2021 HE1 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2021 HE1 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 HE1 orbits the sun every 607 days (1.66 years), coming as close as 0.81 AU and reaching as far as 1.99 AU from the sun. Based on its brightness and the way it reflects light, 2021 HE1 is probably between 0.004 to 0.010 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.
2021 HE1's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is very close to Earth's orbit.
2021 HE1 has 5 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| April 17, 2021 | 228,279 | 11.726 |
| April 10, 2026 | 10,070,871 | 9.748 |
| Nov. 30, 2055 | 14,416,198 | 11.404 |
| Nov. 23, 2060 | 21,467,858 | 14.417 |
| April 20, 2124 | 3,003,614 | 12.077 |
2021 HE1's orbit is determined by observations dating back to April 18, 2021. It was last officially observed on April 20, 2021. The IAU Minor Planet Center records 47 observations used to determine its orbit.
The position of 2021 HE1 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.