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Hubble Clarifies Physical Properties of Interstellar Comet 3I/ATLAS

Refined nucleus measurements confirm active dust plumes, paving the way for planned JWST observations and mission studies

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Overview

  • Hubble observations constrain the icy nucleus diameter to between 320 meters and 5.6 kilometers, narrowing previous ground-based estimates
  • The telescope’s images reveal a sunward dust plume and emerging tail, indicating comet-like outgassing behaviors in 3I/ATLAS
  • At roughly 210,000 km/h, it remains the fastest visitor recorded in the Solar System, reflecting billions of years of interstellar gravitational slingshots
  • Upcoming James Webb Space Telescope campaigns, Vera Rubin Observatory surveys and ESA’s Comet Interceptor mission are set to probe its chemical composition and physical characteristics before it recedes
  • Avi Loeb maintains a 6/10 Loeb Scale rating and Congresswoman Anna Paulina Luna urges a Juno mission extension to assess an intercept, keeping artificial-origin theories in play