Key Facts

  • Classified as a Apollo-class Asteroid
  • Comparable in size to Mount Everest (2.56 km diameter)
  • Will pass within 20,533,782 km of Earth in 2019
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

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

Geographos orbits the sun every 508 days (1.39 years), coming as close as 0.83 AU and reaching as far as 1.66 AU from the sun. Geographos is about 2.6 kilometers in diameter, making it larger than most asteroids, comparable in size to Mount Everest.

The rotation of Geographos has been observed. It completes a rotation on its axis every 5.22 days.

Geographos's spectral type S (Tholen) / S (SMASSII) indicates that it is likely to contain magnesium silicate and iron silicate.

Close Approaches

Geographos's orbit is 0.03 AU from Earth's orbit at its closest point. This means that there is an wide berth between this asteroid and Earth at all times.

Geographos has 17 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Aug. 31, 2019 20,533,782 15.284
Aug. 12, 2026 25,497,350 8.362
March 12, 2040 17,000,263 13.743
Aug. 23, 2051 7,162,958 11.013
March 13, 2065 14,450,971 12.952
Aug. 20, 2076 11,723,898 10.225
March 11, 2090 22,560,598 15.006
Sept. 3, 2094 28,427,683 16.694
Aug. 7, 2101 29,626,236 8.012
March 18, 2108 20,879,019 9.391
Aug. 27, 2119 5,029,022 12.389
March 18, 2133 15,048,823 10.694
Aug. 29, 2144 10,550,465 13.518
March 20, 2158 26,193,065 8.646
March 11, 2165 26,985,082 15.884
Aug. 20, 2176 14,007,476 9.873
March 16, 2190 14,445,004 12.719

Images and Observations

Geographos's orbit is determined by observations dating back to Aug. 31, 1951. It was last officially observed on July 6, 2019. The IAU Minor Planet Center records 4,097 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 Geographos:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.24530233962 AU
  • Eccentricity: 0.33544049791
  • Inclination: 13.3373470741°
  • Longitude of Ascending Node: 337.195396798°
  • Argument of Periapsis: 276.915041674°
  • Mean Anomaly: 311.532956515°

Physical Characteristics

  • Diameter: 2.56000 km
  • Magnitude: 15.60
  • Albedo: 0.290
  • Spectral type (Tholen): S
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 508 days (1.39 years)
  • Avg. Orbit Speed: 26.69 km/s
  • Aphelion Distance: 1.66 AU
  • Perihelion Distance: 0.83 AU
  • Rotation Period: 5.22 days
  • Approx. Composition: magnesium silicate and iron silicate.

Size Comparison

Orbit Simulation

Sky Map

The position of Geographos 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.