Key Facts


Comet C/1844 Y1 (Great comet) is an object whose orbit does not match any defined comet orbit class. NASA JPL has not classified Great comet as potentially hazardous because its orbit does not bring it close to Earth.

Great comet orbits the sun every days ( years), coming as close as 0.25 AU and reaching as far as 717.55 AU from the sun. Its orbit is highly elliptical.

No Close Approaches

Great comet's orbit is AU from Earth's orbit at its closest point. This means that its orbit is very close to Earth's orbit.

The orbit of Great comet brings it close to Jupiter's orbit.

Orbital simulations conducted by NASA JPL's CNEOS do not show any close approaches to Earth.

Images and Observations

Great comet's orbit is determined by observations dating back to Dec. 27, 1844. It was last officially observed on March 9, 1845. The IAU Minor Planet Center records 41 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: 2394920.5 JD
  • Semi-major axis: 358.9 AU
  • Eccentricity: 0.9993
  • Inclination: 45.57°
  • Longitude of Ascending Node: 120.59°
  • Argument of Periapsis: 177.51°
  • Mean Anomaly: 0.0°

Physical Characteristics

Derived Characteristics

  • Aphelion Distance: 717.55 AU
  • Perihelion Distance: 0.25 AU

Orbit Simulation

Sky Map

The position of C/1844 Y1 (Great comet) 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.