Near-Earth Object
2021 SB
NASA ID: 54198196
2021 SB will pass Earth on 28 August 2026 at a distance of 157.32 lunar distances (LD) - about 60,474,474 km - travelling at 66,023 km/h. Its estimated diameter is between 16 and 36 metres, roughly the size of a double-decker bus (around 11 m long). NASA does not classify it as potentially hazardous.
Close Approach Date
28 August 2026
In 65 days
Miss Distance
157.32 LD
60,474,474 km
157 times the Moon's distance from Earth
Velocity
66,023 km/h
2.4 times the orbital speed of the International Space Station
Est. Diameter
16–36 m
Absolute Magnitude
H = 26.11
The brightness measure astronomers use to estimate size
Hazard Classification
Not Hazardous
The real orbit in 3D
The actual path of 2021 SB 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.
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 →
