Key Facts

Overview

2011 UU190 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 UU190 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.

2011 UU190 orbits the sun every 385 days (1.05 years), coming as close as 1.00 AU and reaching as far as 1.07 AU from the sun. Based on its brightness and the way it reflects light, 2011 UU190 is probably between 0.004 to 0.019 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

2011 UU190's orbit is 0.01 AU from Earth's orbit at its closest point. This means that there is an wide berth between this asteroid and Earth at all times.

Orbital simulations conducted by NASA JPL's CNEOS do not show any close approaches to Earth.

NASA Sentry has assessed impact risk for 5 very close approach scenarios. Here are the top scenarios ordered by probability of impact:

Date Distance from Earth (km) Distance Error (km) Probability of Impact (%) Impact Energy (Mt)
Oct. 16, 2025 70.62 ±85.68 0.00036 0.01103
Oct. 18, 2025 3,479.64 ±560.68 0.00010 0.01102
Oct. 18, 2025 2,876.16 ±2,050.61 0.00007 0.01102
Aug. 19, 2095 6,285.18 ±80.96 0.00000 0.01105
Sept. 25, 2025 5,598.24 ±529.16 0.00000 0.01101

Images and Observations

2011 UU190's orbit is determined by observations dating back to Oct. 17, 2011. It was last officially observed on Oct. 28, 2011. The IAU Minor Planet Center records 7 observations used to determine its orbit.

Accessibility and Exploration

2011 UU190 can be reached with a journey of 450 days. This trajectory would require a delta-v of 3.715 km/s. To put this into perspective, the delta-v to launch a rocket to Low-Earth Orbit is 9.7 km/s. There are 2,551,419 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2011 UU190.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2011 UU190:

References

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Orbital Elements

  • Epoch: 2455858.5 JD
  • Semi-major axis: 1.036 AU
  • Eccentricity: 0.0337
  • Inclination: 0.2°
  • Longitude of Ascending Node: 25.59°
  • Argument of Periapsis: 31.86°
  • Mean Anomaly: 334.42°

Physical Characteristics

  • Diameter: ~0.012 km
  • Magnitude: 28.1

Derived Characteristics

  • Orbit Period: 385 days (1.05 years)
  • Avg. Orbit Speed: 29.27 km/s
  • Aphelion Distance: 1.07 AU
  • Perihelion Distance: 1.00 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 2011 UU190 is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.