Key Facts


Comet C/1877 G2 (Swift) is an object with a trajectory through the solar system likely originating from the Oort Cloud. NASA JPL has not classified Swift as potentially hazardous because its orbit does not bring it close to Earth.

Swift orbits the sun every days ( years), coming as close as 1.01 AU and reaching as far as -235.61 AU from the sun. Its orbit is highly elliptical.

No Close Approaches

Swift's orbit is 0.33 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

Swift's orbit is determined by observations dating back to April 15, 1877. It was last officially observed on May 17, 1877. The IAU Minor Planet Center records 9 observations used to determine its orbit.

Accessibility and Exploration

This comet is not considered a viable target for human exploration by the NHATS study.



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Orbital Elements

  • Epoch: 2406739.5 JD
  • Semi-major axis: -117.3 AU
  • Eccentricity: 1.0086
  • Inclination: 77.16°
  • Longitude of Ascending Node: 347.73°
  • Argument of Periapsis: 116.77°
  • Mean Anomaly: 0.0°

Physical Characteristics

Derived Characteristics

  • Aphelion Distance: -235.61 AU
  • Perihelion Distance: 1.01 AU

Orbit Simulation

Sky Map

The position of C/1877 G2 (Swift) 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.