Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the San Francisco Bay
  • Will pass within 19,427,848 km of Earth in 2023
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

98943 (2001 CC21) is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2001 CC21 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.

2001 CC21 orbits the sun every 383 days (1.05 years), coming as close as 0.81 AU and reaching as far as 1.26 AU from the sun. Based on its brightness and the way it reflects light, 2001 CC21 is probably between 3.470 to 15.520 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.

The rotation of 2001 CC21 has been observed. It completes a rotation on its axis every 5.02 days.

2001 CC21's spectral type None (Tholen) / L (SMASSII) indicates that it is likely to contain magnesium silicate, aluminum, and iron silicate.

Close Approaches

2001 CC21's orbit is 0.08 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.

2001 CC21 has 32 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
March 21, 2023 19,427,848 4.464
Aug. 28, 2025 19,922,257 4.340
March 1, 2044 13,775,742 8.215
May 9, 2045 29,023,360 7.139
July 10, 2046 28,936,125 6.963
Sept. 16, 2047 14,379,314 8.413
Feb. 24, 2065 28,334,017 12.170
Feb. 16, 2066 24,051,300 4.285
April 7, 2066 22,706,983 5.319
Sept. 10, 2068 15,614,220 5.197
March 7, 2087 13,681,168 5.875
Aug. 2, 2089 24,789,689 5.640
Oct. 8, 2089 26,306,113 4.795
Sept. 20, 2090 24,606,623 11.230
March 2, 2108 15,858,651 9.017
May 5, 2109 28,150,612 6.892
July 6, 2110 29,647,879 7.192
Sept. 17, 2111 13,125,307 7.803
March 22, 2130 19,158,731 4.554
Aug. 31, 2132 19,844,866 4.246
March 4, 2151 13,161,290 7.900
May 14, 2152 29,399,535 7.289
July 15, 2153 28,387,705 6.748
Sept. 19, 2154 16,146,771 9.058
Feb. 28, 2172 24,213,997 11.212
Feb. 7, 2173 26,995,468 4.850
April 18, 2173 24,707,682 5.912
Sept. 14, 2175 13,606,933 5.976
March 11, 2194 15,369,522 5.239
Aug. 12, 2196 23,191,894 5.122
Oct. 2, 2196 23,967,204 4.413
Sept. 23, 2197 27,765,884 11.968

Images and Observations

2001 CC21's orbit is determined by observations dating back to Nov. 10, 1982. It was last officially observed on Sept. 26, 2019. The IAU Minor Planet Center records 619 observations used to determine its orbit.

Accessibility and Exploration

2001 CC21 can be reached with a journey of 450 days. This trajectory would require a delta-v of 8.989 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 57,500 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2001 CC21.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2001 CC21:

References

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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 1.032 AU
  • Eccentricity: 0.2191
  • Inclination: 4.81°
  • Longitude of Ascending Node: 75.57°
  • Argument of Periapsis: 179.4°
  • Mean Anomaly: 61.06°

Physical Characteristics

  • Diameter: ~9.495 km
  • Magnitude: 18.5
  • Spectral type (SMASS): L

Derived Characteristics

  • Orbit Period: 383 days (1.05 years)
  • Avg. Orbit Speed: 29.31 km/s
  • Aphelion Distance: 1.26 AU
  • Perihelion Distance: 0.81 AU
  • Rotation Period: 5.02 hours
  • Approx. Composition: magnesium silicate, aluminum, and iron silicate.

Map Comparison

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Orbit Simulation

Sky Map

The position of 98943 (2001 CC21) 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.