Green Comet C/2024 E1 (Wierzchoś) to Grace Night Skies Before Leaving Solar System Forever

A “green comet” designated C/2024 E1 (Wierzchoś) is lighting up the night sky as it swings past Earth this week. Discovered in March 2024 by Polish astronomer Kacper Wierzchoś using a 1.5‑metre telescope at Arizona’s Mount Lemmon Observatory, the icy body has been studied by the James Webb Space Telescope, which detected large amounts of carbon dioxide in its surrounding coma.

Did You Know? The comet’s nucleus was initially estimated to be about 8.5 miles (13.7 km) across – roughly two‑thirds the length of Manhattan – although a more recent, not‑yet‑peer‑reviewed study suggests this may be an overestimate.

What happened?

The comet originated from the Oort cloud, a distant reservoir of icy bodies at the outer edge of the solar system. Its hyperbolic trajectory means it does not return to orbit the Sun, and this is likely its first foray into the inner solar system. It passed perihelion on 20 January, coming within 52 million miles (84 million km) of the Sun, and will reach its closest approach to Earth on 17 February, at a distance of about 94 million miles (151 million km) – similar to the Sun‑Earth distance.

Why it matters for public health

While the comet poses no direct physical threat, its visibility offers a unique opportunity for community engagement in sky‑watching, which can promote mental well‑being by encouraging outdoor activity and curiosity about the cosmos. However, the comet is not bright enough for naked‑eye viewing; observers need a decent telescope or binoculars. Using proper optical equipment helps prevent eye strain and accidental exposure to bright light sources.

Expert Insight: Samantha Carter notes that organized viewing events around comets like Wierzchoś can foster social cohesion and reduce stress, provided participants use appropriate eye protection and avoid prolonged staring through telescopes without breaks.

What may happen next?

Analysts expect that the comet will eventually be ejected from the solar system after its current solar slingshot, joining interstellar travelers such as 3I/ATLAS. It could take decades or even centuries for it to fully exit the solar system, after which it may drift through the Milky Way for millions of years, occasionally passing through other star systems.

For amateur astronomers, the comet will remain observable from the Northern Hemisphere for a few weeks, best seen above the southwestern horizon after sunset as it moves through the constellation Sculptor. Observers in the Southern Hemisphere will have an easier view.

Frequently Asked Questions

Can I see comet C/2024 E1 (Wierzchoś) with the naked eye?

No. The comet is not bright enough for naked‑eye observation; a decent telescope or binoculars are required.

How large is the comet’s nucleus?

Initial JWST data suggested a diameter of about 8.5 miles (13.7 km), but a newer, un‑peer‑reviewed study indicates this may be an overestimate.

When will the comet be closest to Earth?

The closest approach to Earth is scheduled for 17 February, when it will be roughly 94 million miles (151 million km) away.

Will you be looking up at the night sky to catch a glimpse of this green comet?