Kepler sent some copies of his paper to Galileo Galilei, Tycho Brahe, Reimar Ursus and also to Limnaeus in Jena from the Frankfurt Book Fair in 1597. The above mentioned observatory is considered to be the first one in Jena.
Nothing is known about the instruments and the location of the observatory.
To all appearances the correspondence announced was not continued either. For the following centuries the professors Heinrich Hoffmann, Erhard Weigel, Georg Albrecht and Georg Erhard Hamberger are named in the literature running the observatory in Jena. Proceedings of the International Spring Meeting of the Astronomische Gesellschaft, Gotha, May 11-15, 1998.