stereocomparator

astronomical instrument

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Last updated

July 14, 2026

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A stereocomparator is an astronomical instrument used to detect subtle changes in celestial objects by comparing photographs of the same area of the sky taken at different times. It functions as a stereoscope, allowing for the accurate comparison of these images. This comparison can reveal small motions or variations in brightness, aiding astronomers in their observations. The term originates from the Greek word "stereos," meaning solid or three-dimensional, and "comparator," meaning one that compares.1

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Max Wolf
…the first to use the stereocomparator (a type of stereoscopic viewer), which greatly helps in the discovery and identification of variable or moving objects in celestial photographs. In 1906 he discovered Achilles, the first of the Trojan planets, two groups of asteroids that move around the Sun in Jupiter’s orbit:…
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…the first to use the stereocomparator (a type of stereoscopic viewer), which greatly helps in the discovery and identification of variable or moving objects in celestial photographs. In 1906 he discovered Achilles, the first of the Trojan planets, two groups of asteroids that move around the Sun in Jupiter’s orbit:…
Read More