The article is devoted to the analysis of hydrogen, helium and calcium emission in spectral lines of the quiescent prominence observed on the horizontal solar equipment HSFA-2 (Ond\u{r}ejov observatory, Astronomical Institute of the Czech Academy of Sciences). After crossing of theoretical and observed fluxes of spectral lines the prominence parameters are derived under the assumption of optically thin continuum and possible self absorbtion in lines. Comparison of 5 lines allow us to find out the parameters of the emitting gas with high validity. Three of four observational moments need to take into account the non-uniform structure of the gas.
96.60.th Visible emission
$^1$Physics Faculty of M.V. Lomonosov Moscow State University\
$^2$\
$^3$Astronomical Institute of the Czech Academy of Sciences
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