Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 20,279,938 km of Earth in 2022
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

1999 CG9 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 CG9 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.

1999 CG9 orbits the sun every 400 days (1.10 years), coming as close as 0.99 AU and reaching as far as 1.13 AU from the sun. Based on its brightness and the way it reflects light, 1999 CG9 is probably between 0.016 to 0.071 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

1999 CG9's orbit is 0.02 AU from Earth's orbit at its closest point. This means that there is a wide berth between this asteroid and Earth at all times.

1999 CG9 has 14 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
June 22, 2022 20,279,938 2.811
Feb. 6, 2034 6,823,385 2.739
July 12, 2058 17,436,757 3.014
Sept. 2, 2070 11,912,817 2.928
Jan. 31, 2071 12,025,844 4.108
Sept. 4, 2082 12,233,600 2.900
Jan. 31, 2083 11,289,273 4.019
July 17, 2094 17,653,101 3.134
Feb. 4, 2118 5,105,532 2.742
June 27, 2130 18,798,660 2.819
Jan. 31, 2143 9,934,870 3.799
Feb. 1, 2155 5,380,535 3.218
Feb. 1, 2178 4,487,611 3.124
Jan. 31, 2189 8,389,939 3.604

Images and Observations

1999 CG9's orbit is determined by observations dating back to Feb. 10, 1999. It was last officially observed on March 6, 1999. The IAU Minor Planet Center records 47 observations used to determine its orbit.

Accessibility and Exploration

1999 CG9 can be reached with a journey of 362 days. This trajectory would require a delta-v of 5.158 km/s. To put this into perspective, the delta-v to launch a rocket to Low-Earth Orbit is 9.7 km/s. There are 758,970 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 1999 CG9.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 1999 CG9:

References

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Orbital Elements

  • Epoch: 2459600.5 JD
  • Semi-major axis: 1.062 AU
  • Eccentricity: 0.0636
  • Inclination: 5.16°
  • Longitude of Ascending Node: 138.59°
  • Argument of Periapsis: 315.94°
  • Mean Anomaly: 36.88°

Physical Characteristics

  • Diameter: ~0.044 km
  • Magnitude: 25.2

Derived Characteristics

  • Orbit Period: 400 days (1.10 years)
  • Avg. Orbit Speed: 28.88 km/s
  • Aphelion Distance: 1.13 AU
  • Perihelion Distance: 0.99 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 1999 CG9 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.

Size Rendering

The below comparison is an artistic rendering that uses available data on the diameter of 1999 CG9 to create an approximate landscape rendering with New York City in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.