Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the U.S. Capitol building (0.42 km diameter)
  • Will pass within 14,954,636 km of Earth in 2027
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

207945 (1991 JW) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1991 JW as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1991 JW orbits the sun every 387 days (1.06 years), coming as close as 0.92 AU and reaching as far as 1.16 AU from the sun. 1991 JW is about 0.4 kilometers in diameter, making it larger than 90% of asteroids but tiny compared to large asteroids, comparable in size to the U.S. Capitol building.

The rotation of 1991 JW has been observed. It completes a rotation on its axis every 3.15 hours.

Close Approaches

1991 JW's orbit is 0.02 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.

1991 JW has 26 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
May 19, 2027 14,954,636 4.952
Nov. 30, 2028 20,121,502 8.829
June 2, 2044 26,267,887 9.295
April 26, 2045 24,476,944 5.009
Oct. 22, 2045 18,336,787 4.918
June 3, 2062 17,639,592 7.705
April 12, 2063 28,720,640 4.985
Nov. 10, 2063 10,594,324 5.027
June 1, 2080 28,106,067 9.663
May 1, 2081 22,381,011 4.980
Oct. 9, 2081 21,477,942 4.849
May 22, 2099 12,993,489 5.023
Nov. 29, 2100 15,383,811 8.012
May 22, 2117 13,396,628 5.008
Nov. 30, 2118 17,160,270 8.314
June 3, 2134 29,338,968 9.878
May 2, 2135 22,650,904 4.989
Oct. 13, 2135 20,916,467 4.866
June 3, 2152 17,808,750 7.727
April 12, 2153 28,722,013 4.993
Nov. 10, 2153 10,625,020 5.019
June 3, 2170 24,891,727 9.076
April 27, 2171 24,381,434 5.004
Oct. 21, 2171 18,918,825 4.914
May 19, 2189 14,720,546 4.961
Dec. 1, 2190 17,953,693 8.459

Images and Observations

1991 JW's orbit is determined by observations dating back to April 16, 1955. It was last officially observed on May 23, 2011. The IAU Minor Planet Center records 339 observations used to determine its orbit.

Accessibility and Exploration

1991 JW can be reached with a journey of 362 days. This trajectory would require a delta-v of 7.122 km/s. To put this into perspective, the delta-v to launch a rocket to Low-Earth Orbit is 9.7 km/s. There are 150,606 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 1991 JW.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 1991 JW:

References

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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 1.039 AU
  • Eccentricity: 0.1186
  • Inclination: 8.71°
  • Longitude of Ascending Node: 53.87°
  • Argument of Periapsis: 301.92°
  • Mean Anomaly: 43.32°

Physical Characteristics

  • Diameter: 0.42300 km
  • Magnitude: 19.3
  • Albedo: 0.161

Derived Characteristics

  • Orbit Period: 387 days (1.06 years)
  • Avg. Orbit Speed: 29.21 km/s
  • Aphelion Distance: 1.16 AU
  • Perihelion Distance: 0.92 AU
  • Rotation Period: 3.15 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 207945 (1991 JW) 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 below comparison is an artistic rendering that uses available data on the diameter of 1991 JW to create an approximate landscape rendering with New York City in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.