hercules9999 Herculis is a multiple main-sequence star of spectral class F7 in the constellation of Hercules.. 99 Herculis visual magnitude is 5.04. Because of its faintness, 99 Herculis is visible to the naked eye only from locations with very99 Herculis is the Flamsteed desnation for a binary star system in the northern constellation of Hercules.It has the Bayer desnation b Herculis, while 99 Herculis is the Flamsteed