Key Facts

Overview

8278 (1991 JJ) is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified 1991 JJ as potentially hazardous because its orbit does not bring it close to Earth.

1991 JJ orbits the sun every 1,530 days (4.19 years), coming as close as 2.26 AU and reaching as far as 2.92 AU from the sun. 1991 JJ is about 9.6 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.

The rotation of 1991 JJ has been observed. It completes a rotation on its axis every 75.03 hours.

No Close Approaches

1991 JJ's orbit is 1.26 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

1991 JJ's orbit is determined by observations dating back to Oct. 28, 1976. It was last officially observed on April 8, 2023. The IAU Minor Planet Center records 3,918 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 1991 JJ:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.593 AU
  • Eccentricity: 0.1267
  • Inclination: 14.11°
  • Longitude of Ascending Node: 62.34°
  • Argument of Periapsis: 165.07°
  • Mean Anomaly: 268.66°

Physical Characteristics

  • Diameter: 9.57600 km
  • Magnitude: 12.45
  • Albedo: 0.278

Derived Characteristics

  • Orbit Period: 1,530 days (4.19 years)
  • Avg. Orbit Speed: 18.44 km/s
  • Aphelion Distance: 2.92 AU
  • Perihelion Distance: 2.26 AU
  • Rotation Period: 75.03 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 8278 (1991 JJ) 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.