These objects are tracked and are NOT on a collision course with Earth. “If it hits” is a hypothetical to show scale.
Near-Earth object · discovered 2021-11-07
2025 WC4 (2025 WC4)
63
watch score
How bigiEstimated from brightness and an assumed albedo. Radar or a spacecraft visit would tighten it.
305m
range 228–511 m
How closeiLD = lunar distance (~384,400 km). The closest the object's path brings it to Earth's centre.
10.2LD
range ≈3,901,841 km
How fastiVelocity relative to Earth at closest approach.
19.1741885013698km/s
range 19.1741885013698–19.1741885013698 km/s
CompositioniInferred from spectral type. Drives whether an impact would airburst or reach the ground.
Stony
range Stony (assumed)
If it hit — a scale comparison, not a forecast
How big is that, really?
Bus12 m
20-storey tower65 m
Stadium250 m
This object305 m
Eiffel Tower330 m
Impact energyiKinetic energy converted to TNT-equivalent, with the size and speed ranges propagated through.
2626 Mt
range 1097 Mt – 12351 Mt
Where that sits
Hiroshima
Chelyabinsk
Tunguska
Tsar Bomba
An object this size would reach the ground and excavate a crater. The figures below are a scale comparison — (2025 WC4) is not on an impact trajectory.