Key Facts


1999 CN153 is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1999 CN153 as potentially hazardous because its orbit does not bring it close to Earth.

1999 CN153 orbits the sun every 102,000 days (279.26 years), coming as close as 41.91 AU and reaching as far as 43.27 AU from the sun. Based on its brightness and the way it reflects light, 1999 CN153 is probably between 76.658 to 171.412 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

1999 CN153's orbit is 40.90 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

1999 CN153's orbit is determined by observations dating back to Feb. 11, 1999. It was last officially observed on April 8, 1999. The IAU Minor Planet Center records 6 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 1999 CN153:



   or view a random object

Orbital Elements

  • Epoch: 2451247.5 JD
  • Semi-major axis: 42.59 AU
  • Eccentricity: 0.0159
  • Inclination: 7.48°
  • Longitude of Ascending Node: 153.05°
  • Argument of Periapsis: 179.5°
  • Mean Anomaly: 180.0°

Physical Characteristics

  • Diameter: ~98.964 km
  • Magnitude: 7.7

Derived Characteristics

  • Orbit Period: 102,000 days (279.26 years)
  • Avg. Orbit Speed: 4.54 km/s
  • Aphelion Distance: 43.27 AU
  • Perihelion Distance: 41.91 AU

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of 1999 CN153 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.