Orbit and positions of 2018 LA, 30 days before collision
Discovery [1][2]
Discovered by
Mount Lemmon Srvy. Richard Kowalski [3]
Discovery site
Mount Lemmon Obs.
Discovery date
2 June 2018
Designations
MPC designation
2018 LA
Alternative designations
ZLAF9B2 (NEOCP)
Minor planet category
NEO · Apollo [1][4]
Orbital characteristics [4][5]
Epoch 2 June 2018 (JD 2458271.5)
Uncertainty parameter 8[4]· 6[1]
Observation arc
3.8 hours (14 obs.)
Aphelion
1.9709 AU
Perihelion
0.7820 AU
Semi-major axis
1.3764 AU
Eccentricity
0.4319
Orbital period (sidereal)
1.61 yr (590 d)
Mean anomaly
326.73°
Mean motion
0° 36m 37.08s / day
Inclination
4.2975°
Longitude of ascending node
71.870°
Time of perihelion
2018-Jul-26
Argument of perihelion
256.05°
Earth MOID
< 5000 km
Venus MOID
0.0557 AU
Mars MOID
0.0191 AU
Physical characteristics
Mean diameter
1.6–5.2 m (5.2–17.1 ft) (est. 0.05–0.3) 2.6–3.8 m (8.5–12.5 ft) (est. impact energy)
Mass
25–35 t (55,000–77,000 lbs.)
Geometric albedo
0.15–0.30 (est. impact size)
Apparent magnitude
18.3 (at discovery)
Absolute magnitude (H)
30.554[4] 30.6[1]
2018 LA, also known as ZLAF9B2, was a small Apollo near-Earth asteroid 2.6–3.8 m (9–12 ft) in mean diameter that impacted the atmosphere with small fragments reaching the Earth at roughly 16:44 UTC (18:44 local time) on 2 June 2018 near the border of Botswana and South Africa. It had been discovered only 8 hours earlier by the Mount Lemmon Survey, Arizona and based on 1+1⁄2 hours of observations, was calculated to have a roughly 85% chance of impact[6] likely somewhere between Australia and Madagascar.[7]
Hours later, a report arrived to the American Meteor Society that an observer from Botswana had seen a bright fireball. Shortly after the impact, the Asteroid Terrestrial-impact Last Alert System (ATLAS) released observations obtained from Hawaii roughly 2 hours after the Mount Lemmon observations which confirmed that the asteroid had indeed impacted Earth on a grazing path as per the observed fireball. A preliminary analysis of the pre-impact evolution of this meteoroid suggests that it may be part of a dynamical grouping.[8][9][10]
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^"Archived copy". Archived from the original on 16 September 2020. Retrieved 3 June 2018.{{cite web}}: CS1 maint: archived copy as title (link)
^de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (18 June 2018). "On the Pre-impact Orbital Evolution of 2018 LA, Parent Body of the Bright Fireball Observed Over Botswana on 2018 June 2". Research Notes of the AAS. 2 (2): 57. arXiv:1806.05164. Bibcode:2018RNAAS...2...57D. doi:10.3847/2515-5172/aacc71. S2CID 242099557.
^de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (26 July 2018). "Pre-airburst Orbital Evolution of Earth's Impactor 2018 LA: An Update". Research Notes of the AAS. 2 (3): 131. arXiv:1807.08322. Bibcode:2018RNAAS...2..131D. doi:10.3847/2515-5172/aad551. S2CID 240381194.
^de la Fuente Marcos, C.; de la Fuente Marcos, R. (2019). "Waiting to make an impact: A probable excess of near-Earth asteroids in 2018 LA-like orbits". Astronomy and Astrophysics. 621: A137 (7 pp.). arXiv:1811.11845. Bibcode:2019A&A...621A.137D. doi:10.1051/0004-6361/201834313. S2CID 239287807.
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