Key Facts


2015 YY18 is a mid-sized asteroid with an orbit between Jupiter and Neptune. NASA JPL has not classified 2015 YY18 as potentially hazardous because its orbit does not bring it close to Earth.

2015 YY18 orbits the sun every 31,200 days (85.42 years), coming as close as 3.29 AU and reaching as far as 35.53 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 2015 YY18 is probably between 2.783 to 6.224 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the island of Manhattan.

No Close Approaches

2015 YY18's orbit is 2.40 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

2015 YY18's orbit is determined by observations dating back to Nov. 30, 2015. It was last officially observed on Dec. 23, 2016. The IAU Minor Planet Center records 86 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 2015 YY18:



   or view a random object

Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 19.41 AU
  • Eccentricity: 0.8307
  • Inclination: 118.24°
  • Longitude of Ascending Node: 258.15°
  • Argument of Periapsis: 147.82°
  • Mean Anomaly: 18.96°

Physical Characteristics

  • Diameter: ~3.593 km
  • Magnitude: 14.9

Derived Characteristics

  • Orbit Period: 31,200 days (85.42 years)
  • Avg. Orbit Speed: 6.77 km/s
  • Aphelion Distance: 35.53 AU
  • Perihelion Distance: 3.29 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 2015 YY18 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.