 2456354.5)
Uncertainty parameter 7[1]
Observation arc	1[1] d
Aphelion	3.66151 AU (547.754 Gm)
Perihelion	0.65528 AU (98.028 Gm)
Semi-major axis	2.15839 AU (322.891 Gm)
Eccentricity	0.69641
Orbital period (sidereal)	3.17 yr (1158.23 d) 3.17 yr
Mean anomaly	345.65°
Mean motion	0° 18m 35.676s /day
Inclination	6.02802°
Longitude of ascending node	342.373°
Argument of perihelion	261.34°
Earth MOID	0.00239372 AU (358,095 km)[2]
Mercury MOID	0.1939 AU (29,010,000 km)[1]
Jupiter MOID	1.45575 AU (217.777 Gm)[2]
Physical characteristics
Absolute magnitude (H)	27.8[2]

2013 EC was one of four asteroids that passed in the vicinity of Earth during one week in early March 2013.^[6] The other asteroids in this group besides 2013 EC, included 2013 ET (2.5 lunar distances), 2013 EC20, and 2013 EN20.^[6]