2013 ET

2013 ET is a near-Earth asteroid that was first observed on March 3, 2013,^[4] six days before its closest approach to Earth. It is estimated to be around 100 meters (330 feet) wide.^[3][5] The orbit of 2001 SY₁₆₉ has been connected to 2013 ET extending the observation arc to 11 years.

2013 ET

Radar imaging of 2013 ET
Discovery[1]
Discovered by	Catalina Sky Survey
Discovery site	Mount Lemmon Obs. (first observed only)
Discovery date	March 3, 2013
Designations
MPC designation	2013 ET
Alternative designations	2001 SY169
Minor planet category	NEO · Apollo
Orbital characteristics[2]
Epoch 2020-May-31 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	11 years
Aphelion	1.6688 AU (249.65 Gm)
Perihelion	0.74228 AU (111.044 Gm)
Semi-major axis	1.2055 AU (180.34 Gm)
Eccentricity	0.38428
Orbital period (sidereal)	1.32 yr (483.49 d)
Mean anomaly	121.70°
Mean motion	0° 44m 39.048s /day[1]
Inclination	4.8515°
Longitude of ascending node	171.30°
Argument of perihelion	81.937°
Earth MOID	0.0041 AU (610,000 km)[2]
Mercury MOID	0.287 AU (42,900,000 km)[1]
Physical characteristics
Dimensions	100 m (330 ft)[3]
Absolute magnitude (H)	22.7[2]

Its closest approach to Earth was 0.0065207 AU (975,480 km; 606,140 mi) on March 9, 2013 at 12:09 UT.^[2][6] The asteroid also makes close approaches to Mars and Venus.^[2] The asteroid was imaged by Goldstone radar on March 10, 2013.^[7]

2013 ET was one of four asteroids that passed in the vicinity of Earth during one week in early March 2013.^[8] The other asteroids in this group besides 2013 ET, included 2013 EC, 2013 EC20, and 2013 EN20.^[8]

See also

• List of asteroid close approaches to Earth in 2013
• 2013 EC
• 2013 PJ10
• List of asteroid close approaches to Earth
• Near-Earth Asteroid Tracking