Key Facts


39774 (1997 GO27) is a small asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified 1997 GO27 as potentially hazardous because its orbit does not bring it close to Earth.

1997 GO27 orbits the sun every 619 days (1.69 years), coming as close as 1.32 AU and reaching as far as 1.52 AU from the sun. Based on its brightness and the way it reflects light, 1997 GO27 is probably between 0.566 to 1.265 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, very roughly comparable in size to the Golden Gate Bridge.

No Close Approaches

1997 GO27's orbit is 0.34 AU from Earth's orbit at its closest point. This means that there is an 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

1997 GO27's orbit is determined by observations dating back to April 12, 1997. It was last officially observed on July 10, 2021. The IAU Minor Planet Center records 558 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 1997 GO27:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 1.421 AU
  • Eccentricity: 0.0711
  • Inclination: 17.9°
  • Longitude of Ascending Node: 188.83°
  • Argument of Periapsis: 139.36°
  • Mean Anomaly: 351.0°

Physical Characteristics

  • Diameter: ~0.730 km
  • Magnitude: 18.36

Derived Characteristics

  • Orbit Period: 619 days (1.69 years)
  • Avg. Orbit Speed: 24.97 km/s
  • Aphelion Distance: 1.52 AU
  • Perihelion Distance: 1.32 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 39774 (1997 GO27) 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of 1997 GO27 to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.