Fraternitas (minor planet designation: 309 Fraternitas) is a typical Main belt asteroid. It was discovered by Johann Palisa on 6 April 1891 in Vienna. Analysis of the asymmetric bimodal light curve of the asteroid from photometric data collected during 2014 provide a rotation period of with a brightness variation of in magnitude. References External links 000309 Discoveries by Johann Palisa Named minor planets 18910406