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 2019-09-22
2019 SD8 (2019 SD8)
27
watch score
How bigiEstimated from brightness and an assumed albedo. Radar or a spacecraft visit would tighten it.
12m
range 9–20 m
How closeiLD = lunar distance (~384,400 km). The closest the object's path brings it to Earth's centre.
18.6LD
range ≈7,162,671 km
How fastiVelocity relative to Earth at closest approach.
9.5km/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 object12 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.
70 kt
range 30 kt – 324 kt
Where that sits
Hiroshima
Chelyabinsk
Tunguska
Tsar Bomba
At this size and speed it would most likely airburst high in the atmosphere — energy between Hiroshima (Little Boy) (~0.015 Mt) and Chelyabinsk 2013 (~0.45 Mt), shown as a bracket, not a single number.