The newest cosmic visitor, officially designated 3I/ATLAS, was first spotted hurtling through our solar system on June 21, nearly two weeks before its public discovery.
A newly operational observatory in Chile snagged the first glimpse of an interstellar comet.
- The Vera C. Rubin Observatory captured the first images of interstellar comet 3I/ATLAS on June 21.
- This marks the third known object to visit our solar system from beyond.
- Initial observations suggest 3I/ATLAS is approximately 2 billion years older than our solar system.
- The comet is also traveling faster than previously discovered interstellar objects.
- Rubin Observatory, located in the Chilean Andes, boasts the world’s largest digital camera for astronomy.
In a stroke of cosmic luck, astronomers pointed the brand-new Vera C. Rubin Observatory toward the exact patch of sky where the interstellar object appeared during its commissioning phase. Images captured by the observatory, perched atop a mountain in the Chilean Andes, later revealed the comet in its full glory.
A Glimpse Before the World Knew
Rubin’s observations of 3I/ATLAS were recorded on June 21, about 10 days before its official discovery. This early capture happened during the observatory’s commissioning, an unofficial testing period.
When was the interstellar object 3I/ATLAS first observed? The interstellar object 3I/ATLAS was first observed on June 21.
The Rubin Observatory, overseen by the National Science Foundation and the Department of Energy, boasts the largest digital camera ever built for astronomy. Its car-sized, 3.2-gigapixel camera is designed to capture ultra-high-definition images and videos of the cosmos.
The observatory unveiled its first public images on June 23, showcasing millions of galaxies and stars in the Milky Way. These images not only impressed with their beauty but also revealed supernovas and distant galaxies, offering valuable data for studying the universe’s expansion.
The Interstellar Comet’s Journey
With its revolutionary precision, it’s no wonder the Rubin Observatory captured the comet before any other. 3I/ATLAS was first spotted in data collected by the Asteroid Terrestrial-impact Last Alert System (ATLAS) between June 25 and 29, and again on July 1. By July 2, the Deep Random Survey remote telescope in Rio Hurtado, Chile, had also observed it.
The International Astronomical Union’s Minor Planet Center confirmed on July 2 that this comet originated from outside our solar system, marking the third discovery of an interstellar object. This newcomer joins the ranks of ‘Oumuamua and Comet 2I/Borisov.
Unpacking the Comet’s Secrets
Astronomers are now working diligently to gather as much data as possible on this mysterious object. The Gemini North telescope on Maunakea, Hawaii, recently captured a close-up view of 3I/ATLAS, detailing its coma.
Initial observations suggest 3I/ATLAS is the oldest comet ever found, estimated to be around 2 billion years older than our solar system. It’s also faster than its predecessors. A recent study, still awaiting peer review, found that 3I/ATLAS has a hyperbolic velocity of about 37 miles per second (60 kilometers per second).
Rubin’s early observations are significant as they represent the earliest high-precision images of the comet. The new paper includes 49 images, with 19 captured during intentional operations. These confirm that 3I/ATLAS behaves like a comet, exhibiting a cloud of gas and dust around its icy nucleus.
A Fleeting Encounter
Just as it was the first to spot the comet, Rubin will also be the first to lose sight of it. On August 22, 3I/ATLAS will move out of the observatory’s current viewing area. Until then, the astronomers behind the paper will continue to analyze Rubin’s images for more insights into this interstellar visitor.
