373135 (2011 SD173)

Mid-sized Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 373135 (2011 SD173)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the Golden Gate Bridge (1.05 km diameter)
  • Will pass within 28,292,903 km of Earth in 2030
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

373135 (2011 SD173) is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 SD173 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2011 SD173 orbits the sun every 776 days (2.12 years), coming as close as 0.83 AU and reaching as far as 2.47 AU from the sun. 2011 SD173 is about 1.1 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the Golden Gate Bridge.

Close Approaches

2011 SD173'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.

2011 SD173 has 10 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
June 3, 2030 28,292,903 10.644
May 31, 2047 27,598,321 10.544
May 25, 2064 26,496,110 10.393
May 20, 2081 25,139,771 10.228
May 20, 2098 25,201,967 10.229
May 25, 2115 26,268,375 10.345
May 31, 2132 27,602,765 10.561
June 6, 2149 28,519,017 10.661
June 12, 2166 29,045,209 10.756
June 17, 2183 29,233,039 10.738

Images and Observations

2011 SD173's orbit is determined by observations dating back to Oct. 11, 1996. It was last officially observed on Dec. 9, 2015. The IAU Minor Planet Center records 217 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 SD173:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.652 AU
  • Eccentricity: 0.4975
  • Inclination: 4.39°
  • Longitude of Ascending Node: 203.13°
  • Argument of Periapsis: 59.45°
  • Mean Anomaly: 297.3°

Physical Characteristics

  • Diameter: 1.05000 km
  • Magnitude: 19.52
  • Albedo: 0.025

Derived Characteristics

  • Orbit Period: 776 days (2.12 years)
  • Avg. Orbit Speed: 23.16 km/s
  • Aphelion Distance: 2.47 AU
  • Perihelion Distance: 0.83 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 373135 (2011 SD173) 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 above comparison is an artistic rendering that uses available data on the diameter of 2011 SD173 to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.