The International Astronomical Union has now recognized two previously unknown annual meteor showers, both connected to comets that have never been seen. The confirmation appeared in the November 2026 edition of eMetN Meteor Journal, raising the total count of established meteor showers to over 113. These findings show Earth crosses invisible debris trails twice every summer, a phenomenon that went unnoticed until the Global Meteor Network (GMN) identified them.
The first shower, labeled M2026-R1, reaches its peak around July 18 and originates from the constellation Cetus, the mythical sea monster. Its meteors streak across the sky at 63.5 km/s (39.5 miles per second), fast enough to create brief, bright flashes. Researchers confirmed 49 members of this shower using data from 98 cameras spread across 9 countries. Its orbital path—with an eccentricity near 0.920 and a retrograde trajectory—matches the behavior of Halley-type comets, which move opposite to Earth’s orbit. However, no matching comet appears in the JPL Small Body Database.
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The second discovery, M2026-S1, is stronger but remains subtle. It peaks around August 19 from the constellation Camelopardalis, the giraffe, near the north celestial pole. The GMN’s 554 cameras detected 198 confirmed members, with the shower active for roughly four days. Its orbital traits, an inclination of about 100° and a perihelion distance of 0.94 AUPerseids, produced by comet 109P/Swift-Tuttle, the two showers are unrelated. No known comet accounts for the debris trail behind M2026-S1.
How the Global Meteor Network Hunts Hidden Showers
When two or more cameras capture the same meteor, software calculates its 3D path by triangulation. Over time, clusters of meteors with matching orbits reveal showers. Statistical tests then eliminate the possibility of random occurrences. For M2026-S1, the chance of the observed meteors being random stood at 5 × 10⁻⁸, confirming a near-certain discovery.
Both newly confirmed showers share a key feature: their parent comets, if they exist, are likely inactive or too faint to detect. Halley-type comets, with orbital periods of 20 to 200 years, are difficult to spot unless they near the Sun. The two showers imply at least two more such comets remain undiscovered, though their debris trails reveal their presence annually.
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Since its launch in 2018, the GMN has identified 418 showers, many without known sources. As the network expands, additional hidden comets may be uncovered through their orbital signatures alone. The two confirmed showers suggest Earth encounters more meteor streams each year than previously recognized, and far more remain unknown.
IAU’s Strict Rules for Confirming New Meteor Streams
The IAU’s formal registration of M2026-R1 and M2026-S1 in the November 2026 issue of eMetN Meteor Journal followed a strict review outlined in a companion paper. The methodology explains how the GMN team applies the Drummond D criterion, a statistical tool for measuring orbital clustering, to separate real showers from random meteor activity. For both discoveries, the team cross-checked years of data to verify consistent radiant positions, speeds, and orbital characteristics. The probability of M2026-S1’s 198 meteors occurring by chance was calculated at 5 × 10⁻⁸, well below the threshold for false detections. Similar validation was applied to M2026-R1, though its narrower active period and smaller member count required extra checks to rule out background noise.
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By late 2025, the GMN had recorded 2,847,823 calibrated meteor orbits since its founding. Each detection requires at least two cameras to capture the same event, enabling precise triangulation of meteoroid trajectories. The network’s global coverage, spanning 45 countries, allows continuous monitoring, though gaps remain in regions like Antarctica, where no cameras operate. The team has noted that underrepresented areas could reveal additional showers if equipped with GMN stations. For example, M2026-S1’s northern radiant benefits from cameras in high-latitude locations, while M2026-R1’s southern radiant in Cetus depends on Southern Hemisphere stations.
Orbital Clues Point to Two Lost Comets
The Halley-type classification for both showers is based on their orbital traits, particularly their Tisserand parameters relative to Jupiter, which fall below zero, a signature of long-period comets. M2026-R1’s orbit, with an inclination of 128.7° and perihelion at 1.012 AU, aligns with comets like 1P/Halley, which produce the Eta Aquariids and Orionids. Similarly, M2026-S1’s parameters, an inclination of about 100°, perihelion between 0.936 and 0.945 AU, and eccentricity of 0.910–0.940, place it in the same category. Despite these similarities, neither shower’s orbit matches any known Halley-type comet in the JPL database, reinforcing the likelihood of two undiscovered parent bodies.
