Key Facts

  • Classified as a Apollo-class Asteroid
  • Comparable in size to the U.S. Capitol building (0.42 km diameter)
  • Will pass within 23,451,167 km of Earth in 2025
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

Vishnu is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified Vishnu as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

Vishnu orbits the sun every 398 days (1.09 years), coming as close as 0.59 AU and reaching as far as 1.53 AU from the sun. Vishnu is about 0.4 kilometers in diameter, making it a small to average asteroid, comparable in size to the U.S. Capitol building.

Vishnu's spectral type (Tholen) / O (SMASSII) indicates that it is likely to contain platinum and nickel-iron.

Close Approaches

Vishnu's orbit is 0.02 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.

Vishnu has 13 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 1, 2025 23,451,167 11.980
March 28, 2037 26,868,799 11.153
Sept. 7, 2070 28,324,201 9.747
Sept. 8, 2082 24,583,701 10.200
Sept. 8, 2094 25,692,696 10.069
Sept. 9, 2106 25,599,005 10.064
Sept. 9, 2118 27,740,555 9.828
Sept. 9, 2130 27,776,530 9.808
Sept. 9, 2142 27,450,110 9.854
March 26, 2169 29,701,173 10.724
April 1, 2181 25,238,021 11.569
Aug. 31, 2189 29,088,880 19.712
April 6, 2193 21,061,151 13.099

Images and Observations

Vishnu's orbit is determined by observations dating back to Aug. 2, 1986. It was last officially observed on July 6, 2015. The IAU Minor Planet Center records 486 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 Vishnu:

References

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Orbital Elements

  • Epoch: 2455202.5 JD
  • Semi-major axis: 1.05950994113 AU
  • Eccentricity: 0.443942578038
  • Inclination: 11.1704381221°
  • Longitude of Ascending Node: 158.014074998°
  • Argument of Periapsis: 296.603078115°
  • Mean Anomaly: 62.8510943297°

Physical Characteristics

  • Diameter: 0.42000 km
  • Magnitude: 18.4
  • Albedo: 0.52
  • Spectral type (SMASS): O

Derived Characteristics

  • Orbit Period: 398 days (1.09 years)
  • Avg. Orbit Speed: 28.94 km/s
  • Aphelion Distance: 1.53 AU
  • Perihelion Distance: 0.59 AU
  • Approx. Composition: platinum and nickel-iron.

Size Comparison

Orbit Simulation

Sky Map

The position of Vishnu 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.