523654 (2011 SR5)

Very small Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 523654 (2011 SR5)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to a football field
  • Will pass within 25,685,134 km of Earth in 2034
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

523654 (2011 SR5) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 SR5 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2011 SR5 orbits the sun every 467 days (1.28 years), coming as close as 0.35 AU and reaching as far as 2.01 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 2011 SR5 is probably between 0.172 to 0.384 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a football field.

The rotation of 2011 SR5 has been observed. It completes a rotation on its axis every 10.07 hours.

Close Approaches

2011 SR5'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.

2011 SR5 has 11 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Sept. 29, 2034 25,685,134 22.070
Sept. 19, 2043 14,953,412 28.983
Sept. 23, 2066 476,167 26.357
Sept. 22, 2080 2,092,099 26.629
Sept. 17, 2094 22,769,504 30.420
Sept. 30, 2113 26,355,886 21.969
Sept. 26, 2127 4,854,369 25.445
Sept. 22, 2141 9,115,704 27.874
Sept. 18, 2155 26,550,544 31.136
Sept. 30, 2174 28,048,066 21.717
Sept. 27, 2188 11,588,931 24.275

Images and Observations

2011 SR5's orbit is determined by observations dating back to Sept. 19, 2011. It was last officially observed on Sept. 6, 2020. The IAU Minor Planet Center records 228 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 SR5:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.178 AU
  • Eccentricity: 0.7056
  • Inclination: 29.13°
  • Longitude of Ascending Node: 180.11°
  • Argument of Periapsis: 305.55°
  • Mean Anomaly: 88.63°

Physical Characteristics

  • Diameter: ~0.222 km
  • Magnitude: 20.95

Derived Characteristics

  • Orbit Period: 467 days (1.28 years)
  • Avg. Orbit Speed: 27.44 km/s
  • Aphelion Distance: 2.01 AU
  • Perihelion Distance: 0.35 AU
  • Rotation Period: 10.07 hours

Map Comparison

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Orbit Simulation

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Sky Map

The position of 523654 (2011 SR5) 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 SR5 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.