Key Facts


1997 RX9 is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1997 RX9 as potentially hazardous because its orbit does not bring it close to Earth.

1997 RX9 orbits the sun every 98,700 days (270.23 years), coming as close as 39.58 AU and reaching as far as 44.00 AU from the sun. Based on its brightness and the way it reflects light, 1997 RX9 is probably between 58.151 to 130.029 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

1997 RX9's orbit is 38.70 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

1997 RX9's orbit is determined by observations dating back to Sept. 7, 1997. It was last officially observed on Aug. 8, 2000. The IAU Minor Planet Center records 22 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 1997 RX9:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 41.79 AU
  • Eccentricity: 0.0528
  • Inclination: 29.92°
  • Longitude of Ascending Node: 163.8°
  • Argument of Periapsis: 77.21°
  • Mean Anomaly: 128.55°

Physical Characteristics

  • Diameter: ~75.072 km
  • Magnitude: 8.3

Derived Characteristics

  • Orbit Period: 98,700 days (270.23 years)
  • Avg. Orbit Speed: 4.61 km/s
  • Aphelion Distance: 44.00 AU
  • Perihelion Distance: 39.58 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 1997 RX9 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.