Key Facts
- Categorized as a Aten-class Asteroid
- Comparable in size to a school bus or smaller
- Will pass within 27,572,003 km of Earth in 2019
- Classified as a Near Earth Asteroid (NEA)
- Not a Potentially Hazardous Object
- See orbit simulation
Overview
2021 CT1 is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 2021 CT1 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.
2021 CT1 orbits the sun every 357 days (0.98 years), coming as close as 0.83 AU and reaching as far as 1.14 AU from the sun. Based on its brightness and the way it reflects light, 2021 CT1 is probably between 0.015 to 0.067 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.
Close Approaches
2021 CT1's orbit is 0.05 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 CT1 has 41 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Jan. 17, 2019 | 27,572,003 | 10.752 |
| Jan. 17, 2020 | 9,510,968 | 7.129 |
| Jan. 29, 2021 | 13,842,785 | 5.445 |
| Feb. 28, 2022 | 25,056,622 | 5.469 |
| Sept. 7, 2022 | 27,875,784 | 6.528 |
| April 9, 2023 | 29,877,873 | 4.527 |
| Aug. 6, 2023 | 20,937,269 | 6.267 |
| July 6, 2024 | 14,996,678 | 6.286 |
| June 17, 2025 | 22,506,854 | 8.617 |
| Jan. 16, 2063 | 18,103,648 | 8.900 |
| Jan. 20, 2064 | 7,814,504 | 5.995 |
| Nov. 10, 2064 | 29,612,095 | 3.914 |
| Feb. 12, 2065 | 20,055,750 | 5.452 |
| March 18, 2066 | 28,514,934 | 5.204 |
| Aug. 21, 2066 | 24,547,472 | 6.454 |
| July 20, 2067 | 16,821,413 | 6.078 |
| June 23, 2068 | 17,360,310 | 7.365 |
| Jan. 17, 2106 | 14,615,740 | 8.236 |
| Jan. 24, 2107 | 9,709,280 | 5.687 |
| Feb. 21, 2108 | 22,446,101 | 5.465 |
| Sept. 16, 2108 | 29,198,779 | 6.419 |
| March 28, 2109 | 29,468,866 | 4.943 |
| Aug. 14, 2109 | 22,708,106 | 6.373 |
| July 13, 2110 | 15,435,864 | 6.141 |
| June 21, 2111 | 20,234,451 | 8.093 |
| Jan. 18, 2148 | 22,763,606 | 9.817 |
| Jan. 18, 2149 | 7,171,807 | 6.470 |
| Feb. 7, 2150 | 17,437,370 | 5.419 |
| March 12, 2151 | 27,448,914 | 5.328 |
| Aug. 28, 2151 | 25,831,760 | 6.493 |
| July 26, 2152 | 17,994,141 | 6.107 |
| June 28, 2153 | 15,780,066 | 6.931 |
| June 14, 2154 | 28,935,541 | 10.021 |
| Jan. 17, 2191 | 15,757,250 | 8.464 |
| Jan. 23, 2192 | 8,817,017 | 5.778 |
| Feb. 18, 2193 | 21,875,163 | 5.449 |
| Sept. 18, 2193 | 29,444,059 | 6.359 |
| March 27, 2194 | 29,422,647 | 4.972 |
| Aug. 15, 2194 | 22,942,092 | 6.359 |
| July 14, 2195 | 15,343,264 | 6.135 |
| June 21, 2196 | 19,987,442 | 8.083 |
Images and Observations
2021 CT1's orbit is determined by observations dating back to Jan. 24, 2020. It was last officially observed on Feb. 16, 2021. The IAU Minor Planet Center records 33 observations used to determine its orbit.
Accessibility and Exploration
2021 CT1 can be reached with a journey of 378 days. This trajectory would require a delta-v of 8.03 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 113,283 potential trajectories and launch windows to this asteroid.
See more at the NHATS Mission Trajectories table for 2021 CT1.
Similar Objects
These objects have orbits that share similar characteristics to the orbit of 2021 CT1:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 0.9856 AU
- Eccentricity: 0.153
- Inclination: 8.83°
- Longitude of Ascending Node: 131.12°
- Argument of Periapsis: 235.42°
- Mean Anomaly: 354.82°
Physical Characteristics
- Diameter: ~0.041 km
- Magnitude: 25.32
Derived Characteristics
- Orbit Period: 357 days (0.98 years)
- Avg. Orbit Speed: 30.03 km/s
- Aphelion Distance: 1.14 AU
- Perihelion Distance: 0.83 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2021 CT1 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 CT1 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.
