399325 (1999 GY5)

Small Apollo-class Asteroid

Near-Earth
Space Reference » Apollo-class Asteroids » 399325 (1999 GY5)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the Golden Gate Bridge (0.67 km diameter)
  • Will pass within 10,534,356 km of Earth in 2026
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

399325 (1999 GY5) is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 GY5 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.

1999 GY5 orbits the sun every 448 days (1.23 years), coming as close as 0.44 AU and reaching as far as 1.85 AU from the sun. 1999 GY5 is about 0.7 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, comparable in size to the Golden Gate Bridge.

Close Approaches

1999 GY5's orbit is 0.06 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.

1999 GY5 has 9 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 5, 2026 10,534,356 21.386
April 7, 2053 11,569,651 23.330
April 3, 2069 19,365,198 19.405
April 10, 2096 18,629,265 25.069
April 7, 2112 9,026,567 22.338
April 5, 2128 14,916,093 20.199
April 3, 2144 28,221,385 18.023
April 11, 2171 16,376,221 24.686
April 8, 2187 8,603,495 21.866

Images and Observations

1999 GY5's orbit is determined by observations dating back to April 14, 1999. It was last officially observed on May 29, 2020. The IAU Minor Planet Center records 190 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 1999 GY5:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.146 AU
  • Eccentricity: 0.6147
  • Inclination: 24.43°
  • Longitude of Ascending Node: 203.38°
  • Argument of Periapsis: 232.21°
  • Mean Anomaly: 15.32°

Physical Characteristics

  • Diameter: 0.66900 km
  • Magnitude: 20.17
  • Albedo: 0.039

Derived Characteristics

  • Orbit Period: 448 days (1.23 years)
  • Avg. Orbit Speed: 27.83 km/s
  • Aphelion Distance: 1.85 AU
  • Perihelion Distance: 0.44 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 399325 (1999 GY5) 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 1999 GY5 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.