Key Facts

Overview

Psyche is a very large asteroid circling the sun between Mars and Jupiter, inside the main asteroid belt. NASA JPL does not treat Psyche as potentially hazardous, because its orbit never carries it near Earth.

One lap around the sun takes Psyche 1,830 days (5.01 years). Over that circuit it swings between 2.53 AU and 3.32 AU from the sun, travelling at an average of 17.38 km/s. At 226.0 kilometers across, Psyche is bigger than 99% of known asteroids — roughly the size of the U.S. state of Maryland.

Psyche has been watched long enough to time its spin: one full turn on its axis takes 4.2 hours.

Its spectral type — M on the Tholen scale, X on SMASSII — suggests Psyche holds iron, nickel, and cobalt.

No Close Approaches

At their nearest, the orbits of Psyche and Earth stay 1.53 AU apart. That is a comfortable margin, and it holds at every point in the orbit.

Orbital simulations run by NASA JPL's CNEOS turn up no close approaches to Earth.

Images and Observations

The orbit of Psyche is pinned down by sightings going back to June 22, 1984, the most recent officially logged on Dec. 9, 2021. The IAU Minor Planet Center holds 2,693 observations behind that solution.

Accessibility and Exploration

The NHATS study does not rate Psyche as a realistic destination for a crewed mission.

Similar Objects

These objects follow orbits with much the same shape and tilt as Psyche:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.924 AU
  • Eccentricity: 0.1342
  • Inclination: 3.1°
  • Longitude of Ascending Node: 150.03°
  • Argument of Periapsis: 229.41°
  • Mean Anomaly: 243.16°

Physical Characteristics

  • Diameter: 226.00000 km
  • Magnitude: 6.21
  • Albedo: 0.1203
  • Spectral type (Tholen): M
  • Spectral type (SMASS): X

Derived Characteristics

  • Orbit Period: 1,830 days (5.01 years)
  • Avg. Orbit Speed: 17.38 km/s
  • Aphelion Distance: 3.32 AU
  • Perihelion Distance: 2.53 AU
  • Rotation Period: 4.2 hours
  • Approx. Composition: iron, nickel, and cobalt

Map Comparison

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Orbit Simulation

Sky Map

A ◯ pink circle marks where Psyche sits. It may fall outside your current field of view — use the controls below to change the position, location and time.