Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the island of Manhattan (3.65 km diameter)
  • Will pass within 29,221,374 km of Earth in 2051
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation


Cuno is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified Cuno as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

Cuno orbits the sun every 1,020 days (2.79 years), coming as close as 0.73 AU and reaching as far as 3.24 AU from the sun. Cuno is about 3.7 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the island of Manhattan.

The rotation of Cuno has been observed. It completes a rotation on its axis every 3.56 hours.

Cuno's spectral type None (Tholen) / Sq (SMASSII) indicates that it is likely to contain magnesium silicate and iron silicate.

Close Approaches

Cuno's orbit is 0.03 AU from Earth's orbit at its closest point. This means that there is an wide berth between this asteroid and Earth at all times.

Cuno has 11 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
June 9, 2051 29,221,374 22.117
Dec. 22, 2053 22,988,139 21.570
May 20, 2065 19,146,154 14.082
Jan. 8, 2093 12,608,695 14.869
June 3, 2104 14,677,830 18.571
May 21, 2118 19,860,487 13.903
Jan. 8, 2146 9,141,048 15.418
June 11, 2157 29,022,891 22.142
Dec. 27, 2159 18,220,611 20.607
May 28, 2171 13,705,447 15.445
Jan. 23, 2199 24,813,746 12.921

Images and Observations

Cuno's orbit is determined by observations dating back to June 5, 1959. It was last officially observed on Feb. 16, 2020. The IAU Minor Planet Center records 2,400 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 Cuno:



   or view a random object

Orbital Elements

  • Epoch: 2459200.5 JD
  • Semi-major axis: 1.983 AU
  • Eccentricity: 0.6342
  • Inclination: 6.7°
  • Longitude of Ascending Node: 294.87°
  • Argument of Periapsis: 236.35°
  • Mean Anomaly: 41.93°

Physical Characteristics

  • Diameter: 3.65100 km
  • Magnitude: 14.1
  • Albedo: 0.097
  • Spectral type (SMASS): Sq

Derived Characteristics

  • Orbit Period: 1,020 days (2.79 years)
  • Avg. Orbit Speed: 21.15 km/s
  • Aphelion Distance: 3.24 AU
  • Perihelion Distance: 0.73 AU
  • Rotation Period: 3.56 hours
  • Approx. Composition: magnesium silicate and iron silicate.

Map Comparison

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Orbit Simulation

Sky Map

The position of Cuno 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 Cuno 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.