closer to Earth than most of the machines we have placed in orbit
On the evening of January 26, 2023, a small asteroid designated 2023 BU passed within 3,600 kilometers of Earth — closer than many of our own satellites — in one of the nearest approaches ever recorded for a near-Earth object. Discovered only five days prior by astronomer Gennadiy Borisov, the truck-sized rock posed no threat, yet its passage invited a quiet reckoning with how intimately the cosmos brushes against us. What this moment reveals is not peril, but progress: where once such a visitor would have arrived and departed unseen, today we greet it with precise instruments and calm understanding.
- A rock the size of a small truck passed closer to Earth than most orbiting satellites, making it one of the nearest asteroid approaches ever documented.
- Discovered just five days before its flyby, the asteroid's sudden appearance compressed the usual timeline for planetary threat assessment into an urgent, globe-spanning tracking effort.
- NASA's Jet Propulsion Laboratory deployed its Near Earth Asteroid Scout system to rapidly model the trajectory, racing to confirm — or rule out — any collision risk.
- Engineers determined with confidence that 2023 BU would miss Earth entirely, and that even an atmospheric entry would result in complete burnup before any fragment reached the ground.
- Earth's gravity bent the asteroid's path as it passed, a subtle but measurable interaction that underscores how modern detection systems now capture not just the approach, but the gravitational conversation between our planet and its visitors.
On January 26, 2023, an asteroid the size of a small truck passed within roughly 3,600 kilometers of Earth — closer than the orbit of many satellites — marking one of the nearest approaches of any known object ever recorded. NASA confirmed no danger, but the event was extraordinary in its sheer proximity.
The asteroid, designated 2023 BU and measuring between 3.5 and 8.5 meters across, was discovered on January 21 by Gennadiy Borisov at the MARGO observatory in Crimea. Within days, observatories worldwide were tracking it, allowing scientists to build a precise picture of its path and confirm what seemed almost improbable: this small rock would pass closer to Earth than most of the machines humanity has placed in orbit.
NASA's Jet Propulsion Laboratory used its Near Earth Asteroid Scout system to assess the threat and quickly ruled out any collision. Navigation engineer Davide Farnocchia noted that despite limited early observations, the system had identified this as an extraordinarily close approach — among the nearest ever documented. The flyby occurred above the southern tip of South America, and had the asteroid somehow entered the atmosphere, it would have burned up entirely before reaching the ground.
What the moment truly demonstrated was not danger, but capability. Earth's gravity gently bent the asteroid's trajectory as it passed, a measurable interaction that modern instruments captured in full. A visitor that would have gone entirely unnoticed a generation ago was instead tracked, measured, and understood before it arrived — a testament less to cosmic threat than to how far our ability to watch the skies has come.
On the evening of January 26, 2023, an asteroid the size of a small truck will slip past Earth at a distance of roughly 3,600 kilometers—closer than the orbit of many satellites circling the planet. NASA has confirmed there is no danger, but the passage marks one of the nearest approaches of any known object to our world on record.
The asteroid, designated 2023 BU, measures between 3.5 and 8.5 meters across. It was discovered just five days earlier by Gennadiy Borisov, working at the MARGO observatory in Nauchnyi, Crimea, on January 21. Once word of its existence spread, observatories around the globe began tracking it, allowing scientists to build a precise model of its path and confirm what seemed almost unbelievable: this small rock would come closer to Earth than most of the machines we have placed in orbit.
The Jet Propulsion Laboratory at NASA moved quickly to assess the threat. Using their Near Earth Asteroid Scout system—a tool designed to evaluate the danger posed by objects approaching our planet—engineers calculated the asteroid's trajectory with enough confidence to rule out any collision. Davide Farnocchia, a navigation engineer at the lab, noted in a statement that despite limited initial observations, the Scout system had determined this would be an extraordinarily close approach, ranking among the nearest encounters ever documented for a near-Earth object.
The passage will occur on Thursday, January 26, at 4:32 p.m. Pacific Standard Time, or just after midnight Friday morning in Lisbon. The asteroid will pass above the southern portion of South America. If, against all expectations, it were to enter Earth's atmosphere, the friction and heat would destroy it completely before it could reach the ground. There is no scenario in which this object poses a threat to life or infrastructure on the surface.
What makes this event remarkable is not the danger—there is none—but the sheer proximity. The asteroid will travel a path that brings it nearer to Earth than the altitude at which many of our satellites operate. Earth's gravity, though it will not capture the object, will bend its trajectory as it passes, influencing the asteroid's orbit around the sun. This gravitational interaction, combined with the precision of modern detection and tracking systems, demonstrates how thoroughly we now monitor the space around our planet. A rock that might have gone unnoticed a generation ago is now tracked, measured, and understood before it arrives. The close call, in other words, is less a warning than a testament to how far our ability to see has come.
Citações Notáveis
This is one of the closest approaches of a near-Earth object ever documented— Davide Farnocchia, navigation engineer, NASA Jet Propulsion Laboratory
A Conversa do Hearth Outra perspectiva sobre a história
Why does it matter that this asteroid passes closer than our satellites?
Because it shows us the scale of what's actually out there. We think of space as empty, but objects are constantly moving through it. This one happens to come closer than the machines we depend on.
If it's so small, why did it take until January 21 to find it?
Size and distance are different things. An object three meters across is hard to spot from Earth unless you're looking in the right place at the right time. Borisov was watching, and he caught it.
The statement says Earth's gravity will influence its path. Does that mean it could be pulled toward us?
No. Gravity influences everything, but influence isn't the same as capture. The asteroid will feel Earth's pull and its trajectory will bend slightly, but it will keep moving. It's like a ball rolling past a magnet—the magnet affects it, but the ball keeps rolling.
What does it tell us that we can now predict these things so precisely?
That we've built systems to see what's coming. The Scout system didn't just detect this asteroid; it calculated where it would be days in advance. That's new. That's powerful.
Is this the closest anything has ever come?
One of the closest on record. There may have been closer approaches before we had the tools to measure them. But yes, this is among the nearest we've ever documented.