Car-Sized Asteroid 2026 FM3 to Fly Past Earth Closer Than Moon Tonight

A car-sized asteroid designated 2026 FM3 will make a relatively close flyby of Earth late Wednesday, passing at a distance of about 148,000 miles — roughly 60% of the average Earth-moon separation — but posing no risk of impact, NASA officials said.

The asteroid, roughly 15 feet (about 4.5 meters) across, will reach its closest approach at 10:07 p.m. EDT on March 24, or 0207 GMT on March 25, traveling at approximately 12,168 mph (19,580 km/h) relative to Earth. Discovered just days ago, the space rock highlights both the frequency of near-Earth object flybys and the improving capabilities of planetary defense networks to detect them early.

NASA's Jet Propulsion Laboratory in Pasadena, California, tracks thousands of near-Earth objects (NEOs) through its Center for Near-Earth Object Studies. Asteroid 2026 FM3 appears on the agency's "Next Five Asteroid Approaches" list as a car-sized object, underscoring that small bodies routinely pass within lunar distances without threat. For context, the moon orbits Earth at an average of 238,855 miles (384,400 kilometers).

"This is a routine close approach for objects of this size," said a NASA spokesperson. "Asteroids like 2026 FM3 are too small to cause damage even if they were on a collision course, as most would burn up in the atmosphere. Our monitoring systems confirm it will safely pass by."

The asteroid belongs to the Apollo group of near-Earth asteroids, whose orbits cross Earth's path around the sun. Such objects originate primarily from the main asteroid belt between Mars and Jupiter, perturbed over time by gravitational interactions with planets.

At 15 feet wide, 2026 FM3 is comparable in size to a compact car. If it were to enter Earth's atmosphere — which it will not — it would likely produce a bright fireball visible for hundreds of miles but cause no ground damage. Larger objects, roughly 80-100 feet across, are the threshold for potential regional effects, while those exceeding 0.6 miles (1 kilometer) could pose global hazards.

Wednesday's flyby occurs amid heightened public interest in planetary defense. NASA's Double Asteroid Redirection Test (DART) mission in 2022 successfully altered the orbit of a small moonlet, demonstrating that kinetic impactors could deflect hazardous asteroids years in advance. The agency's NEO Surveyor mission, scheduled for launch later this decade, will enhance infrared detection of dark, hard-to-spot objects.

Amateur and professional astronomers may attempt to observe 2026 FM3, though its small size and rapid motion make it challenging for backyard telescopes. At closest approach, the asteroid will appear as a faint, fast-moving point of light requiring precise ephemeris data and dark skies. Professional observatories equipped with larger instruments or radar, such as those at Goldstone or Arecibo's successor facilities, sometimes characterize such objects during close passes.

The discovery of 2026 FM3 came via the Zwicky Transient Facility at Palomar Observatory in California, part of a global network scanning the skies nightly for transient events. Many small asteroids are found only days or weeks before their closest approaches, yet orbital calculations quickly rule out impact risks.

NASA maintains a catalog of more than 35,000 known NEOs, with roughly 2,300 classified as potentially hazardous asteroids (PHAs) — those larger than 460 feet (140 meters) whose orbits bring them within 4.65 million miles (7.5 million km) of Earth. Objects the size of 2026 FM3 fall well below PHA criteria and are monitored primarily for scientific value.

Close approaches like this one provide opportunities to study asteroid composition, rotation and surface properties. Radar observations during flybys can reveal shape, spin rate and even loose rubble-pile structures common among small bodies. Data from such encounters refine models of solar system formation and help assess long-term deflection strategies.

Wednesday's event follows a string of recent small-asteroid flybys. In early March, a bus-sized object designated 2026 EG1 passed about 198,000 miles from Earth, closer than the moon, just days after discovery. Another bus-sized asteroid, 2026 FQ2, made a more distant pass on March 24 at over 1.5 million miles. These frequent encounters demonstrate that Earth resides in a dynamic cosmic neighborhood where small bodies pass harmlessly on a near-weekly basis.

Public fascination with asteroids has grown with missions like OSIRIS-REx, which returned samples from Bennu, and Japan's Hayabusa2 from Ryugu. These primitive bodies contain clues to the solar system's early chemistry and the delivery of water and organic molecules to early Earth.

For skywatchers hoping to catch a glimpse, experts recommend checking astronomy apps or websites providing real-time tracking. However, 2026 FM3's small size and speed mean it will not be visible to the naked eye. Those with moderate telescopes and accurate pointing data might detect it as a streaking dot against background stars.

The flyby occurs as global efforts to catalog and characterize NEOs accelerate. The International Asteroid Warning Network and Space Mission Planning Advisory Group coordinate responses to any future threats. No known asteroid larger than 100 feet poses an impact risk in the next century, according to current assessments.

Scientists emphasize that while Hollywood dramatizations often depict doomsday scenarios, the reality of small asteroid flybys is routine and educational. "These events remind us of the importance of continued vigilance and investment in planetary defense," one astronomer noted. "Most asteroids are benign neighbors, but understanding them helps prepare for the rare larger threats."

As 2026 FM3 speeds past Earth at more than 12,000 mph, it will continue its journey around the sun, returning for future approaches decades or centuries from now. Its brief visit offers a moment to appreciate the vastness of space and the technological prowess allowing detection of objects mere feet across millions of miles away.

NASA and international partners continue refining detection and tracking systems. The Vera C. Rubin Observatory in Chile, set to begin full operations soon, will dramatically increase the discovery rate of NEOs, potentially finding thousands of new objects annually.

For now, residents of Earth can rest easy. The car-sized visitor will zip by harmlessly, a fleeting reminder of the solar system's constant, mostly peaceful motion. Observers with clear skies and proper equipment may catch a scientific thrill, while the rest can simply marvel that humanity can spot and track a car-sized rock hurtling through space from millions of miles away.

After tonight's encounter, attention will shift to the next listed approaches, including additional small objects on March 25. None currently pose any risk, continuing the pattern of safe passages that have protected Earth throughout human history.