A recently detected asteroid will pass relatively close to Earth this Monday, attracting the interest of astronomers and space agencies worldwide. Even with the narrow cosmic distance, experts stress that the object poses no risk to the planet and will proceed safely along its trajectory through space.
Astronomers are closely monitoring an asteroid known as 2026JH2, a rocky object expected to glide past Earth at an estimated distance of about 91,593 kilometers, roughly 56,900 miles. According to calculations from the European Space Agency, its trajectory will bring it to nearly one quarter of the usual gap between Earth and the moon, placing it among this year’s closest recorded asteroid flybys. Even so, researchers point out that it presents no risk of impact or atmospheric entry.
The asteroid was initially spotted on May 10 by researchers from the Mount Lemmon Survey in Tucson, Arizona, a program among several focused on tracking near-Earth objects, and after being found, it was officially named 2026JH2 and identified as a member of the Apollo asteroid group, which is characterized by orbits that cross Earth’s path around the sun.
According to NASA’s Jet Propulsion Laboratory, the asteroid is expected to make its closest pass shortly before 6 p.m. Eastern Time, and although this moment may seem alarmingly close from a human perspective, astronomers note that events of this kind happen rather frequently across the vast stretches of the solar system.
Why specialists conclude there’s no real cause for concern
Planetary scientists have assured the public that the asteroid poses no danger to Earth, noting it will pass by safely. Richard Binzel, a professor at the Massachusetts Institute of Technology and the creator of the Torino Scale for categorizing asteroid impact hazards, emphasized that objects of comparable size routinely travel between Earth and the moon without generating any problems.
According to Binzel, asteroids comparable in size to a car or small bus routinely travel through Earth’s cosmic neighborhood. The main difference today is that advances in detection technology now allow astronomers to observe many of these objects that previously would have gone unnoticed.
At its nearest approach, 2026JH2 will still lie far beyond the orbital heights used by numerous geosynchronous satellites that enable telecommunications, weather prediction, and broadcasting, and researchers emphasize that the object’s path has been carefully evaluated and does not cross Earth’s trajectory.
Experts believe the asteroid originated in the main asteroid belt between Mars and Jupiter, a region where collisions among rocky objects and Jupiter’s gravitational influence have long been known to push fragments inward, sending material into the inner solar system and giving rise to many of the near-Earth asteroids that astronomers track today.
While the flyby is harmless, the event highlights the crucial role of continuous monitoring in detecting potentially dangerous objects long before they could present any real risk.
The challenge of determining an asteroid’s exact size
Although 2026JH2 has been observed directly, astronomers still cannot determine its precise dimensions, with current scientific estimates suggesting a diameter between 15 and 30 meters—roughly the length of one or two school buses—yet this figure remains uncertain because visible‑light telescopes capture only how bright the object appears.
Patrick Michel, an astrophysicist and research director at France’s National Centre for Scientific Research, explained that an asteroid’s brightness is not a reliable measure of its size, as a large yet low‑albedo object may appear faint, whereas a smaller, highly reflective one can seem much more luminous.
Astronomers can more precisely determine an object’s dimensions when they obtain infrared data, since this kind of observation captures heat signatures that correlate closely with an object’s actual size. Yet conducting infrared studies from Earth is considerably more challenging, so such measurements are usually absent during the initial detection of near‑Earth objects.
Scientists compare the smallest anticipated size of 2026JH2 to the meteor that exploded above Chelyabinsk, Russia, in 2013, an event that unleashed a shockwave across the area, shattering windows and injuring more than 1,000 people. At the higher end of current projections, the asteroid could resemble the object linked to the 1908 Tunguska event in Siberia, which flattened vast expanses of forest.
Researchers note, however, that these comparisons refer solely to scale rather than risk. In contrast to those past events, 2026JH2 is not expected to enter Earth’s atmosphere. Its trajectory ensures a secure distance from the planet, removing any chance of an airburst or ground collision.
Monitoring asteroids in the coming years remains crucial
Scientists are still certain that 2026JH2 poses no immediate threat, though specialists acknowledge that predicting an asteroid’s distant path is naturally challenging, since its orbit can gradually change over time due to gravitational forces from planets and other celestial bodies.
Michel noted that while long-term paths can never be forecast with perfect accuracy, current assessments show that no identified asteroid is expected to pose a significant collision risk in the next century, and planetary defense teams continually monitor thousands of near-Earth objects to detect any possible changes in their trajectories.
The close flyby occurs at a time when planetary radar assets are far more limited than in past years. Jean-Luc Margot, a professor of planetary sciences at the University of California, Los Angeles, explained that the 2020 collapse of the Arecibo Observatory drastically reduced the scientific community’s radar observation capacity, and NASA’s Goldstone radar facility is also currently undergoing major repairs.
Without radar data, astronomers face greater challenges in pinpointing the exact shape, rotation, and trajectory of nearby asteroids, and although optical telescopes provide valuable information, radar instruments allow scientists to develop far more precise representations of an object’s movement and physical properties.
Margot noted that astronomers have detected only a limited number of near-Earth asteroids comparable in size to 2026JH2. Since many of these bodies are quite dim and compact, they typically come to light just days before their closest flybys, becoming visible only when their brightness finally reaches the threshold of survey telescopes.
This limitation has encouraged space agencies and scientific organizations to invest more heavily in asteroid discovery and tracking programs. New observatories and next-generation sky surveys are expected to improve detection rates significantly over the coming years, allowing researchers to build a more complete inventory of nearby objects.
Apophis expected to provide a historic sky event
While 2026JH2 is drawing attention because of its proximity, astronomers are already preparing for a much more remarkable event scheduled for 2029. An asteroid known as Apophis, considerably larger than 2026JH2, is expected to pass even closer to Earth on April 13 of that year.
Scientists estimate that Apophis will pass roughly 32,000 kilometers from Earth, placing it closer than some satellites that circle the planet, and although this approach is remarkably near, astronomers stress that it presents no threat and regard it instead as an exceptional scientific opportunity.
The flyby of Apophis is expected to become one of the most closely observed asteroid encounters in modern history. Unlike 2026JH2, which will remain invisible to the naked eye, Apophis should be visible from parts of Europe, Africa, and the Middle East without the aid of telescopes.
Events like these give researchers crucial chances to examine asteroid composition, motion, and internal properties while further advancing planetary defense measures, and every nearby passage deepens scientific insight into how such bodies act and how humanity might react should an asteroid one day present a real danger.
For now, astronomers say the passage of 2026JH2 serves primarily as a reminder of the dynamic nature of Earth’s cosmic environment. Small asteroids routinely move through the solar system, and thanks to improving technology, scientists are becoming increasingly capable of spotting them before they pass nearby.
A livestream of the asteroid’s approach is expected to be broadcast by the Virtual Telescope Project from observatories in Italy, allowing astronomy enthusiasts around the world to follow the event in real time. Although the asteroid itself will remain far too dim for most people to see directly, the flyby continues to capture public curiosity about the many objects that silently travel through Earth’s neighborhood in space.
