Near-Earth Object
2021 CX4
NASA ID: 54114201
2021 CX4 will pass Earth on 27 September 2026 at a distance of 164.53 lunar distances (LD) - about 63,243,461 km - travelling at 28,761 km/h. Its estimated diameter is between 47 and 105 metres, roughly the size of a football pitch (around 105 m long). NASA does not classify it as potentially hazardous.
Close Approach Date
27 September 2026
In 5 days
Miss Distance
164.53 LD
63,243,461 km
165 times the Moon's distance from Earth
Velocity
28,761 km/h
1.0 times the orbital speed of the International Space Station
Est. Diameter
47–105 m
Absolute Magnitude
H = 23.77
The brightness measure astronomers use to estimate size
Hazard Classification
Not Hazardous
The real orbit in 3D
The actual path of 2021 CX4 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 CX4 to Earth between 1912 and 2097, 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 →
