137199 (1999 KX4)

Key Facts

• Categorized as a Amor-class Asteroid
• Comparable in size to the U.S. Pentagon
• Will pass within 29,767,764 km of Earth in 2064
• Classified as a Near Earth Asteroid (NEA)
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

137199 (1999 KX4) is a mid-sized asteroid whose orbit approaches the orbit of Earth but does not cross it. NASA JPL has classified 1999 KX4 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.

1999 KX4 orbits the sun every 643 days (1.76 years), coming as close as 1.03 AU and reaching as far as 1.88 AU from the sun. Based on its brightness and the way it reflects light, 1999 KX4 is probably between 1.068 to 2.388 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. Pentagon.

The rotation of 1999 KX4 has been observed. It completes a rotation on its axis every 2.77 hours.

Close Approaches

1999 KX4's orbit is 0.19 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 KX4 has 2 close approaches predicted in the coming decades:

Images and Observations

1999 KX4's orbit is determined by observations dating back to Aug. 10, 1978. It was last officially observed on Oct. 15, 2022. The IAU Minor Planet Center records 3,651 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 KX4:

• 433 Eros (A898 PA)
• 1864 Daedalus (1971 FA)
• 6047 (1991 TB1)

References

• JPL Small Body Database
• Mission Design
• Sky Finder Chart

Orbit Simulation

Sky Map

The position of 137199 (1999 KX4) 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 KX4 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.