Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to the U.S. Capitol building
- Will pass within 14,022,677 km of Earth in 2029
- Classified as a Near Earth Asteroid (NEA)
- Classified as a Potentially Hazardous Asteroid (PHA)
- See orbit simulation
Overview
2009 SW17 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2009 SW17 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.
2009 SW17 orbits the sun every 1,040 days (2.85 years), coming as close as 0.81 AU and reaching as far as 3.22 AU from the sun. Based on its brightness and the way it reflects light, 2009 SW17 is probably between 0.281 to 0.628 kilometers in diameter, making it larger than 90% of asteroids but tiny compared to large asteroids, very roughly comparable in size to the U.S. Capitol building.
Close Approaches
2009 SW17's orbit is 0.04 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 SW17 has 8 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Oct. 13, 2029 | 14,022,677 | 16.680 |
| Feb. 16, 2047 | 21,363,364 | 14.720 |
| Nov. 7, 2086 | 17,821,272 | 11.955 |
| Nov. 5, 2106 | 15,410,446 | 12.110 |
| Nov. 3, 2126 | 14,861,353 | 12.331 |
| Oct. 23, 2146 | 5,856,616 | 14.113 |
| Nov. 12, 2166 | 19,199,234 | 11.807 |
| Jan. 14, 2187 | 28,563,000 | 11.446 |
Images and Observations
2009 SW17's orbit is determined by observations dating back to Sept. 21, 2009. It was last officially observed on March 19, 2013. The IAU Minor Planet Center records 77 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 SW17:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 2.013 AU
- Eccentricity: 0.5982
- Inclination: 8.4°
- Longitude of Ascending Node: 42.44°
- Argument of Periapsis: 42.17°
- Mean Anomaly: 299.03°
Physical Characteristics
- Diameter: ~0.363 km
- Magnitude: 19.88
Derived Characteristics
- Orbit Period: 1,040 days (2.85 years)
- Avg. Orbit Speed: 21.06 km/s
- Aphelion Distance: 3.22 AU
- Perihelion Distance: 0.81 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2009 SW17 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 SW17 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.
