Key Facts


15788 (1993 SB) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1993 SB as potentially hazardous because its orbit does not bring it close to Earth.

1993 SB orbits the sun every 91,200 days (249.69 years), coming as close as 26.75 AU and reaching as far as 52.57 AU from the sun. Based on its brightness and the way it reflects light, 1993 SB is probably between 68.007 to 152.069 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Delaware.

No Close Approaches

1993 SB's orbit is 25.80 AU from Earth's orbit at its closest point. This means that there is an extremely 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

1993 SB's orbit is determined by observations dating back to Aug. 15, 1994. It was last officially observed on Dec. 1, 2022. The IAU Minor Planet Center records 126 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 1993 SB:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 39.66 AU
  • Eccentricity: 0.3256
  • Inclination: 1.94°
  • Longitude of Ascending Node: 354.73°
  • Argument of Periapsis: 78.92°
  • Mean Anomaly: 1.28°

Physical Characteristics

  • Diameter: ~87.797 km
  • Magnitude: 7.96

Derived Characteristics

  • Orbit Period: 91,200 days (249.69 years)
  • Avg. Orbit Speed: 4.73 km/s
  • Aphelion Distance: 52.57 AU
  • Perihelion Distance: 26.75 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 15788 (1993 SB) 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.