Key Facts


25D/Neujmin 2 is a large comet whose orbit features a relatively short period, low inclination, and is controlled by Jupiter's gravitational effects. NASA JPL has not classified 25D/Neujmin 2 as potentially hazardous because its orbit does not bring it close to Earth.

25D/Neujmin 2 orbits the sun every 1,980 days (5.42 years), coming as close as 1.34 AU and reaching as far as 4.84 AU from the sun. Based on its brightness and the way it reflects light, 25D/Neujmin 2 is probably between 2658.000 to 5943.469 kilometers in diameter, making it the largest asteroid/dwarf planet, very roughly comparable in size to the U.S. state of Alaska.

No Close Approaches

25D/Neujmin 2's orbit is 0.35 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

25D/Neujmin 2's orbit is determined by observations dating back to March 5, 1916. It was last officially observed on Feb. 10, 1927. The IAU Minor Planet Center records 55 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 25D/Neujmin 2:



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Orbital Elements

  • Epoch: 2424960.5 JD
  • Semi-major axis: 3.089 AU
  • Eccentricity: 0.5668
  • Inclination: 10.64°
  • Longitude of Ascending Node: 328.72°
  • Argument of Periapsis: 193.7°
  • Mean Anomaly: 11.58°

Physical Characteristics

  • Diameter: ~3431.463 km
  • Magnitude: 12.5

Derived Characteristics

  • Orbit Period: 1,980 days (5.42 years)
  • Avg. Orbit Speed: 16.97 km/s
  • Aphelion Distance: 4.84 AU
  • Perihelion Distance: 1.34 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 25D/Neujmin 2 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.