A basketball-court-sized asteroid discovered just eight days ago is making one of the closest flybys ever recorded for an object of its class today, May 18, passing within 57,000 miles (91,000 kilometers) of Earth — less than a quarter of the distance to the Moon and closer than a handful of operational spacecraft. The Virtual Telescope Project is streaming the encounter live, free, starting at 3:45 PM EDT, with closest approach at 5:23 PM EDT. After tonight, 2026 JH2 will not come this close to Earth again until the year 2060.
There is no impact risk. Astronomers at NASA's Center for Near-Earth Object Studies have confirmed the trajectory, and at 57,000 miles the asteroid remains well outside any collision path. What makes today's event scientifically significant is the combination of distance, size, and detection window: a rock comparable to the one that exploded over Russia in 2013 and injured roughly 1,500 people was spotted only eight days before its closest recorded approach.
Mount Lemmon Survey Found It Eight Days Before Closest Approach
Asteroid 2026 JH2 was discovered on May 9–10 by astronomers Joshua Hogan and Alessandra Serrano operating the Mount Lemmon Survey telescope in Arizona, part of the Catalina Sky Survey — the most prolific near-Earth object detection program in history, credited with more than 25,000 minor planet discoveries. The object was initially so faint — apparent magnitude 21, near the limit of detection — that follow-up observations from Steward Observatory, Farpoint Observatory, and Magdalena Ridge Observatory were needed to confirm its orbit and classify it as an Apollo-class near-Earth object on May 12.
Based on its brightness and estimated surface reflectivity, NASA's Jet Propulsion Laboratory puts the asteroid's diameter between 15 and 35 meters — roughly the length of an adult blue whale or a standard basketball court. That size range puts it in the same class as the Chelyabinsk meteor, which was about 20 meters across when it exploded over Russia on February 15, 2013, releasing energy equivalent to 440,000 tons of TNT and sending approximately 1,500 people to seek medical treatment, mostly from shattered glass.
At its closest approach tonight, 2026 JH2 will be traveling at approximately 19,417 mph (31,248 km/h) relative to Earth. That velocity and proximity will make it bright enough to track with a small amateur telescope — peaking at around magnitude 11.5 — though it will not be visible to the naked eye under any conditions.
How to Watch: Free Livestream From Italy Starting at 3:45 PM EDT
The Virtual Telescope Project will broadcast the flyby live from robotic telescopes at Manciano, Italy, run by astronomer Gianluca Masi. The feed starts at 3:45 PM EDT (19:45 UTC), approximately 100 minutes before closest approach at 5:23 PM EDT. No subscription, equipment, or technical background is required — only a browser.
"At the time of the observation, the object will be moving pretty fast against the stars, but our advanced telescopes will precisely track 2026 JH2 while it will be almost at its minimum distance from us, peaking in brightness," Masi told Space.com. The observatory will lock onto the asteroid as a moving point of light while background stars trail behind — a viewing geometry that makes the asteroid's motion directly visible in near real time.
For those with access to a telescope of 6 inches or larger and dark skies, 2026 JH2 will be trackable in the southern sky near the constellation Leo. Stargazing apps including Stellarium will require a database update to include the newly catalogued object.
The Detection Window Is the Story
The more significant number in today's event is not 57,000 miles — it is eight days. That is how much warning time the planetary defense network had for an object the size of the Chelyabinsk impactor passing at one of the closest recorded distances for any near-Earth asteroid in this size class.
That eight-day window is not a failure of the detection systems — it is, in an important sense, a demonstration of them. A decade ago, an object this small and faint, approaching from a difficult sky position, might have gone entirely unnoticed. The Catalina Sky Survey, NASA's ATLAS network, and the Vera C. Rubin Observatory — which launched its real-time alert system in February 2026 and has already catalogued more than 11,000 previously unknown asteroids — represent a measurable advance in detection capability.
But the same infrastructure has documented limits. A February 2026 study published on arXiv found that Rubin Observatory alone will miss more than half of dangerous asteroids before impact, with warning times potentially measured in days rather than years for fast-approaching small objects. The detection gaps exist primarily for objects approaching from the direction of the Sun — a blind spot for ground-based optical telescopes — and for objects small enough to remain faint until they are already close.
2026 JH2 approached from an angle that made it detectable eight days out. The next Chelyabinsk-class object might not.
What Happens After Tonight
After passing Earth at 5:23 PM EDT, 2026 JH2 will begin a 3.8-year elliptical orbit that takes it out toward Jupiter before looping back toward the inner solar system. Its next notable close approach to Earth is not projected until 2060, when it will pass at approximately 17 times the lunar distance — roughly 6.5 million miles, posing no threat and offering no viewing opportunity comparable to today's.
NASA's Planetary Defense team tracks more than 35,000 known near-Earth objects, but models suggest hundreds of thousands remain uncharted. Every close flyby like today's provides an opportunity to refine the object's orbital parameters and improve models of the broader near-Earth population — data that, if a genuinely threatening object were ever detected, would inform the deflection window available to respond.
NASA's DART mission demonstrated in 2022 that a spacecraft collision can meaningfully alter an asteroid's trajectory. That technique, however, requires years of lead time. The bottleneck is not deflection — it is detection.
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