An asteroid discovered days ago will narrowly miss Earth

An asteroid discovered days ago will narrowly miss Earth

An asteroid discovered days ago will – On Monday, an asteroid measuring approximately the size of a school bus or two will pass by Earth, approaching within 91,593 kilometers (56,913 miles), as noted by the European Space Agency. This distance is roughly one-quarter of the average separation between our planet and the moon. The celestial body, cataloged as 2026JH2, was first identified by researchers at the Mount Lemmon Survey in Tucson, Arizona, on May 10. Its classification as an Apollo asteroid highlights its orbital path, which overlaps with Earth’s trajectory around the sun, making such close encounters relatively common in the solar system.

A rare cosmic event

The impending flyby of 2026JH2 is expected to occur just before 6 p.m. ET, according to NASA’s JPL Small-Body Database. While the proximity might seem alarming, experts emphasize that the object poses no immediate threat. Richard Binzel, a planetary sciences professor at MIT and creator of the Torino Scale, explained that the event is a typical occurrence. “This is actually a rather normal occurrence,” he stated in an email. “Car-sized objects pass between the Earth and Moon every week, and those measuring the size of a school bus traverse our neighborhood several times annually.”

Binzel noted that modern asteroid surveys have significantly improved our ability to detect such objects. “Before these advanced systems, space rocks of this size would simply glide past unnoticed,” he added. The discovery of 2026JH2 underscores the progress in tracking near-Earth objects, which has become crucial for planetary defense initiatives. Despite this, the asteroid’s exact dimensions remain uncertain, as its size is determined through observations of luminosity, a factor influenced by both its reflectivity and actual mass.

Understanding the asteroid’s size

Patrick Michel, an astrophysicist at the National Centre for Scientific Research in France, highlighted the challenges in estimating 2026JH2’s size. “When optical telescopes detect a new object, they only capture its visible light output,” he said in an email. “This means we can’t determine how much light it absorbs or reflects.” Michel clarified that the same luminosity could correspond to a larger, darker asteroid or a smaller, brighter one. “To accurately measure size, infrared observations are necessary,” he explained. “However, these are more complex to conduct from Earth and aren’t typically used for initial discoveries.”

Based on current assumptions about reflectivity, 2026JH2 is estimated to range between 15 and 30 meters (49 and 98 feet) in diameter. At the smaller end, it would resemble the size of the Chelyabinsk meteor, which exploded in the atmosphere in 2013, causing widespread damage. At the larger end, it would be comparable to the Tunguska event of 1908, where a massive object devastated a vast forest area in Siberia. However, unlike these historical incidents, 2026JH2 will not enter Earth’s atmosphere, eliminating any risk of an explosive entry.

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While the asteroid’s trajectory is currently safe, its path remains subject to slight variations. Michel acknowledged that predicting its future course is complex, as gravitational interactions with planets and other celestial bodies could alter its trajectory over time. “We can’t entirely eliminate the possibility it might one day collide with Earth,” he said. “But for the foreseeable future, it’s far enough that there’s no cause for concern.”

Experts also pointed out that the 2026JH2 event is not unique in the context of astronomical phenomena. “Such close approaches are frequent, but they are often overlooked until they become significant,” said Binzel. The asteroid’s origin is linked to the asteroid belt, a region between Mars and Jupiter where countless objects orbit the sun. “Collisions in this belt, combined with Jupiter’s gravitational influence, can propel smaller asteroids into Earth’s vicinity,” Binzel explained. “This process has been recognized for decades, and thousands of potential near-Earth threats are already documented.”

Comparing celestial threats

Even though 2026JH2 will come within striking distance, another asteroid, Apophis, is set to make a closer approach in 2029. Apophis, which is at least 10 times larger than 2026JH2, will pass within 32,000 kilometers (19,883 miles) of Earth on April 13 of that year. Michel noted that this event will be more remarkable. “Such a close pass by a large object is a rare occurrence, happening only once every few thousand years,” he said. “Its light will even be visible to the naked eye, which is a fascinating sight.”

Despite the proximity, Michel reassured that the event will not be cause for panic. “We are not worried at all, and on the contrary, we are very excited,” he added. The contrast between 2026JH2 and Apophis illustrates the spectrum of asteroid threats. While 2026JH2’s path is clear, Apophis’s trajectory is under continuous scrutiny. “So far, no known asteroid poses a risk for the next century,” Michel said. “But we remain vigilant, as even minor changes in trajectory could alter future outcomes.”

Experts also emphasized the importance of ongoing observation. “The more we study these objects, the better we can predict their behavior,” Binzel stated. The Mount Lemmon Survey, which identified 2026JH2, plays a vital role in monitoring near-Earth objects. “Without these surveys, we’d miss many of the smaller asteroids that could potentially impact our planet,” he added. The data collected not only helps track current threats but also enhances our understanding of cosmic dynamics.

Historical context and future implications

The Chelyabinsk and Tunguska events serve as reminders of the potential dangers posed by asteroids. The 2013 Chelyabinsk meteor, which was about 15 meters in size, exploded with the force of 500 kilotons of TNT, equivalent to a small nuclear bomb. Similarly, the 1908 Tunguska object was estimated to be over 50 meters in diameter and released energy comparable to a megaton of TNT. While these events were catastrophic, 2026JH2’s approach, though closer, is a far less dangerous encounter.

Michel also drew attention to the significance of the Torino Scale, a tool developed by Binzel to assess the risk of asteroid impacts. “The Torino Scale provides a framework for understanding potential threats,” he said. “It ranges from zero to ten, with ten indicating a certain collision.” The current risk level for 2026JH2 is low, but its passage highlights the importance of such scales in communicating the likelihood of future events.

In conclusion, the flyby of 2026JH2 is a testament to the advancements in astronomical technology and the growing awareness of cosmic threats. While the asteroid’s size and proximity may spark interest, it will pass safely, offering a unique opportunity to study its characteristics. As Michel observed, “These events are not only fascinating but also critical for refining our models of asteroid behavior.” The continued monitoring of such objects ensures that we can better prepare for any future encounters, whether they are routine or potentially hazardous.