Key Facts


Isis is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Isis as potentially hazardous because its orbit does not bring it close to Earth.

Isis orbits the sun every 1,390 days (3.81 years), coming as close as 1.90 AU and reaching as far as 2.99 AU from the sun. Isis is about 111.0 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Isis has been observed. It completes a rotation on its axis every 13.59 days.

Isis's spectral type S (Tholen) / L (SMASSII) indicates that it is likely to contain magnesium silicate, aluminum, and iron silicate.

No Close Approaches

Isis's orbit is 0.90 AU from Earth's orbit at its closest point. This means that there is an very 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

Isis's orbit is determined by observations dating back to June 20, 1856. It was last officially observed on Feb. 3, 2020. The IAU Minor Planet Center records 2,886 observations used to determine its orbit.

Scientists have been able to determine this object's shape.

View asteroid Isis in 3D.

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 Isis:



   or view a random object

Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 2.442 AU
  • Eccentricity: 0.223
  • Inclination: 8.51°
  • Longitude of Ascending Node: 84.2°
  • Argument of Periapsis: 237.26°
  • Mean Anomaly: 306.81°

Physical Characteristics

  • Diameter: 110.99700 km
  • Magnitude: 7.5
  • Albedo: 0.139
  • Spectral type (Tholen): S
  • Spectral type (SMASS): L

Derived Characteristics

  • Orbit Period: 1,390 days (3.81 years)
  • Avg. Orbit Speed: 19.11 km/s
  • Aphelion Distance: 2.99 AU
  • Perihelion Distance: 1.90 AU
  • Rotation Period: 13.59 days
  • Approx. Composition: magnesium silicate, aluminum, and iron silicate.

Size Comparison

Orbit Simulation

Sky Map

The position of Isis 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.