523589 (2001 HA4)

Mid-sized Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 523589 (2001 HA4)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to Mount Everest (1.85 km diameter)
  • Will pass within 20,632,218 km of Earth in 2067
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

523589 (2001 HA4) is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2001 HA4 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2001 HA4 orbits the sun every 1,610 days (4.41 years), coming as close as 0.56 AU and reaching as far as 4.82 AU from the sun. Its orbit is highly elliptical. 2001 HA4 is about 1.9 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to Mount Everest.

Close Approaches

2001 HA4'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.

2001 HA4 has 6 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
March 26, 2067 20,632,218 28.539
March 14, 2089 14,301,367 23.005
March 12, 2111 17,329,385 22.179
Sept. 27, 2119 20,633,071 21.513
Sept. 17, 2141 17,669,378 26.627
Sept. 17, 2163 16,866,769 26.205

Images and Observations

2001 HA4's orbit is determined by observations dating back to April 16, 2001. It was last officially observed on May 24, 2023. The IAU Minor Planet Center records 243 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 2001 HA4:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.69 AU
  • Eccentricity: 0.7933
  • Inclination: 17.18°
  • Longitude of Ascending Node: 354.05°
  • Argument of Periapsis: 95.61°
  • Mean Anomaly: 45.65°

Physical Characteristics

  • Diameter: 1.85100 km
  • Magnitude: 17.79
  • Albedo: 0.047

Derived Characteristics

  • Orbit Period: 1,610 days (4.41 years)
  • Avg. Orbit Speed: 18.18 km/s
  • Aphelion Distance: 4.82 AU
  • Perihelion Distance: 0.56 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 523589 (2001 HA4) 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 2001 HA4 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.