Key Facts

  • Categorized as a Interior-Earth Asteroid
  • Comparable in size to the Golden Gate Bridge
  • Will pass within 12,108,267 km of Earth in 2027
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

481817 (2008 UL90) is a very 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 a small to average asteroid, very roughly comparable in size to the Golden Gate Bridge.

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.

2008 UL90 has 23 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Dec. 12, 2027 12,108,267 13.651
Dec. 17, 2034 23,113,284 14.144
Dec. 11, 2038 20,655,358 14.645
Dec. 16, 2045 14,575,560 13.329
Dec. 11, 2049 29,462,308 15.974
Dec. 14, 2056 7,523,435 12.994
Dec. 14, 2067 4,280,703 12.982
Dec. 13, 2078 4,044,562 13.031
Dec. 13, 2089 6,058,412 13.181
Dec. 12, 2100 12,536,278 13.723
Dec. 19, 2107 22,802,165 14.071
Dec. 13, 2111 21,200,363 14.760
Dec. 17, 2118 14,321,986 13.288
Dec. 13, 2122 29,812,556 16.079
Dec. 15, 2129 7,285,859 12.981
Dec. 14, 2140 4,273,798 12.986
Dec. 15, 2151 4,150,382 13.048
Dec. 14, 2162 6,728,281 13.245
Dec. 19, 2169 29,866,751 14.963
Dec. 13, 2173 13,689,781 13.876
Dec. 18, 2180 21,471,039 13.885
Dec. 12, 2184 22,422,541 14.977
Dec. 17, 2191 13,073,963 13.189

Images and Observations

2008 UL90's orbit is determined by observations dating back to Oct. 26, 2008. It was last officially observed on Dec. 4, 2019. The IAU Minor Planet Center records 266 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:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 0.695 AU
  • Eccentricity: 0.3799
  • Inclination: 24.31°
  • Longitude of Ascending Node: 81.14°
  • Argument of Periapsis: 183.64°
  • Mean Anomaly: 200.57°

Physical Characteristics

  • Diameter: ~0.654 km
  • Magnitude: 18.6

Derived Characteristics

  • Orbit Period: 212 days (0.58 years)
  • Avg. Orbit Speed: 35.66 km/s
  • Aphelion Distance: 0.96 AU
  • Perihelion Distance: 0.43 AU

Size Comparison

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.