Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 1,404,336 km of Earth in 2021
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

2021 HB2 is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 2021 HB2 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 HB2 orbits the sun every 334 days (0.91 years), coming as close as 0.82 AU and reaching as far as 1.06 AU from the sun. Based on its brightness and the way it reflects light, 2021 HB2 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 HB2's orbit is 0.01 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.

2021 HB2 has 18 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
April 16, 2021 1,404,336 5.953
Oct. 15, 2021 20,849,804 6.844
Aug. 24, 2032 27,277,605 7.343
April 15, 2042 2,268,786 6.159
Oct. 21, 2042 21,096,437 6.826
April 14, 2053 13,907,985 7.621
April 16, 2064 29,804,905 10.208
Sept. 18, 2087 20,026,843 6.728
April 25, 2098 15,295,531 5.506
Sept. 26, 2098 19,079,242 6.669
April 23, 2109 12,788,777 5.463
April 17, 2141 24,930,355 9.403
April 15, 2152 11,864,627 7.354
Nov. 4, 2152 24,097,129 6.879
April 16, 2163 6,008,151 6.589
Oct. 29, 2163 22,181,946 6.809
April 17, 2174 21,835,688 8.867
Nov. 22, 2174 27,615,822 6.693

Images and Observations

2021 HB2's orbit is determined by observations dating back to April 19, 2021. It was last officially observed on April 20, 2021. The IAU Minor Planet Center records 27 observations used to determine its orbit.

Accessibility and Exploration

2021 HB2 can be reached with a journey of 362 days. This trajectory would require a delta-v of 7.086 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 69,509 potential trajectories and launch windows to this asteroid.

See more at the NHATS Mission Trajectories table for 2021 HB2.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 2021 HB2:

References

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Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 0.9413 AU
  • Eccentricity: 0.1278
  • Inclination: 10.38°
  • Longitude of Ascending Node: 207.14°
  • Argument of Periapsis: 227.74°
  • Mean Anomaly: 201.6°

Physical Characteristics

  • Diameter: ~0.010 km
  • Magnitude: 28.34

Derived Characteristics

  • Orbit Period: 334 days (0.91 years)
  • Avg. Orbit Speed: 30.66 km/s
  • Aphelion Distance: 1.06 AU
  • Perihelion Distance: 0.82 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 2021 HB2 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.