Key Facts

  • Classified as a Apollo-class Asteroid
  • Comparable in size to Mount Everest (1.60 km diameter)
  • Will pass within 21,755,205 km of Earth in 2021
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

7822 (1991 CS) is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1991 CS as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1991 CS orbits the sun every 435 days (1.19 years), coming as close as 0.94 AU and reaching as far as 1.31 AU from the sun. 1991 CS is about 1.6 kilometers in diameter, making it larger than most asteroids, comparable in size to Mount Everest.

The rotation of 1991 CS has been observed. It completes a rotation on its axis every 2.39 days.

1991 CS's spectral type (Tholen) / S (SMASSII) indicates that it is likely to contain magnesium silicate and iron silicate.

Close Approaches

1991 CS'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.

1991 CS has 16 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Aug. 25, 2021 21,755,205 20.711
Sept. 1, 2040 9,590,761 19.120
Feb. 22, 2041 25,499,216 18.616
Aug. 31, 2065 3,737,418 19.358
Feb. 23, 2066 28,135,637 18.469
Sept. 1, 2090 5,845,233 19.235
Feb. 23, 2091 26,956,753 18.521
Sept. 5, 2115 20,343,967 18.938
Feb. 24, 2116 24,787,523 18.964
Aug. 28, 2121 17,808,781 20.409
Feb. 24, 2141 29,705,158 19.715
Aug. 31, 2146 4,294,431 19.540
Sept. 1, 2171 3,692,444 19.488
Feb. 25, 2172 29,912,473 18.413
Feb. 24, 2191 27,687,453 19.533
Aug. 29, 2196 11,915,304 20.005

Images and Observations

1991 CS's orbit is determined by observations dating back to Jan. 19, 1991. It was last officially observed on Sept. 12, 2016. The IAU Minor Planet Center records 1,211 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 1991 CS:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.12289354092 AU
  • Eccentricity: 0.164698621108
  • Inclination: 37.1199432976°
  • Longitude of Ascending Node: 156.857463518°
  • Argument of Periapsis: 249.439124608°
  • Mean Anomaly: 325.499098922°

Physical Characteristics

  • Diameter: 1.60200 km
  • Magnitude: 17.4
  • Albedo: 0.075
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 435 days (1.19 years)
  • Avg. Orbit Speed: 28.11 km/s
  • Aphelion Distance: 1.31 AU
  • Perihelion Distance: 0.94 AU
  • Rotation Period: 2.39 days
  • Approx. Composition: magnesium silicate and iron silicate.

Size Comparison

Orbit Simulation

Sky Map

The position of 7822 (1991 CS) 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.