Hahn discovered the central star of the Ring Nebula, M57 in about 1795, when observing the nebula with his 12" reflector of Herschel type (Hahn 1800).

He died on October 9, 1805 in Remplin, Mecklenburg, Germany at age 63.

Friedrich von Hahn was honored by the naming of Moon Crater Hahn, at the NE limb of the Moon's disk.

Links

• Friedrich von Hahn images and informaions, NGC/IC oberservers page

• Friedrich von Hahn, 800. Einige Beobachtungen über Mira Ceti; über die Nebelflecke in der Leyer und der Hydra, ingleichen eine neue Entdeckung des Hrn. D. Herschel, den Wärmestoff betreffend, angestellt und mitgetheilt von Hrn. Erb-Landmarschall und Ritter von Hahn zu Remplin [Some Observations of Mira Ceti, on the Nebulae in Lyra and Hydra, as well as a new Discovery of Dr. Herschel, concerning the Matter of Heat, made and communicated by Erb-Landmarschall v. Hahn at Remplin]. Astronomisches Jahrbuch für das Jahr 1803, pp. 106-107 [Bibcode: 1800AJBer1803..106H]. Discovery and first observation and description of the central star of Planetary Nebula M57, the Ring Nebula.

• Dietmar Fürst and Jürgen Hamel. Graf Friedrich von Hahn auf Remplin. Journal für Astronomie, No. 3 (II/1999), pp. 79-81.