Asteroid flybys
Asteroid 2026 UB1: when it passes Earth, and how close
Asteroid 2026 UB1 should pass Earth on October 28, 2026, at about 18:07 UTC, 9.52 Moon distances away (about 3,660,000 km, or 2,270,000 miles, from Earth's center), by NASA/JPL's calculation. That's 9.52 times as far as the Moon. It's about 31 to 69 meters (100 to 230 feet) across, judged from its brightness. JPL's orbit for it shows no later flyby within 10 Moon distances before 2200.
Next flyby
Oct 28, 2026
About 18:07 UTC, give or take about 1 hour
How close, in Moon distances
9.52
3,660,000 km (2,270,000 miles)
How big
31 to 69 meters
Likely width, from its brightness
How sure is NASA?
Allowing for what isn't yet known about its orbit, JPL puts this flyby between 9.41 and 9.62 Moon distances from Earth's center, and its timing give or take about 1 hour. It passes at about 18.8 km a second (42,100 miles an hour) relative to Earth.
Every flyby within 10 Moon distances, 1900 to 2200
Oldest first, in JPL's time (within about a minute of UTC). The range is JPL's, allowing for uncertainty in the orbit.
| Date | Moon distances | Range | Km from Earth's center |
|---|---|---|---|
| 9.52 | 9.41โ9.62 | 3,657,381 |
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Source and notes
NASA/JPL Center for Near Earth Object Studies (CNEOS), SBDB Close Approach Data (Public domain (NASA data); credit NASA/JPL-Caltech CNEOS), as of October 22, 2026. Its orbit and details are in JPL's Small-Body Database.
One Moon distance is the Moon's average distance from Earth, about 384,400 km (238,900 miles); distances are measured from Earth's center. JPL works out each flyby from the asteroid's orbit, so flybys before it was found are calculated backward, and its range for a distance shows how sure it is. Orbits are refined as asteroids are observed, so the numbers can change. When nobody has measured an asteroid, its size is estimated from its brightness, assuming it reflects between 5% and 25% of the sunlight that hits it, as NASA does. Asteroids with any known chance of hitting Earth in the next century are on NASA's Sentry list.