Key Facts
- Categorized as a Apollo-class Asteroid
- Comparable in size to the U.S. Capitol building
- Will pass within 2,930,149 km of Earth in 2021
- Classified as a Near Earth Asteroid (NEA)
- Classified as a Potentially Hazardous Asteroid (PHA)
- See orbit simulation
Overview
1999 RM45 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 RM45 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.
1999 RM45 orbits the sun every 798 days (2.18 years), coming as close as 0.60 AU and reaching as far as 2.77 AU from the sun. Based on its brightness and the way it reflects light, 1999 RM45 is probably between 0.291 to 0.652 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
1999 RM45's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.
1999 RM45 has 9 close approaches predicted in the coming decades:
| Date | Distance from Earth (km) | Velocity (km/s) |
|---|---|---|
| March 2, 2021 | 2,930,149 | 20.038 |
| Aug. 24, 2047 | 28,806,307 | 15.208 |
| Sept. 1, 2071 | 13,567,649 | 18.025 |
| Sept. 5, 2095 | 5,211,508 | 19.640 |
| Aug. 26, 2119 | 28,605,145 | 15.289 |
| March 8, 2141 | 12,465,363 | 18.175 |
| March 6, 2165 | 7,412,512 | 19.157 |
| March 16, 2189 | 28,928,288 | 15.083 |
| Aug. 26, 2191 | 28,659,778 | 15.323 |
Images and Observations
1999 RM45's orbit is determined by observations dating back to Sept. 14, 1999. It was last officially observed on March 1, 2021. The IAU Minor Planet Center records 349 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 1999 RM45:References
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or view a random objectOrbital Elements
- Epoch: 2459396.5 JD
- Semi-major axis: 1.683 AU
- Eccentricity: 0.6443
- Inclination: 10.89°
- Longitude of Ascending Node: 162.83°
- Argument of Periapsis: 88.7°
- Mean Anomaly: 32.35°
Physical Characteristics
- Diameter: ~0.376 km
- Magnitude: 19.8
Derived Characteristics
- Orbit Period: 798 days (2.18 years)
- Avg. Orbit Speed: 22.94 km/s
- Aphelion Distance: 2.77 AU
- Perihelion Distance: 0.60 AU
Map Comparison
Orbit Simulation
Sky Map
The position of 1999 RM45 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 1999 RM45 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.
