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1. A rare green glow is rising in the night sky.
2. A massive comet packed with carbon dioxide is sweeping through the inner solar system for what scientists believe may be the first and last time.
3. And within days, it will reach its closest point to Earth before beginning a long, irreversible departure that could send it into interstellar space — much like 3I/ATLAS.

A newly brightening city-size comet rich in carbon dioxide makes its closest Earth approach February 17 as scientists say it may be permanently ejected into interstellar space.

[USA HERALD] - Comet C/2024 E1, widely known as Comet Wierzchoś, is rapidly brightening as it approaches its February 17, 2026 closest approach to Earth. Discovered in March 2024 by Polish astronomer Kacper Wierzchoś using a 1.5-meter telescope at Arizona’s Mount Lemmon Observatory, the comet has since drawn the attention of major observatories — including the James Webb Space Telescope.

According to observational data released from Webb, the comet’s surrounding coma contains significant quantities of carbon dioxide. In plain terms, the icy nucleus is actively releasing CO₂ gas as it warms near the Sun. That matters because carbon dioxide is one of the more volatile compounds trapped inside primordial comets — material that has remained frozen since the early formation of the solar system.

Initial analysis of telescope measurements suggests the comet’s nucleus spans approximately 13.7 kilometers (8.5 miles) in diameter. That makes it roughly two-thirds the length of Manhattan — large enough to qualify as a substantial Oort Cloud body, not a minor fragment.

Astronomers classify Comet Wierzchoś as hyperbolic, meaning its orbit is open rather than closed. Unlike periodic comets such as Halley’s Comet, which repeatedly loop around the Sun, a hyperbolic comet follows a trajectory that does not bring it back. According to publicly available orbital models, its path suggests it originated in the distant Oort Cloud — a vast spherical reservoir of icy bodies at the outer edge of our solar system — and is now receiving a gravitational slingshot that may permanently expel it.

The comet reached perihelion — its closest point to the Sun — on January 20, 2026, at a distance of roughly 84 million kilometers from the solar surface. On February 17, it will pass approximately 151 million kilometers from Earth, a distance comparable to Earth’s average separation from the Sun. There is no impact threat.

But its trajectory is what captures scientific interest.

Orbital solutions reported through public tracking databases show the comet’s eccentricity exceeds 1.0 — the mathematical threshold for escape velocity from the solar system. While it may take decades or centuries to fully exit the Sun’s gravitational sphere of influence, current modeling suggests it will not return.

In that respect, it mirrors the fate of 3I/ATLAS, the interstellar visitor that dominated astronomical headlines last year after being identified as an object not gravitationally bound to our Sun. While 3I/ATLAS entered our system from interstellar space, Comet Wierzchoś appears poised to do the opposite — becoming an outbound wanderer.

What makes this object visually striking is its emerald coma. Astrophotographers have captured images showing a vivid green glow surrounding the nucleus.

Comet C/2024 E1 (Wierzchoś) captured during its brightening phase as it approaches Earth in early 2026. The green coma is likely linked to carbon-bearing compounds excited by solar radiation.

Scientists generally attribute the green coloration in comets to diatomic carbon (C₂) molecules that fluoresce under ultraviolet sunlight. While carbon dioxide itself is colorless, CO₂ sublimation may contribute to releasing carbon-bearing compounds that generate the distinctive hue. Researchers have not yet published a definitive breakdown of the emission mechanisms in this specific case.

Importantly, the comet will not become visible to the naked eye under most conditions. Observers in the Northern Hemisphere can locate it above the southwestern horizon after sunset, particularly as it passes through the constellation Sculptor. Stargazing binoculars or moderate telescopes significantly improve visibility. Southern Hemisphere observers may have better viewing geometry in the coming weeks.

Beyond the spectacle, there is scientific value.

Oort Cloud comets are considered deep-freeze archives from the early solar system. Carbon dioxide abundance offers clues about the temperature and chemical conditions that existed when the solar nebula formed over 4.5 billion years ago. If confirmed in large quantities, the CO₂ signature could help refine models of volatile distribution in the outer protoplanetary disk.

There is also broader context.

Astronomers are increasingly identifying dynamic, high-energy cometary pathways that either inject objects inward or eject them outward. The forthcoming observational power of the Vera C. Rubin Observatory is expected to accelerate such discoveries, potentially identifying more outbound bodies — and perhaps the next inbound interstellar visitor.

2026 is already shaping up as a notable year for comet tracking. Additional objects, including C/2026 A1 (MAPS) and C/2025 R3 (PanSTARRS), are under observation, with some projections suggesting they could reach binocular or even naked-eye visibility if conditions align.

From a planetary defense standpoint, hyperbolic comets are not inherently dangerous, but they are dynamically complex. Their velocities and unpredictable outgassing can slightly alter trajectories. Continued tracking ensures that orbital solutions remain precise.

In my assessment, the larger takeaway is this: our observational network is improving, but these objects remind us that the solar system remains far from static. Massive bodies still arrive from the outermost fringes — and sometimes leave entirely.

Comet Wierzchoś is not a threat. It is, however, a reminder that gravitational boundaries are permeable — and that interstellar space is not an abstract concept, but a destination some objects inevitably reach.

By late 2026 and beyond, the green glow will fade, the tail will dissipate, and the comet will dim into darkness. What remains will be orbital data, chemical signatures, and a growing understanding of how material moves between star systems.

That knowledge may prove far more enduring than the spectacle itself.

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