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Comet Hale-Bopp (Johannes-Kepler Observatory)

Comet Hale-Bopp begins as a bright white coma region at the bottom center. A white dust tail extends into a rough isosceles triangle all the way to the top. It begins opaque and becomes transparent. A second bright blue gas tail begins at the same place at the bottom of the image near the coma but streams out toward the top left. The black background of space is speckled with tiny yellow dots, which are stars.

Scientists using Webb plan to observe a “target-of-opportunity” comet, one that is not yet known but is expected to be discovered in the first year of the telescope’s mission. If they are lucky, perhaps they might capture an interstellar comet, or perhaps they will train Webb on a comet similar to Hale–Bopp, shown above in a ground-based photo shortly after passing perihelion in April 1997. Comet Hale–Bopp, thought to be from the Oort Cloud, was one of the brightest comets seen for many decades. Visible to the naked eye for a record 18 months, it could be seen even from major cities with light-polluted skies.

Image is available under Creative Commons CC-by-SA 3.0. E. Kolmhofer, H. Raab; Johannes-Kepler-Observatory, Linz, Austria.

About the Data

  • Data Description
    Data DescriptionProposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
    Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.
    Ground-based photograph
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    Comet Hale-Bopp (C/1995 O1)
  • Object Description
    Object DescriptionThe type of astronomical object.
    Comet
  • Release Date
    September 25, 2019
  • Science Release
    NASA’s Webb to Unlock the Mysteries of Comets and the Early Solar System
  • Credit
    Image: Erich Kolmhofer (Johannes-Kepler Observatory), Herbert Raab (Johannes-Kepler Observatory)

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Details

Last Updated
Aug 28, 2025
Contact
Media

Laura Betz
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
laura.e.betz@nasa.gov

Image Credit

Erich Kolmhofer (Johannes-Kepler Observatory), Herbert Raab (Johannes-Kepler Observatory)