Karl A. Augustesen (19 May 1945 – 29 September 2025) was a Danish astronomer and co-discoverer of minor planets.

Working at Brorfelde Observatory, he is credited by the Minor Planet Center with the discovery of six numbered asteroids during 1984–1987.

The Vestian main-belt asteroid 5171 Augustesen, discovered by astronomer and colleague Poul Jensen at Brorfelde Observatory in 1988, was named in his honor.

Augustesen died on 29 September 2025, at the age of 80.

+ Asteroids discovered: 6 3033 Holbaek 5 March 1984 3318 Blixen 23 April 1985 3596 Meriones 14 November 1985 3934 Tove 23 February 1987 5320 Lisbeth 14 November 1985 5321 Jagras 14 November 1985 co-discovered with Poul Jensen co-discovered with Hans Jørn Fogh Olsen

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