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First light (astronomy) - Wikipedia

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First use of a telescope

In astronomy, first light is the first use of a telescope (or new instrument) to capture an astronomical image after construction. This typically follows initial optical tests to align components.^[2]

First light images are usually of limited scientific value due to ongoing instrument calibration, but mark a significant milestone in a telescope's operational timeline.^[3] Key aspects include:

• Technical verification: Tests basic functionality and alignment
• Ceremonial importance: Often celebrated after years of development
• Target selection: Typically features bright, well-known objects for initial testing^{[citation needed]}

• Kepler space telescope (2009): First light image confirmed photometer functionality before exoplanet hunting.^[1]
• James Webb Space Telescope (2022): Captured star 2MASS J17554042+6551277 to test mirror alignment.^[4]
• Palomar Observatory (1949): First light revealed optical issues later corrected in the Hale Telescope.^[5]

• First light (cosmology)

• ESO First Light Gallery
• JWST First Light Procedures

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