Key Facts

  • Classified as a Apollo-class Asteroid
  • Comparable in size to a school bus
  • Will pass within 5,301,564 km of Earth in 2039
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

2018 NJ is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2018 NJ 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 collision.

2018 NJ orbits the sun every 698 days (1.91 years), coming as close as 1.01 AU and reaching as far as 2.07 AU from the sun. Based on its brightness and the way it reflects light, 2018 NJ is probably between 0.05 to 0.20 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus.

Close Approaches

2018 NJ's orbit is 0.00 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.

2018 NJ has 6 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Aug. 3, 2039 5,301,564 5.887
May 23, 2041 62,967,749 18.116
Sept. 16, 2060 52,856,770 15.954
June 22, 2062 8,646,188 7.394
Sept. 24, 2081 73,025,915 19.937
May 22, 2085 65,655,040 18.683

NASA Sentry has assessed impact risk for 17 very close approach scenarios. Here are the top scenarios ordered by probability of impact:

Date Distance from Earth (km) Distance Error (km) Probability of Impact (%) Impact Energy (Mt)
July 10, 2083 3,145.80 ±0.31 0.15450 0.02036
July 10, 2110 6,021.96 ±0.32 0.00133 0.02039
July 10, 2116 359.52 ±0.33 0.00084 0.02039
July 10, 2114 70.62 ±0.59 0.00072 0.02039
July 10, 2100 5,386.38 ±0.30 0.00035 0.02035
July 9, 2094 1,553.64 ±0.28 0.00015 0.02037
July 10, 2115 5,694.54 ±0.30 0.00014 0.0204
July 10, 2110 2,715.66 ±0.35 0.00009 0.02039
July 10, 2107 5,392.80 ±0.29 0.00006 0.02038
July 10, 2111 6,118.26 ±0.29 0.00006 0.02035
July 9, 2099 1,771.92 ±0.26 0.00004 0.02039
July 9, 2100 969.42 ±0.49 0.00004 0.02037
July 9, 2088 2,831.22 ±0.23 0.00003 0.02039
July 9, 2090 5,842.20 ±0.27 0.00002 0.02038
July 9, 2095 2,734.92 ±0.26 0.00002 0.02037
July 10, 2102 937.32 ±0.26 0.00002 0.02039
July 10, 2111 2,953.20 ±0.29 0.00001 0.02037

Images and Observations

2018 NJ's orbit is determined by observations dating back to July 5, 2018. It was last officially observed on Aug. 10, 2018. The IAU Minor Planet Center records 38 observations used to determine its orbit.

Accessibility and Exploration

2018 NJ can be reached with a journey of 378 days. This trajectory would require a delta-v of 10.72 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 498 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2018 NJ.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2018 NJ:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.53966504649 AU
  • Eccentricity: 0.3445970564
  • Inclination: 4.67388937717°
  • Longitude of Ascending Node: 107.750001127°
  • Argument of Periapsis: 192.870367275°
  • Mean Anomaly: 144.385830032°

Physical Characteristics

  • Diameter: ~0.12 km
  • Magnitude: 27.9

Derived Characteristics

  • Orbit Period: 698 days (1.91 years)
  • Avg. Orbit Speed: 24.00 km/s
  • Aphelion Distance: 2.07 AU
  • Perihelion Distance: 1.01 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 2018 NJ 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.