New observations highlight the changing nature of Comet 3I/ATLAS as it journeys through our Solar System. The Gemini North telescope in Hawai‘i recently captured these images after the comet reemerged from behind the Sun on December 12, 2025. This data was gathered during a public engagement initiative called “Shadow the Scientists.”
Details on Comet 3I/ATLAS Observations
On November 26, 2025, scientists utilized the Gemini Multi-Object Spectrograph (GMOS) at Maunakea to capture photos of the comet, marking its status as the third-ever detected interstellar object. The new images reveal how the comet has evolved since its closest solar approach.
Location and Discovery
After emerging from behind the Sun, Comet 3I/ATLAS appeared near Zaniah, a triple-star system located in the constellation Virgo. The latest images display a faint green glow, suggesting the presence of gas emissions such as diatomic carbon (C2), a molecule that glows in green wavelengths.
Scientific Insights and Public Engagement
- Led by Bryce Bolin from Eureka Scientific, the initiative incorporates live observations into its outreach efforts.
- The images are produced using exposures through filters—blue, green, orange, and red.
- Background stars appear as colorful streaks due to their relative movement against the fixed position of the comet.
The initiative encourages public involvement in real scientific experiences, aiming to demystify the astronomical research process. Bolin noted that these observing events offer a closer look at significant cosmic phenomena.
Future Monitoring
As Comet 3I/ATLAS continues its exit from the Solar System, astronomers will closely monitor changes in its gas composition and potential outbursts. Many comets exhibit delayed reactions to solar heating, leading to fascinating developments as the comet cools down.
This collaboration is part of NSF NOIRLab’s broader engagement strategy, combining advanced scientific study with outreach to inspire future generations. The data collected during these observing sessions is available for public download from the Gemini Archive, further promoting transparency in the scientific process.
