Near-Earth Object
2021 BN
NASA ID: 54106297
2021 BN will pass Earth on 24 June 2027 at a distance of 97.33 lunar distances (LD) - about 37,413,442 km - travelling at 18,674 km/h. Its estimated diameter is between 6 and 12 metres, roughly the size of a double-decker bus (around 11 m long). NASA does not classify it as potentially hazardous.
Close Approach Date
24 June 2027
In 364 days
Miss Distance
97.33 LD
37,413,442 km
97 times the Moon's distance from Earth
Velocity
18,674 km/h
0.7 times the orbital speed of the International Space Station
Est. Diameter
6–12 m
Absolute Magnitude
H = 28.4
The brightness measure astronomers use to estimate size
Hazard Classification
Not Hazardous
The real orbit in 3D
The actual path of 2021 BN around the Sun, computed from JPL orbital elements. Drag to rotate, scroll to zoom, and use the time controls to run the orbit forwards or back.
Every recorded pass
Each dot is one close approach of 2021 BN to Earth between 1977 and 2064, from JPL's records. Lower means closer: a dot under the dashed line passed nearer than the Moon. The orange dot is the approach on this page.
Size Comparison
Reading the Numbers
- A lunar distance (LD) is the average gap between Earth and the Moon, about 384,400 km. It is the standard yardstick for close approaches. Read more →
- Diameter estimates come from brightness. A dark surface reflects less light than a bright one, so the true size can sit anywhere in the quoted range. Read more →
- Potentially hazardous is a watch-list label based on size and orbital proximity. It does not mean an impact is expected. Read more →
