Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to the U.S. Capitol building
- Will pass within 17,211,123 km of Earth in 2021
- Classified as a Near Earth Asteroid (NEA)
- Classified as a Potentially Hazardous Asteroid (PHA)
- See orbit simulation
Overview
152664 (1998 FW4) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1998 FW4 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.
1998 FW4 orbits the sun every 1,470 days (4.02 years), coming as close as 0.72 AU and reaching as far as 4.33 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 1998 FW4 is probably between 0.308 to 0.689 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.
The rotation of 1998 FW4 has been observed. It completes a rotation on its axis every 17.38 hours.
Close Approaches
1998 FW4's orbit is 0.02 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.
1998 FW4 has 8 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| Sept. 23, 2021 | 17,211,123 | 21.327 |
| Sept. 29, 2025 | 3,852,769 | 18.606 |
| Sept. 30, 2029 | 3,911,207 | 18.585 |
| Oct. 11, 2033 | 10,967,901 | 15.262 |
| Jan. 29, 2046 | 18,015,551 | 13.555 |
| Oct. 8, 2094 | 4,242,107 | 16.659 |
| Feb. 23, 2103 | 23,551,922 | 21.228 |
| Sept. 29, 2182 | 5,036,741 | 18.948 |
Images and Observations
1998 FW4's orbit is determined by observations dating back to March 9, 1994. It was last officially observed on Feb. 4, 2022. The IAU Minor Planet Center records 595 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 1998 FW4:References
Search
or view a random objectOrbital Elements
- Epoch: 2460200.5 JD
- Semi-major axis: 2.526 AU
- Eccentricity: 0.7141
- Inclination: 3.42°
- Longitude of Ascending Node: 353.65°
- Argument of Periapsis: 85.41°
- Mean Anomaly: 165.81°
Physical Characteristics
- Diameter: ~0.398 km
- Magnitude: 19.68
Derived Characteristics
- Orbit Period: 1,470 days (4.02 years)
- Avg. Orbit Speed: 18.69 km/s
- Aphelion Distance: 4.33 AU
- Perihelion Distance: 0.72 AU
- Rotation Period: 17.38 hours
Map Comparison
Orbit Simulation
Sky Map
The position of 152664 (1998 FW4) 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 1998 FW4 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.
