Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to a basketball court
- Will pass within 23,813,163 km of Earth in 2019
- Classified as a Near Earth Asteroid (NEA)
- Not a Potentially Hazardous Object
- See orbit simulation
Overview
2011 QG21 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 QG21 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.
2011 QG21 orbits the sun every 490 days (1.34 years), coming as close as 0.68 AU and reaching as far as 1.75 AU from the sun. Based on its brightness and the way it reflects light, 2011 QG21 is probably between 0.121 to 0.272 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a basketball court.
Close Approaches
2011 QG21'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.
2011 QG21 has 18 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Aug. 17, 2019 | 23,813,163 | 20.149 |
| Jan. 26, 2034 | 26,790,166 | 20.893 |
| Feb. 3, 2038 | 10,631,992 | 17.311 |
| Feb. 12, 2042 | 19,197,093 | 14.310 |
| Aug. 7, 2070 | 18,777,655 | 13.710 |
| Aug. 11, 2074 | 7,870,708 | 16.756 |
| Aug. 17, 2078 | 24,871,158 | 20.382 |
| Jan. 27, 2093 | 24,807,602 | 20.546 |
| Feb. 4, 2097 | 9,659,680 | 16.864 |
| Feb. 15, 2101 | 21,604,137 | 13.935 |
| Aug. 9, 2129 | 13,006,957 | 14.636 |
| Aug. 14, 2133 | 11,567,155 | 17.845 |
| Jan. 31, 2152 | 18,507,460 | 19.343 |
| Feb. 8, 2156 | 10,524,183 | 15.934 |
| Feb. 20, 2160 | 27,807,200 | 13.169 |
| Aug. 6, 2184 | 23,909,990 | 12.938 |
| Aug. 11, 2188 | 7,159,384 | 16.014 |
| Aug. 16, 2192 | 19,742,561 | 19.470 |
Images and Observations
2011 QG21's orbit is determined by observations dating back to Aug. 22, 2011. It was last officially observed on Sept. 12, 2015. The IAU Minor Planet Center records 51 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 2011 QG21:References
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or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 1.216 AU
- Eccentricity: 0.4387
- Inclination: 18.78°
- Longitude of Ascending Node: 324.97°
- Argument of Periapsis: 255.08°
- Mean Anomaly: 58.45°
Physical Characteristics
- Diameter: ~0.157 km
- Magnitude: 21.7
Derived Characteristics
- Orbit Period: 490 days (1.34 years)
- Avg. Orbit Speed: 27.00 km/s
- Aphelion Distance: 1.75 AU
- Perihelion Distance: 0.68 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 2011 QG21 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 2011 QG21 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.
