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Eugène Joseph Delporte (10 January 1882 – 19 October 1955) was a Belgian astronomer based at the Royal Observatory of Belgium, well known for his contributions to asteroid discovery and for his role in defining modern constellation boundaries. Over his career, he discovered 66 asteroids, including notable ones such as 1221 Amor, the first of the Amor group of near-Earth asteroids, and 2101 Adonis. In 1930, the International Astronomical Union tasked Delporte with formalizing the boundaries of the 88 modern constellations along lines of right ascension and declination for the epoch 1875.0, work which remains the standard today. His precise mapping brought consistency to astronomical charts worldwide. Delporte’s meticulous approach to positional astronomy and his asteroid discoveries made him an important figure in 20th-century observational astronomy.