Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to a school bus or smaller
- Will pass within 11,671,702 km of Earth in 2019
- Classified as a Near Earth Asteroid (NEA)
- Not a Potentially Hazardous Object
- See orbit simulation
Overview
2021 TC1 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2021 TC1 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 TC1 orbits the sun every 368 days (1.01 years), coming as close as 0.76 AU and reaching as far as 1.25 AU from the sun. Based on its brightness and the way it reflects light, 2021 TC1 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 TC1'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 TC1 has 43 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Oct. 11, 2019 | 11,671,702 | 9.043 |
| Oct. 12, 2020 | 6,405,629 | 7.713 |
| Oct. 14, 2021 | 5,599,982 | 6.593 |
| Oct. 16, 2022 | 9,146,743 | 5.504 |
| Oct. 15, 2023 | 14,674,319 | 4.302 |
| Sept. 29, 2024 | 20,583,848 | 4.189 |
| Nov. 9, 2024 | 20,911,997 | 4.177 |
| Sept. 15, 2025 | 25,270,608 | 4.812 |
| Nov. 28, 2025 | 25,288,139 | 5.461 |
| Sept. 4, 2026 | 28,829,000 | 5.308 |
| Dec. 11, 2026 | 28,423,515 | 6.364 |
| June 18, 2035 | 29,383,367 | 5.492 |
| March 18, 2036 | 26,914,178 | 5.491 |
| June 7, 2036 | 25,700,094 | 5.043 |
| April 8, 2037 | 22,366,182 | 3.822 |
| May 25, 2037 | 20,879,316 | 4.524 |
| May 11, 2038 | 14,722,289 | 4.485 |
| May 7, 2039 | 8,310,083 | 5.553 |
| May 7, 2040 | 3,724,319 | 6.703 |
| May 8, 2041 | 5,097,488 | 7.774 |
| May 10, 2042 | 11,831,466 | 9.224 |
| May 13, 2043 | 19,987,979 | 10.896 |
| May 14, 2044 | 28,591,791 | 12.597 |
| Oct. 6, 2116 | 29,874,175 | 12.891 |
| Oct. 10, 2117 | 19,939,631 | 10.846 |
| Oct. 13, 2118 | 10,903,689 | 8.922 |
| Oct. 15, 2119 | 5,287,726 | 7.154 |
| Oct. 17, 2120 | 9,072,995 | 5.565 |
| Oct. 14, 2121 | 16,970,148 | 3.953 |
| Sept. 21, 2122 | 24,127,967 | 4.601 |
| Nov. 25, 2122 | 24,076,910 | 5.137 |
| Sept. 6, 2123 | 29,071,093 | 5.290 |
| Dec. 12, 2123 | 28,413,626 | 6.388 |
| March 12, 2131 | 28,772,370 | 6.096 |
| June 15, 2131 | 27,958,003 | 5.313 |
| March 29, 2132 | 24,525,739 | 4.700 |
| May 31, 2132 | 23,083,678 | 4.740 |
| May 15, 2133 | 16,514,124 | 4.359 |
| May 8, 2134 | 8,964,262 | 5.429 |
| May 9, 2135 | 3,358,250 | 6.811 |
| May 10, 2136 | 6,418,262 | 8.134 |
| May 12, 2137 | 14,227,179 | 9.738 |
| May 15, 2138 | 23,081,687 | 11.538 |
Images and Observations
2021 TC1's orbit is determined by observations dating back to Oct. 3, 2021. It was last officially observed on Sept. 27, 2022. The IAU Minor Planet Center records 45 observations used to determine its orbit.
Accessibility and Exploration
2021 TC1 can be reached with a journey of 410 days. This trajectory would require a delta-v of 6.645 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 1,219,824 potential trajectories and launch windows to this asteroid.
See more at the NHATS Mission Trajectories table for 2021 TC1.
Similar Objects
These objects have orbits that share similar characteristics to the orbit of 2021 TC1:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 1.004 AU
- Eccentricity: 0.2466
- Inclination: 2.31°
- Longitude of Ascending Node: 261.18°
- Argument of Periapsis: 221.26°
- Mean Anomaly: 250.47°
Physical Characteristics
- Diameter: ~0.041 km
- Magnitude: 25.34
Derived Characteristics
- Orbit Period: 368 days (1.01 years)
- Avg. Orbit Speed: 29.68 km/s
- Aphelion Distance: 1.25 AU
- Perihelion Distance: 0.76 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2021 TC1 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 TC1 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.
