Key Facts


481817 (2008 UL90) is a small asteroid with an orbit that is entirely confined within Earth's orbit. NASA JPL has classified 2008 UL90 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2008 UL90 orbits the sun every 212 days (0.58 years), coming as close as 0.43 AU and reaching as far as 0.96 AU from the sun. Based on its brightness and the way it reflects light, 2008 UL90 is probably between 0.506 to 1.133 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, very roughly comparable in size to the Golden Gate Bridge.

No Close Approaches

2008 UL90's orbit is 0.03 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.

Images and Observations

2008 UL90's orbit is determined by observations dating back to Oct. 26, 2008. It was last officially observed on Feb. 16, 2021. The IAU Minor Planet Center records 291 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2008 UL90:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 0.6951 AU
  • Eccentricity: 0.3798
  • Inclination: 24.31°
  • Longitude of Ascending Node: 81.14°
  • Argument of Periapsis: 183.65°
  • Mean Anomaly: 114.47°

Physical Characteristics

  • Diameter: ~0.654 km
  • Magnitude: 18.6

Derived Characteristics

  • Orbit Period: 212 days (0.58 years)
  • Avg. Orbit Speed: 35.67 km/s
  • Aphelion Distance: 0.96 AU
  • Perihelion Distance: 0.43 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 481817 (2008 UL90) 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of 2008 UL90 to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.