Key Facts


15809 (1994 JS) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1994 JS as potentially hazardous because its orbit does not bring it close to Earth.

1994 JS orbits the sun every 100,000 days (273.79 years), coming as close as 33.05 AU and reaching as far as 51.51 AU from the sun. Based on its brightness and the way it reflects light, 1994 JS is probably between 78.805 to 176.214 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

1994 JS's orbit is 32.10 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

1994 JS's orbit is determined by observations dating back to April 6, 1995. It was last officially observed on June 12, 2001. The IAU Minor Planet Center records 38 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 1994 JS:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 42.28 AU
  • Eccentricity: 0.2183
  • Inclination: 14.06°
  • Longitude of Ascending Node: 56.44°
  • Argument of Periapsis: 238.15°
  • Mean Anomaly: 359.77°

Physical Characteristics

  • Diameter: ~101.737 km
  • Magnitude: 7.64

Derived Characteristics

  • Orbit Period: 100,000 days (273.79 years)
  • Avg. Orbit Speed: 4.60 km/s
  • Aphelion Distance: 51.51 AU
  • Perihelion Distance: 33.05 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 15809 (1994 JS) 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.