2011 HJ7

Very small Apollo-class Asteroid

Near-Earth
Space Reference » Apollo-class Asteroids » 2011 HJ7

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 2,513,797 km of Earth in 2025
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

2011 HJ7 is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2011 HJ7 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.

2011 HJ7 orbits the sun every 510 days (1.40 years), coming as close as 0.60 AU and reaching as far as 1.89 AU from the sun. Based on its brightness and the way it reflects light, 2011 HJ7 is probably between 0.088 to 0.198 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

2011 HJ7's orbit is 0.01 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.

2011 HJ7 has 9 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
May 12, 2025 2,513,797 15.779
May 11, 2032 2,579,365 16.727
May 5, 2039 22,255,682 20.654
Dec. 10, 2068 25,862,389 21.487
Nov. 22, 2075 27,841,418 10.596
May 7, 2078 16,896,700 19.518
Dec. 1, 2086 5,804,797 15.045
May 11, 2089 3,619,529 16.857
Nov. 29, 2097 12,151,595 13.732

Images and Observations

2011 HJ7's orbit is determined by observations dating back to April 26, 2011. It was last officially observed on Dec. 24, 2022. The IAU Minor Planet Center records 102 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 HJ7:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.249 AU
  • Eccentricity: 0.5159
  • Inclination: 1.13°
  • Longitude of Ascending Node: 34.56°
  • Argument of Periapsis: 297.22°
  • Mean Anomaly: 249.6°

Physical Characteristics

  • Diameter: ~0.114 km
  • Magnitude: 22.39

Derived Characteristics

  • Orbit Period: 510 days (1.40 years)
  • Avg. Orbit Speed: 26.64 km/s
  • Aphelion Distance: 1.89 AU
  • Perihelion Distance: 0.60 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 2011 HJ7 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 HJ7 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.