357022 (1999 YG3)

Very small Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 357022 (1999 YG3)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the U.S. Capitol building (0.43 km diameter)
  • Will pass within 16,685,179 km of Earth in 2051
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

357022 (1999 YG3) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 YG3 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 YG3 orbits the sun every 532 days (1.46 years), coming as close as 0.86 AU and reaching as far as 1.71 AU from the sun. 1999 YG3 is about 0.4 kilometers in diameter, making it larger than 90% of asteroids but tiny compared to large asteroids, comparable in size to the U.S. Capitol building.

1999 YG3's spectral type None (Tholen) / S (SMASSII) indicates that it is likely to contain and .

Close Approaches

1999 YG3's orbit is 0.04 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 YG3 has 8 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Jan. 12, 2051 16,685,179 21.729
Jan. 14, 2067 7,132,149 20.505
Jan. 16, 2083 7,236,545 19.891
Jan. 19, 2099 16,720,490 19.030
Jan. 12, 2150 18,198,026 21.901
Jan. 15, 2166 7,660,344 20.593
Jan. 17, 2182 6,699,109 19.986
Jan. 19, 2198 14,447,441 19.177

Images and Observations

1999 YG3's orbit is determined by observations dating back to Dec. 20, 1999. It was last officially observed on July 6, 2022. The IAU Minor Planet Center records 323 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 YG3:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.285 AU
  • Eccentricity: 0.3296
  • Inclination: 34.51°
  • Longitude of Ascending Node: 293.26°
  • Argument of Periapsis: 250.25°
  • Mean Anomaly: 47.77°

Physical Characteristics

  • Diameter: 0.43200 km
  • Magnitude: 19.07
  • Albedo: 0.217
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 532 days (1.46 years)
  • Avg. Orbit Speed: 26.28 km/s
  • Aphelion Distance: 1.71 AU
  • Perihelion Distance: 0.86 AU
  • Approx. Composition: and .

Map Comparison

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Orbit Simulation

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Sky Map

The position of 357022 (1999 YG3) 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 1999 YG3 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.