Interstellar Comet 3I/ATLAS: Drastic Changes Ahead of Earth Approach
- This article provides an evergreen resource on the interstellar comet 3I/ATLAS, tracking its journey and recent activity.
- Comet 3I/ATLAS is an interstellar comet, meaning it originated outside our solar system.It was discovered in early 2023 by the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescopes in...
- New images captured on November 26, 2023, by the Gemini North telescope on Mauna Kea, Hawaii, reveal that 3I/ATLAS has become substantially brighter and exhibits a distinct greenish...
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Interstellar Comet 3I/ATLAS Brightens and Turns Green Ahead of Earth Approach
Table of Contents
Updated as of December 14, 2023, at 00:14:13 UTC. This article provides an evergreen resource on the interstellar comet 3I/ATLAS, tracking its journey and recent activity.
What is Comet 3I/ATLAS?
Comet 3I/ATLAS is an interstellar comet, meaning it originated outside our solar system.It was discovered in early 2023 by the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescopes in Hawaii and south Africa Space.com. Unlike most comets which orbit the Sun within our solar system, 3I/ATLAS is on a hyperbolic trajectory, indicating it’s only passing through.
Recent Observations: Brightening and a Green Hue
New images captured on November 26, 2023, by the Gemini North telescope on Mauna Kea, Hawaii, reveal that 3I/ATLAS has become substantially brighter and exhibits a distinct greenish glow NOIRLab. This activity follows its closest approach to the Sun (perihelion) on September 27, 2023.
As the comet neared the Sun, the intense solar radiation caused the ices on its surface to sublimate - transitioning directly from solid to gas. This process released vast amounts of dust and gas, creating a bright coma (the cloudy atmosphere surrounding the comet) and a long, glowing tail. The recent brightening indicates an increase in this sublimation rate.
The newly observed green hue is attributed to the emission of light from diatomic carbon (C2) gas. This gas wasn’t readily visible in earlier observations, suggesting it’s a relatively recent development linked to the increased solar heating.
The Significance of Diatomic Carbon (C2)
The presence of diatomic carbon is notably engaging to astronomers. C2 is a fragile molecule that breaks down easily when exposed to ultraviolet radiation from the Sun. Its detection in 3I/ATLAS suggests the comet originated in a region of space wiht a different radiation environment than our solar system NASA JPL. This provides valuable clues about the conditions in the comet’s birthplace.
Furthermore, the abundance of C2 can help scientists understand the composition of the comet’s nucleus - the solid, icy core. Different types of ices and dust within the nucleus release different gases when heated, allowing astronomers to infer the comet’s original building blocks.
Timeline of 3I/ATLAS
| Date | Event |
|---|---|
| Early 2023 | comet 3I/ATLAS discovered by ATLAS telescopes. |
| September 27, 2023 | Perihelion (closest approach to the sun). |
| November 26, 2023 | Gemini North telescope captures images showing increased brightness and green hue. |
| Late September 2023 | Expected
|