2018 UA is a small near-Earth Apollo asteroid that flew very close to the earth on 19 October 2018. It was discovered about 90 minutes before closest approach. After A106fgF, it was probably the second closest non-impacting approach of an asteroid in 2018.

2018 UA

The 10 minute motion of 2018 UA past the earth on 19 October 2018
Discovery
Discovery date	19 October 2018
Designations
MPC designation	2018 UA
Orbital characteristics
Aphelion	2.010531 AU
Perihelion	0.768136 AU
Semi-major axis	1.38933 AU
Eccentricity	0.447119
Orbital period (sidereal)	1.64 yr (598.15 d)
Mean anomaly	83.09092°
Mean motion	0° 36m 6.69s / day
Inclination	2.63971°
Longitude of ascending node	205.68400°
Argument of perihelion	255.21993°
Earth MOID	0.000186 AU
Physical characteristics
Absolute magnitude (H)	30.158

External links

• Asteroid 2018 UA flew past Earth at 0.04 LD, 4th closest on record
• Truck-size asteroid makes fourth-closest pass by Earth on record
• Small asteroid passed closer than TV satellites
• MPEC 2018-U19 : 2018 UA Minor Planet Center
• 2018 UA at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2018 UA at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2018 UA at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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