J-PLUS filter system. The solid magenta line represents the uJAVA filter; the blue adjacent curves (dotted and solid) represent the J0378 and J0395 filters, respectively; the following cyan curves (dotted and solid) represent the J0410 and J0430 filters; the three solid red lines are the narrow-band filters J0515, J0660, and J0861. These eight filters were designed specifically for J-PLUS. The remaining dashed black lines are the broad-band SDSS filters: from left to right, lines: g, r, i, z. For comparison, the spectral templates of four taxonomical classes (source: http://smass.mit.edu/busdemeoclass.html) are included: C (solid, blue), X (dotted, red), S (dashed, orange), and V (dash-dotted, green). The spectra have been shifted for better graphical representation, and normalized to 0.515 microns, which, of the central wavelengths of every filter, is the nearest value to 0.55 microns, the most commonly used value for normalization of reflectance spectra of asteroids in the visible wavelength range. We note that the spectral templates do not cover the ultraviolet (UV) region (below 0.45 microns).