2019 SU3

2019 SU3
Discovery
Discovered by	ATLAS-HKO
Discovery site	Haleakala Obs.
Discovery date	23 September 2019; (first observed only)
Designations
MPC designation	2019 SU3
Minor planet category	NEO · Apollo
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 2 · 3
Observation arc	28 days
Aphelion	1.1948 AU
Perihelion	0.9922 AU
Semi-major axis	1.0935 AU
Eccentricity	0.0927
Orbital period (sidereal)	1.14 yr (418 d)
Mean anomaly	257.62°
Mean motion	0° 51m 42.84s / day
Inclination	1.1621°
Longitude of ascending node	5.1182°
Argument of perihelion	322.69°
Earth MOID	0.0022 AU (0.86 LD)
Physical characteristics
Mean diameter	15 m
Absolute magnitude (H)	27.2; 27.28

2019 SU₃ is a very small near-Earth asteroid of the Apollo group, first observed by the Asteroid Terrestrial-impact Last Alert System at Haleakala Observatory on 23 September 2019. It was briefly listed on the Risk List of the European Space Agency. With a 18-day observation arc, the nominal orbit passes 0.02 AU (3,000,000 km; 1,900,000 mi) from Earth on 27 September 2084.^[2] It was removed from the Sentry Risk Table on 12 October 2019.

Based on calculations with a shorter observation arc, the asteroid could have passed very close to Earth, about 9,700 km (6,000 mi), in mid-September, 2084.^[3]^[5]^[6]^[7] According to astronomers, "Its small size of about 15 m (49 ft) would result in limited consequences even in case of impact."^[3]

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