2020 OY4

2020 OY₄ is a very small asteroid classified as a near-Earth object that passed within 21,850 miles (35,160 km) of the surface of Earth on July 28, 2020, with a fly-by speed of 12.4 kilometres (7.7 mi) per second.^[3] The car-sized asteroid posed no risk of impact to Earth, but it did pass within the orbit of satellites in the geostationary ring at 35,785 kilometres (22,236 mi) above Earth's equator.^[4]

2020 OY₄

Discovery[1][2]
Discovered by	MLS
Discovery site	Mount Lemmon Obs.
Discovery date	July 26, 2020
Designations
MPC designation	2020 OY4
Minor planet category	NEO · Apollo[1][2]
Orbital characteristics[2]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 6[2] · 7[1]
Observation arc	2 days
Aphelion	1.5623 AU
Perihelion	0.6873 AU
Semi-major axis	1.1248 AU
Eccentricity	0.3889
Orbital period (sidereal)	1.19 yr (436 d)
Mean anomaly	257.94°
Mean motion	0° 49m 34.32s / day
Inclination	2.1148°
Longitude of ascending node	305.50°
Argument of perihelion	98.703°
Earth MOID	0.0000879 AU (0.034 LD)
Physical characteristics
Mean diameter	2–5 m[3]
Absolute magnitude (H)	30.18[2] 30.35[1]

The asteroid was discovered July 26, 2020 using the Mount Lemmon Survey telescope in the Santa Catalina Mountains northeast of Tucson, Arizona.^[3] The next encounter closer than the Moon is predicted to occur July 30, 2055 at a distance of 200,000 kilometres (124,000 mi) or more.^[2]