Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to a football field
- Will pass within 16,784,085 km of Earth in 2033
- Classified as a Near Earth Asteroid (NEA)
- Classified as a Potentially Hazardous Asteroid (PHA)
- See orbit simulation
Overview
2009 HA21 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2009 HA21 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.
2009 HA21 orbits the sun every 645 days (1.77 years), coming as close as 0.40 AU and reaching as far as 2.53 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 2009 HA21 is probably between 0.180 to 0.402 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a football field.
Close Approaches
2009 HA21'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.
2009 HA21 has 11 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Aug. 2, 2033 | 16,784,085 | 23.168 |
| March 19, 2046 | 11,701,678 | 22.050 |
| Aug. 5, 2063 | 19,375,397 | 21.833 |
| March 20, 2076 | 8,392,627 | 22.918 |
| Aug. 6, 2093 | 20,202,058 | 21.535 |
| March 21, 2106 | 9,083,596 | 22.683 |
| Aug. 5, 2123 | 17,308,037 | 22.687 |
| March 18, 2136 | 17,680,706 | 20.691 |
| Aug. 1, 2153 | 17,141,636 | 25.029 |
| March 29, 2173 | 18,897,856 | 27.506 |
| July 28, 2183 | 27,821,296 | 28.381 |
Images and Observations
2009 HA21's orbit is determined by observations dating back to April 20, 2009. It was last officially observed on April 16, 2023. The IAU Minor Planet Center records 98 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 2009 HA21:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 1.461 AU
- Eccentricity: 0.7291
- Inclination: 6.41°
- Longitude of Ascending Node: 205.41°
- Argument of Periapsis: 219.89°
- Mean Anomaly: 116.37°
Physical Characteristics
- Diameter: ~0.232 km
- Magnitude: 20.85
Derived Characteristics
- Orbit Period: 645 days (1.77 years)
- Avg. Orbit Speed: 24.64 km/s
- Aphelion Distance: 2.53 AU
- Perihelion Distance: 0.40 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2009 HA21 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 2009 HA21 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.
