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 796 days (2.18 years), coming as close as 0.60 AU and reaching as far as 2.76 AU from the sun. Based on its brightness and the way it reflects light, 1999 RM45 is probably between 0.305 to 0.682 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 28,806,428 15.208
Sept. 1, 2071 13,567,917 18.025
Sept. 5, 2095 5,211,502 19.640
Aug. 26, 2119 28,604,869 15.289
March 8, 2141 12,465,677 18.175
March 6, 2165 7,412,472 19.157
March 16, 2189 28,928,033 15.083
Aug. 26, 2191 28,660,061 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 2, 2021. The IAU Minor Planet Center records 791 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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Orbital Elements

  • Epoch: 2459200.5 JD
  • Semi-major axis: 1.681 AU
  • Eccentricity: 0.6441
  • Inclination: 10.89°
  • Longitude of Ascending Node: 162.84°
  • Argument of Periapsis: 88.77°
  • Mean Anomaly: 303.79°

Physical Characteristics

  • Diameter: ~0.394 km
  • Magnitude: 19.7

Derived Characteristics

  • Orbit Period: 796 days (2.18 years)
  • Avg. Orbit Speed: 22.97 km/s
  • Aphelion Distance: 2.76 AU
  • Perihelion Distance: 0.60 AU

Map Comparison

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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.