Key Facts


Comet C/1843 D1 (Great March comet) is an object whose orbit does not match any defined comet orbit class. NASA JPL has not classified Great March comet as potentially hazardous because its orbit does not bring it close to Earth.

Great March comet orbits the sun every 187,000 days (511.98 years), coming as close as 0.01 AU and reaching as far as 128.53 AU from the sun. Its orbit is highly elliptical.

No Close Approaches

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

Images and Observations

Great March comet's orbit is determined by observations dating back to March 5, 1843. It was last officially observed on April 19, 1843. The IAU Minor Planet Center records 200 observations used to determine its orbit.

Accessibility and Exploration

This comet 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 Great March comet:



   or view a random object

Orbital Elements

  • Epoch: 2394259.4 JD
  • Semi-major axis: 64.27 AU
  • Eccentricity: 0.9999
  • Inclination: 144.35°
  • Longitude of Ascending Node: 3.53°
  • Argument of Periapsis: 82.64°
  • Mean Anomaly: 0.0°

Physical Characteristics

Derived Characteristics

  • Orbit Period: 187,000 days (511.98 years)
  • Avg. Orbit Speed: 3.74 km/s
  • Aphelion Distance: 128.53 AU
  • Perihelion Distance: 0.01 AU

Orbit Simulation

Sky Map

The position of C/1843 D1 (Great March 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.