Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 11,469,950 km of Earth in 2019
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

2021 RS2 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2021 RS2 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.

2021 RS2 orbits the sun every 546 days (1.49 years), coming as close as 0.65 AU and reaching as far as 1.97 AU from the sun. Based on its brightness and the way it reflects light, 2021 RS2 is probably between 0.002 to 0.005 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

2021 RS2's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is very close to Earth's orbit.

2021 RS2 has 16 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
March 22, 2019 11,469,950 15.389
Sept. 8, 2021 21,705 17.602
Sept. 4, 2024 9,880,832 18.304
Sept. 1, 2027 21,459,055 20.416
March 19, 2080 24,408,530 21.007
March 16, 2083 13,115,938 18.864
March 12, 2086 4,564,802 17.035
March 9, 2089 6,476,806 15.680
March 5, 2092 14,800,374 14.124
Feb. 28, 2095 25,045,506 12.449
Sept. 17, 2133 20,538,572 13.020
Sept. 13, 2136 10,703,053 14.676
Sept. 11, 2139 2,555,909 16.107
Sept. 10, 2142 890,328 16.460
Sept. 14, 2145 12,254,861 14.406
Sept. 19, 2148 24,659,889 12.329

Images and Observations

2021 RS2's orbit is determined by observations dating back to Sept. 7, 2021. It was last officially observed on Sept. 8, 2021. The IAU Minor Planet Center records 41 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 2021 RS2:

References

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Orbital Elements

  • Epoch: 2459600.5 JD
  • Semi-major axis: 1.307 AU
  • Eccentricity: 0.5046
  • Inclination: 14.56°
  • Longitude of Ascending Node: 165.6°
  • Argument of Periapsis: 273.69°
  • Mean Anomaly: 51.6°

Physical Characteristics

  • Diameter: ~0.003 km
  • Magnitude: 30.35

Derived Characteristics

  • Orbit Period: 546 days (1.49 years)
  • Avg. Orbit Speed: 26.04 km/s
  • Aphelion Distance: 1.97 AU
  • Perihelion Distance: 0.65 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 2021 RS2 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.