152770 (1999 RR28)

Small Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 152770 (1999 RR28)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the Golden Gate Bridge
  • Will pass within 28,709,684 km of Earth in 2023
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

152770 (1999 RR28) is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 RR28 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 RR28 orbits the sun every 941 days (2.58 years), coming as close as 0.65 AU and reaching as far as 3.11 AU from the sun. Based on its brightness and the way it reflects light, 1999 RR28 is probably between 0.553 to 1.236 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, very roughly comparable in size to the Golden Gate Bridge.

Close Approaches

1999 RR28'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.

1999 RR28 has 9 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 6, 2023 28,709,684 24.166
Oct. 1, 2048 28,554,812 23.986
Oct. 8, 2066 13,047,693 20.749
Oct. 11, 2084 7,972,374 19.131
Oct. 11, 2102 9,451,460 19.693
Oct. 5, 2120 23,327,840 22.886
April 8, 2149 28,601,095 24.074
March 30, 2167 5,748,047 19.315
March 30, 2185 5,541,614 19.229

Images and Observations

1999 RR28's orbit is determined by observations dating back to April 20, 1987. It was last officially observed on June 8, 2023. The IAU Minor Planet Center records 718 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 RR28:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.879 AU
  • Eccentricity: 0.654
  • Inclination: 7.14°
  • Longitude of Ascending Node: 178.18°
  • Argument of Periapsis: 284.55°
  • Mean Anomaly: 78.83°

Physical Characteristics

  • Diameter: ~0.714 km
  • Magnitude: 18.41

Derived Characteristics

  • Orbit Period: 941 days (2.58 years)
  • Avg. Orbit Speed: 21.72 km/s
  • Aphelion Distance: 3.11 AU
  • Perihelion Distance: 0.65 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 152770 (1999 RR28) 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 RR28 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.