Key Facts


24835 (1995 SM55) is a dwarf planet whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1995 SM55 as potentially hazardous because its orbit does not bring it close to Earth.

1995 SM55 orbits the sun every 99,700 days (272.96 years), coming as close as 37.48 AU and reaching as far as 46.68 AU from the sun. Based on its brightness and the way it reflects light, 1995 SM55 is probably between 312.288 to 698.297 kilometers in diameter, making it one of the largest objects, very roughly comparable in size to the U.S. state of Iowa.

The rotation of 1995 SM55 has been observed. It completes a rotation on its axis every 8.08 hours.

No Close Approaches

1995 SM55's orbit is 36.60 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

1995 SM55's orbit is determined by observations dating back to Sept. 16, 1982. It was last officially observed on Jan. 20, 2023. The IAU Minor Planet Center records 324 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 1995 SM55:



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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 42.08 AU
  • Eccentricity: 0.1094
  • Inclination: 26.99°
  • Longitude of Ascending Node: 20.91°
  • Argument of Periapsis: 69.18°
  • Mean Anomaly: 340.8°

Physical Characteristics

  • Diameter: ~403.162 km
  • Magnitude: 4.65

Derived Characteristics

  • Orbit Period: 99,700 days (272.96 years)
  • Avg. Orbit Speed: 4.59 km/s
  • Aphelion Distance: 46.68 AU
  • Perihelion Distance: 37.48 AU
  • Rotation Period: 8.08 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 24835 (1995 SM55) 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.