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 2025-10-28
2025 UK9 (2025 UK9)
51
watch score
How bigiEstimated from brightness and an assumed albedo. Radar or a spacecraft visit would tighten it.
5m
range 3–7 m
How closeiLD = lunar distance (~384,400 km). The closest the object's path brings it to Earth's centre.
0.82LD
range ≈314,648 km
How fastiVelocity relative to Earth at closest approach.
7.7km/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?
This object5 m
Bus12 m
20-storey tower65 m
Stadium250 m
Eiffel Tower330 m
Impact energyiKinetic energy converted to TNT-equivalent, with the size and speed ranges propagated through.
4 kt
range 1 kt – 12 kt
Where that sits
Hiroshima
Chelyabinsk
Tunguska
Tsar Bomba
At this size and speed it would most likely airburst high in the atmosphere — energy less than Hiroshima (Little Boy) (~0.015 Mt), shown as a bracket, not a single number.
Far too faint for the eye or amateur telescopes (mag ≈ 29.8). Tracked by professional surveys only.
Is it on a risk list?
monitored
Listed by the CNEOS / ESA monitoring systems. A listing reflects orbit uncertainty, not an expected impact — odds typically fall toward zero as observations accumulate.