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3I/ATLAS Tracker
Witness History: Follow Comet 3I/ATLAS's Once-in-a-Lifetime Passage
Feb 16, 2026
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YXYuming Xiao
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Product Overview
3I/ATLAS Tracker is a web-based live tracker for the interstellar comet 3I/ATLAS. It shows where the comet is right now using a live telemetry stream and provides essential orbital facts such as its hyperbolic trajectory, perihelion date (October 29, 2025), and key observing distances.
The site also supports planning and learning with an observing guide, a mission timeline that follows the comet’s journey through the solar system, and curated scientific context about interstellar visitors. It’s built for observers who want up-to-date positions and practical guidance, plus readers who want to understand what makes 3I/ATLAS distinct.
Key features
- Live Telemetry Stream with current orbital data including Sun distance, Earth distance, and velocity
- 3I/ATLAS Quick Facts covering classification, discovery timeline, eccentricity (6.3), and perihelion (1.36 AU)
- Interactive orbit visualization and hyperbolic trajectory context for how 3I/ATLAS moves through the solar system
- Observing Guide to help users plan for viewing opportunities based on the comet’s current state
- Journey Through Our Solar System timeline that tracks key events and scientific milestones from discovery to departure
- Latest Updates plus image and video materials to follow the comet alongside the science context
How 3I/ATLAS Tracker works
- 1
Open the live orbit view
The user starts by viewing the site’s live orbit and current telemetry values to see where 3I/ATLAS is right now.
- 2
Check quick facts and coordinates
The user reviews 3I/ATLAS quick facts and essential information like RA/DEC, distances, and velocity for observational context.
- 3
Plan with observing guidance
The user consults the observing guide and the journey timeline to align viewing plans with the comet’s current stage.
Use cases
- An amateur astronomer checks the live stream to confirm the comet’s current RA/DEC and distances before setting up an observing session.
- A backyard observer uses the observing guide and current orbit data to decide when and where to look for 3I/ATLAS during its approach and departure.
- A science-curious reader follows the mission timeline and interstellar-visitor science section to understand why 3I/ATLAS has a hyperbolic trajectory and what that implies.
Who is it for?
The product is designed for astronomy observers—amateur and educational—who want current ephemerides and practical observing guidance for 3I/ATLAS. It also benefits anyone looking for a structured, contextual overview of an interstellar visitor’s journey.