Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to the Golden Gate Bridge (0.79 km diameter)
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation


163899 (2003 SD220) is a small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 2003 SD220 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2003 SD220 orbits the sun every 275 days (0.75 years), coming as close as 0.65 AU and reaching as far as 1.00 AU from the sun. 2003 SD220 is about 0.8 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, comparable in size to the Golden Gate Bridge.

The rotation of 2003 SD220 has been observed. It completes a rotation on its axis every 285.00 hours.

No Close Approaches

2003 SD220's orbit is 0.02 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

2003 SD220's orbit is determined by observations dating back to Jan. 6, 2000. It was last officially observed on April 25, 2021. The IAU Minor Planet Center records 1,205 observations used to determine its orbit.

Accessibility and Exploration

2003 SD220 can be reached with a journey of 178 days. This trajectory would require a delta-v of 9.851 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 2,535 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2003 SD220.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2003 SD220:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 0.8267 AU
  • Eccentricity: 0.2106
  • Inclination: 8.51°
  • Longitude of Ascending Node: 273.91°
  • Argument of Periapsis: 326.93°
  • Mean Anomaly: 351.77°

Physical Characteristics

  • Diameter: 0.79100 km
  • Magnitude: 17.66
  • Albedo: 0.340

Derived Characteristics

  • Orbit Period: 275 days (0.75 years)
  • Avg. Orbit Speed: 32.70 km/s
  • Aphelion Distance: 1.00 AU
  • Perihelion Distance: 0.65 AU
  • Rotation Period: 285.00 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 163899 (2003 SD220) 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 2003 SD220 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.