Key Facts


15789 (1993 SC) is a dwarf planet whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1993 SC as potentially hazardous because its orbit does not bring it close to Earth.

1993 SC orbits the sun every 91,900 days (251.61 years), coming as close as 32.41 AU and reaching as far as 47.29 AU from the sun. 1993 SC is about 328.0 kilometers in diameter, making it one of the largest objects, comparable in size to Iceland.

No Close Approaches

1993 SC's orbit is 31.40 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 SC's orbit is determined by observations dating back to Sept. 23, 1993. It was last officially observed on Jan. 19, 2020. The IAU Minor Planet Center records 146 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 SC:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 39.85 AU
  • Eccentricity: 0.1868
  • Inclination: 5.15°
  • Longitude of Ascending Node: 354.53°
  • Argument of Periapsis: 319.41°
  • Mean Anomaly: 74.02°

Physical Characteristics

  • Diameter: 328.00000 km
  • Magnitude: 7.09
  • Albedo: 0.022

Derived Characteristics

  • Orbit Period: 91,900 days (251.61 years)
  • Avg. Orbit Speed: 4.72 km/s
  • Aphelion Distance: 47.29 AU
  • Perihelion Distance: 32.41 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 15789 (1993 SC) 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.