Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to a football field
  • Will pass within 3,393,570 km of Earth in 2020
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

438908 (2009 XO) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2009 XO as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2009 XO orbits the sun every 926 days (2.54 years), coming as close as 0.85 AU and reaching as far as 2.87 AU from the sun. Based on its brightness and the way it reflects light, 2009 XO is probably between 0.211 to 0.472 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a football field.

Close Approaches

2009 XO's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.

2009 XO has 12 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
May 7, 2020 3,393,570 12.781
Jan. 4, 2048 24,121,743 17.012
March 14, 2053 21,361,496 10.119
May 20, 2058 25,195,604 17.229
Jan. 15, 2086 2,503,664 12.568
March 14, 2091 21,361,069 10.102
May 7, 2096 1,534,180 12.450
Jan. 4, 2119 29,668,780 18.147
March 29, 2124 20,148,645 9.978
Jan. 26, 2152 6,951,991 10.852
May 15, 2157 10,944,142 14.331
May 24, 2185 27,406,086 17.649

Images and Observations

2009 XO's orbit is determined by observations dating back to Dec. 9, 2009. It was last officially observed on Nov. 28, 2019. The IAU Minor Planet Center records 335 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 2009 XO:

References

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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 1.859 AU
  • Eccentricity: 0.5423
  • Inclination: 0.35°
  • Longitude of Ascending Node: 27.73°
  • Argument of Periapsis: 140.71°
  • Mean Anomaly: 25.35°

Physical Characteristics

  • Diameter: ~0.273 km
  • Magnitude: 20.5

Derived Characteristics

  • Orbit Period: 926 days (2.54 years)
  • Avg. Orbit Speed: 21.84 km/s
  • Aphelion Distance: 2.87 AU
  • Perihelion Distance: 0.85 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 438908 (2009 XO) 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.