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Together with Adalbert Krüger and Eduard Schönfeld , he was responsible for the star catalogue known as the Bonner Durchmusterung, published between 1852 and 1859, which gave the positions and brightness of more than 324,000 stars, although it did not cover much of the southern half of the sky.
He won the Gold Medal of the Royal Astronomical Society in 1863Events January-March January 1 Abraham Lincoln delivers the Emancipation Proclamation during the second year of the American Civil War. January 1 The first claim under the Homestead Act is made for a farm in Nebraska January 8 Ground is broken in Sacramen.