137126 (1999 CF9)

Small Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 137126 (1999 CF9)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the Golden Gate Bridge
  • Will pass within 7,902,757 km of Earth in 2025
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

137126 (1999 CF9) is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 CF9 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 CF9 orbits the sun every 863 days (2.36 years), coming as close as 0.71 AU and reaching as far as 2.84 AU from the sun. Based on its brightness and the way it reflects light, 1999 CF9 is probably between 0.629 to 1.406 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.

1999 CF9's spectral type None (Tholen) / Q (SMASSII) indicates that it is likely to contain .

Close Approaches

1999 CF9'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 CF9 has 10 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
March 8, 2025 7,902,757 18.606
Aug. 23, 2046 8,459,880 18.770
March 31, 2065 28,634,734 12.351
Aug. 11, 2079 17,762,915 13.995
March 8, 2098 7,591,043 18.667
Aug. 25, 2126 7,069,057 18.713
March 17, 2145 11,511,823 15.201
Sept. 2, 2166 28,850,659 22.947
March 15, 2178 6,032,706 16.429
Aug. 21, 2192 1,910,739 17.366

Images and Observations

1999 CF9's orbit is determined by observations dating back to Jan. 15, 1999. It was last officially observed on Nov. 29, 2021. The IAU Minor Planet Center records 694 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 CF9:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.774 AU
  • Eccentricity: 0.6002
  • Inclination: 5.55°
  • Longitude of Ascending Node: 157.04°
  • Argument of Periapsis: 90.31°
  • Mean Anomaly: 114.07°

Physical Characteristics

  • Diameter: ~0.812 km
  • Magnitude: 18.13
  • Spectral type (SMASS): Q

Derived Characteristics

  • Orbit Period: 863 days (2.36 years)
  • Avg. Orbit Speed: 22.36 km/s
  • Aphelion Distance: 2.84 AU
  • Perihelion Distance: 0.71 AU
  • Approx. Composition: .

Map Comparison

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Orbit Simulation

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Sky Map

The position of 137126 (1999 CF9) 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 CF9 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.