Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to a basketball court
- Will pass within 28,519,078 km of Earth in 2068
- Classified as a Near Earth Asteroid (NEA)
- Classified as a Potentially Hazardous Asteroid (PHA)
- See orbit simulation
Overview
2021 CJ2 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2021 CJ2 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.
2021 CJ2 orbits the sun every 593 days (1.62 years), coming as close as 0.37 AU and reaching as far as 2.39 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 2021 CJ2 is probably between 0.128 to 0.287 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a basketball court.
Close Approaches
2021 CJ2'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.
2021 CJ2 has 9 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Feb. 6, 2068 | 28,519,078 | 30.409 |
| Feb. 3, 2081 | 22,675,236 | 29.166 |
| Feb. 2, 2094 | 18,595,999 | 28.310 |
| Feb. 6, 2107 | 26,362,154 | 29.951 |
| May 25, 2139 | 26,754,230 | 29.866 |
| May 28, 2152 | 16,626,800 | 27.727 |
| May 29, 2165 | 14,849,242 | 27.340 |
| May 28, 2178 | 18,216,432 | 28.053 |
| May 26, 2191 | 24,307,951 | 29.346 |
Images and Observations
2021 CJ2's orbit is determined by observations dating back to Jan. 14, 2021. It was last officially observed on May 14, 2022. The IAU Minor Planet Center records 33 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 2021 CJ2:References
Search
or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 1.381 AU
- Eccentricity: 0.7329
- Inclination: 3.94°
- Longitude of Ascending Node: 107.69°
- Argument of Periapsis: 261.8°
- Mean Anomaly: 264.22°
Physical Characteristics
- Diameter: ~0.166 km
- Magnitude: 21.58
Derived Characteristics
- Orbit Period: 593 days (1.62 years)
- Avg. Orbit Speed: 25.34 km/s
- Aphelion Distance: 2.39 AU
- Perihelion Distance: 0.37 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2021 CJ2 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 2021 CJ2 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.
