Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the Golden Gate Bridge (0.76 km diameter)
  • Will pass within 29,844,172 km of Earth in 2026
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation


88710 (2001 SL9) is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2001 SL9 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.

2001 SL9 orbits the sun every 399 days (1.09 years), coming as close as 0.77 AU and reaching as far as 1.35 AU from the sun. 2001 SL9 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 2001 SL9 has been observed. It completes a rotation on its axis every 2.40 hours.

Close Approaches

2001 SL9's orbit is 0.20 AU from Earth's orbit at its closest point. This means that there is a wide berth between this asteroid and Earth at all times.

2001 SL9 has 2 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 26, 2026 29,844,172 14.789
April 17, 2084 29,813,127 14.697

Images and Observations

2001 SL9's orbit is determined by observations dating back to Nov. 27, 1954. It was last officially observed on Feb. 16, 2016. The IAU Minor Planet Center records 1,016 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 2001 SL9:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 1.061 AU
  • Eccentricity: 0.2701
  • Inclination: 21.9°
  • Longitude of Ascending Node: 202.83°
  • Argument of Periapsis: 329.36°
  • Mean Anomaly: 242.31°

Physical Characteristics

  • Diameter: 0.76000 km
  • Magnitude: 17.69
  • Albedo: 0.281

Derived Characteristics

  • Orbit Period: 399 days (1.09 years)
  • Avg. Orbit Speed: 28.93 km/s
  • Aphelion Distance: 1.35 AU
  • Perihelion Distance: 0.77 AU
  • Rotation Period: 2.40 hours

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of 88710 (2001 SL9) 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 2001 SL9 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.