Key Facts


Henrietta is a large asteroid that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt. NASA JPL has not classified Henrietta as potentially hazardous because its orbit does not bring it close to Earth.

Henrietta orbits the sun every 2,280 days (6.24 years), coming as close as 2.50 AU and reaching as far as 4.29 AU from the sun. Henrietta is about 95.9 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Henrietta has been observed. It completes a rotation on its axis every 7.36 hours.

Henrietta's spectral type F (Tholen) / None (SMASSII) indicates that it is likely to contain water, iron, nickel, cobalt, nitrogen, and ammonia.

No Close Approaches

Henrietta's orbit is 1.59 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

Henrietta's orbit is determined by observations dating back to May 11, 1895. It was last officially observed on May 9, 2023. The IAU Minor Planet Center records 4,721 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 Henrietta:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 3.395 AU
  • Eccentricity: 0.2622
  • Inclination: 20.85°
  • Longitude of Ascending Node: 197.03°
  • Argument of Periapsis: 103.84°
  • Mean Anomaly: 209.88°

Physical Characteristics

  • Diameter: 95.93400 km
  • Magnitude: 8.85
  • Albedo: 0.062
  • Spectral type (Tholen): F

Derived Characteristics

  • Orbit Period: 2,280 days (6.24 years)
  • Avg. Orbit Speed: 16.20 km/s
  • Aphelion Distance: 4.29 AU
  • Perihelion Distance: 2.50 AU
  • Rotation Period: 7.36 hours
  • Approx. Composition: water, iron, nickel, cobalt, nitrogen, and ammonia.

Map Comparison

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Orbit Simulation

Sky Map

The position of Henrietta 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.