Key Facts
- Categorized as a Aten-class Asteroid
- Comparable in size to a school bus or smaller
- Will pass within 13,415,315 km of Earth in 2021
- Classified as a Near Earth Asteroid (NEA)
- Not a Potentially Hazardous Object
- See orbit simulation
Overview
2021 HZ is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 2021 HZ 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 HZ orbits the sun every 290 days (0.79 years), coming as close as 0.59 AU and reaching as far as 1.13 AU from the sun. Based on its brightness and the way it reflects light, 2021 HZ is probably between 0.015 to 0.066 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.
Close Approaches
2021 HZ's orbit is 0.01 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.
2021 HZ has 9 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| April 26, 2021 | 13,415,315 | 6.845 |
| May 8, 2025 | 7,647,560 | 10.187 |
| Feb. 9, 2036 | 26,661,773 | 13.141 |
| Feb. 9, 2040 | 14,227,137 | 7.789 |
| May 7, 2052 | 6,960,440 | 10.041 |
| Feb. 8, 2063 | 21,536,098 | 11.801 |
| May 7, 2079 | 18,261,915 | 12.351 |
| Feb. 9, 2164 | 23,812,251 | 12.452 |
| May 7, 2196 | 20,045,294 | 12.714 |
Images and Observations
2021 HZ's orbit is determined by observations dating back to April 17, 2021. It was last officially observed on April 21, 2021. The IAU Minor Planet Center records 21 observations used to determine its orbit.
Accessibility and Exploration
2021 HZ can be reached with a journey of 378 days. This trajectory would require a delta-v of 10.726 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 4,828 potential trajectories and launch windows to this asteroid.
See more at the NHATS Mission Trajectories table for 2021 HZ.
Similar Objects
These objects have orbits that share similar characteristics to the orbit of 2021 HZ:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 0.8579 AU
- Eccentricity: 0.3146
- Inclination: 5.47°
- Longitude of Ascending Node: 42.94°
- Argument of Periapsis: 322.3°
- Mean Anomaly: 227.05°
Physical Characteristics
- Diameter: ~0.041 km
- Magnitude: 25.37
Derived Characteristics
- Orbit Period: 290 days (0.79 years)
- Avg. Orbit Speed: 32.18 km/s
- Aphelion Distance: 1.13 AU
- Perihelion Distance: 0.59 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2021 HZ 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 HZ 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.
