New meteoroid stream confirmed in southern Virginid region traces rocky body breaking down near the Sun
A multinational analysis of more than 235 000 meteors has revealed a previously unconfirmed meteoroid stream in the southern Virginid region. The newly validated stream appears to originate from a rocky object on a Sun-skimming orbit, adding fresh evidence that thermally driven breakdown can supply dust and meteoroids to near-Earth space.
Image credit: Jeff Sullivan
A new meteoroid stream has been confirmed in the southern Virginid region after researchers analyzed 235 271 shower-removed meteors and fireballs recorded by four major all-sky video networks. The study linked 282 meteors to a coherent low-perihelion stream whose orbit carries it to just 0.22 AU from the Sun, placing it in a region where intense solar heating can fracture and erode rocky bodies.
The work, led by Patrick M. Shober and published March 27, 2026, in The Astrophysical Journal, used meteor data from the Global Meteor Network (GMN), Cameras for All-sky Meteor Surveillance (CAMS), European viDeo Meteor Observation Network Database (EDMOND), and SonotaCo Network.
The strongest signal came from GMN, where the most significant excess in meteor-pair similarity reached a local z-score of 6.32, corresponding to a corrected global significance of 5.3σ.
The newly confirmed stream is diffuse rather than tightly concentrated, which helps explain why it was not firmly established earlier despite years of observations. Density-based clustering isolated 282 members, including 243 from GMN, 19 from SonotaCo, 10 from CAMS, and 10 from EDMOND. The stream spans a broad activity window in solar longitude and appears to return annually.
Its combined median orbit places the meteoroids on an asteroidal path with a semimajor axis of 1.29 ± 0.10 AU, eccentricity of 0.83 ± 0.02, inclination of 12.3° ± 1.8°, and Tisserand parameter relative to Jupiter of 4.6 ± 0.3.
The key result is its very small perihelion distance: 0.22 ± 0.01 AU, well inside the orbit of Mercury. At that distance, rocky material is exposed to repeated cycles of extreme heating and cooling that can weaken surface layers, drive cracking, and release debris.
The researchers interpret the stream as consistent with recent thermally driven mass loss from a rocky parent body, a process often described as “rock-comet” activity. Unlike classical comets, which shed dust as surface ice sublimates, rocky near-Sun bodies can lose material through thermal fatigue, dehydration cracking, mineral decomposition, and rapid expansion and contraction during close solar passes.
That interpretation fits a growing body of recent research on how small bodies degrade close to the Sun. Laboratory work published in 2026 found that CI-like asteroid material can break down rapidly under irradiance corresponding to heliocentric distances near 0.2 AU, a range very close to the new stream’s orbit.
Those results support the idea that thermal erosion can supply fresh debris without requiring comet-like ice activity. The stream has been added to the working list maintained by the International Astronomical Union Meteor Data Center under the provisional designation M2026-A1.
The study notes that activity in this region had earlier been associated with a problematic candidate shower entry, but the new analysis is the first to show a statistically robust signal across multiple meteor datasets.
Meteor observations offer one of the most sensitive ways to trace how small bodies shed material, especially when the parent object is inactive, faint, or no longer intact. By tracking weak orbital patterns across hundreds of thousands of meteors, researchers can test how asteroids break apart and how dust is supplied to near-Earth space.
The same study also searched for signs of recent tidal disruption, a process in which close planetary flybys pull apart weak asteroids. That search did not reveal a clear recent tidal-disruption family in the meteor data. Instead, the researchers concluded that any such contribution is likely a very small fraction of the observed shower-removed asteroidal meteoroid population.
The next step is to identify a parent object and model how long the stream has been evolving.
Future surveys, including NASA’s planned NEO Surveyor mission, may improve the chances of finding small low-albedo bodies on similar low-perihelion orbits. For now, the new southern Virginid-region stream offers one of the clearest recent examples of how rocky bodies can quietly shed debris as they pass close to the Sun.
References:
1 Shober, P. M. (2026). Asteroidal activity among meteor datasets: Confirmed new “rock-comet” stream and search for a tidal-disruption signature. The Astrophysical Journal, 1000(2), 254. DOI 10.3847/1538-4357/ae4bde
2 Tsirvouils, G., et al. (2026). Instantaneous thermally-driven erosion can explain dearth of dark near-Sun asteroids. Icarus, 448, 116942. DOI 10.1016/j.icarus.2026.116942
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