Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 254,626 km of Earth in 2021
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation


2021 OD1 is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 2021 OD1 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.

2021 OD1 orbits the sun every 278 days (0.76 years), coming as close as 0.61 AU and reaching as far as 1.06 AU from the sun. Based on its brightness and the way it reflects light, 2021 OD1 is probably between 0.004 to 0.017 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

Close Approaches

2021 OD1'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.

2021 OD1 has 6 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
July 31, 2021 254,626 7.880
June 11, 2024 28,726,461 8.489
July 23, 2037 9,507,774 6.873
Aug. 3, 2050 13,941,926 9.798
July 1, 2053 20,559,503 7.043
Aug. 1, 2066 1,383,372 7.857

Images and Observations

2021 OD1's orbit is determined by observations dating back to July 30, 2021. It was last officially observed on July 31, 2021. The IAU Minor Planet Center records 29 observations used to determine its orbit.

Accessibility and Exploration

2021 OD1 can be reached with a journey of 362 days. This trajectory would require a delta-v of 10.938 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 169 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2021 OD1.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2021 OD1:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 0.8346 AU
  • Eccentricity: 0.27
  • Inclination: 11.35°
  • Longitude of Ascending Node: 127.85°
  • Argument of Periapsis: 332.37°
  • Mean Anomaly: 145.39°

Physical Characteristics

  • Diameter: ~0.010 km
  • Magnitude: 28.27

Derived Characteristics

  • Orbit Period: 278 days (0.76 years)
  • Avg. Orbit Speed: 32.66 km/s
  • Aphelion Distance: 1.06 AU
  • Perihelion Distance: 0.61 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 2021 OD1 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.