Key Facts


86177 (1999 RY215) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1999 RY215 as potentially hazardous because its orbit does not bring it close to Earth.

1999 RY215 orbits the sun every 113,000 days (309.38 years), coming as close as 34.54 AU and reaching as far as 56.94 AU from the sun. Based on its brightness and the way it reflects light, 1999 RY215 is probably between 106.305 to 237.706 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Connecticut.

No Close Approaches

1999 RY215's orbit is 33.60 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

1999 RY215's orbit is determined by observations dating back to Sept. 8, 1999. It was last officially observed on Oct. 6, 2021. The IAU Minor Planet Center records 140 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 RY215:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 45.74 AU
  • Eccentricity: 0.2449
  • Inclination: 22.13°
  • Longitude of Ascending Node: 326.52°
  • Argument of Periapsis: 50.78°
  • Mean Anomaly: 354.68°

Physical Characteristics

  • Diameter: ~137.240 km
  • Magnitude: 6.99

Derived Characteristics

  • Orbit Period: 113,000 days (309.38 years)
  • Avg. Orbit Speed: 4.40 km/s
  • Aphelion Distance: 56.94 AU
  • Perihelion Distance: 34.54 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 86177 (1999 RY215) 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.