Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to Mount Everest
  • Will pass within 28,595,519 km of Earth in 2027
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

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

Ptah orbits the sun every 764 days (2.09 years), coming as close as 0.82 AU and reaching as far as 2.45 AU from the sun. Based on its brightness and the way it reflects light, Ptah is probably between 1.395 to 3.119 kilometers in diameter, making it larger than most asteroids, very roughly comparable in size to Mount Everest.

Close Approaches

Ptah'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.

Ptah has 16 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Nov. 3, 2027 28,595,519 17.437
Feb. 11, 2030 26,040,268 9.686
Nov. 10, 2050 15,813,073 14.131
March 9, 2053 14,457,268 10.070
Nov. 13, 2073 13,678,757 12.975
March 14, 2076 10,156,074 10.815
Nov. 9, 2096 17,345,456 14.589
March 4, 2099 18,235,100 9.628
Nov. 6, 2119 28,151,087 17.275
Feb. 11, 2122 26,557,370 9.778
Dec. 30, 2144 28,825,440 9.703
April 3, 2147 23,167,630 17.002
Nov. 23, 2167 16,231,713 10.657
March 23, 2170 2,918,959 12.493
Nov. 10, 2190 19,771,293 15.128
Feb. 28, 2193 20,863,663 9.479

Images and Observations

Ptah's orbit is determined by observations dating back to Sept. 24, 1960. It was last officially observed on July 11, 2018. The IAU Minor Planet Center records 603 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 Ptah:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.63557125727 AU
  • Eccentricity: 0.500075440153
  • Inclination: 7.40690677215°
  • Longitude of Ascending Node: 10.7654328114°
  • Argument of Periapsis: 105.739793385°
  • Mean Anomaly: 311.775905688°

Physical Characteristics

  • Diameter: ~1.801 km
  • Magnitude: 16.4

Derived Characteristics

  • Orbit Period: 764 days (2.09 years)
  • Avg. Orbit Speed: 23.29 km/s
  • Aphelion Distance: 2.45 AU
  • Perihelion Distance: 0.82 AU

Size Comparison

Orbit Simulation

Sky Map

The position of Ptah 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.