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- In 1923, the 1000th asteroid to be numbered was named 1000 Piazzia in his honor.
- "' 1000 Piazzia "', provisional designation, is a dark asteroid from the outer region of the asteroid belt, approximately 48 kilometers in diameter.
- While the minor planet with number " 1000 ", 1000 Piazzia, honours the discoverer of the first minor planet, Giuseppe Piazzi, number " 2000 " does so for Herschel, discoverer of the first telescopic major planet.