137427 (1999 TF211)

Mid-sized Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 137427 (1999 TF211)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the island of Manhattan
  • Will pass within 14,110,096 km of Earth in 2065
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

137427 (1999 TF211) is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1999 TF211 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 TF211 orbits the sun every 1,390 days (3.81 years), coming as close as 0.95 AU and reaching as far as 3.93 AU from the sun. Based on its brightness and the way it reflects light, 1999 TF211 is probably between 2.315 to 5.177 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the island of Manhattan.

Close Approaches

1999 TF211's orbit is 0.03 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 TF211 has 4 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
March 3, 2065 14,110,096 24.709
Feb. 28, 2103 26,550,437 24.217
March 2, 2179 19,419,143 24.541
March 5, 2198 10,372,253 24.330

Images and Observations

1999 TF211's orbit is determined by observations dating back to Oct. 6, 1999. It was last officially observed on April 7, 2023. The IAU Minor Planet Center records 651 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 TF211:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.44 AU
  • Eccentricity: 0.6115
  • Inclination: 39.48°
  • Longitude of Ascending Node: 347.92°
  • Argument of Periapsis: 162.39°
  • Mean Anomaly: 29.11°

Physical Characteristics

  • Diameter: ~2.989 km
  • Magnitude: 15.3

Derived Characteristics

  • Orbit Period: 1,390 days (3.81 years)
  • Avg. Orbit Speed: 19.10 km/s
  • Aphelion Distance: 3.93 AU
  • Perihelion Distance: 0.95 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 137427 (1999 TF211) 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 TF211 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.