Key Facts

  • Classified as a Apollo-class Asteroid
  • Comparable in size to a football field
  • Will pass within 12,732,535 km of Earth in 2019
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

2011 TC4 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 TC4 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2011 TC4 orbits the sun every 666 days (1.82 years), coming as close as 0.42 AU and reaching as far as 2.57 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 2011 TC4 is probably between 0.23 to 0.52 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a football field.

Close Approaches

2011 TC4's orbit is 0.02 AU from Earth's orbit at its closest point. This means that there is a wide berth between this asteroid and Earth at all times.

2011 TC4 has 11 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
June 12, 2019 12,732,535 21.381
Oct. 28, 2022 10,078,289 25.350
June 20, 2039 16,817,389 26.377
Nov. 4, 2042 13,017,575 20.854
June 14, 2090 8,866,058 22.492
Oct. 30, 2093 4,774,867 24.177
June 21, 2110 16,886,171 26.377
Nov. 5, 2113 13,494,176 20.764
June 8, 2161 27,427,713 18.273
June 13, 2181 15,298,874 20.844
Oct. 28, 2184 15,974,817 26.542

Images and Observations

2011 TC4's orbit is determined by observations dating back to Oct. 3, 2011. It was last officially observed on Sept. 11, 2018. The IAU Minor Planet Center records 66 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 TC4:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.49182307576 AU
  • Eccentricity: 0.719757547757
  • Inclination: 3.12555637426°
  • Longitude of Ascending Node: 200.977841231°
  • Argument of Periapsis: 309.064607485°
  • Mean Anomaly: 2.12028236478°

Physical Characteristics

  • Diameter: ~0.30 km
  • Magnitude: 20.3

Derived Characteristics

  • Orbit Period: 666 days (1.82 years)
  • Avg. Orbit Speed: 24.39 km/s
  • Aphelion Distance: 2.57 AU
  • Perihelion Distance: 0.42 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 2011 TC4 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.