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The ultraviolet and far--ultraviolet spectra of HD 147888 allows to accessthe v=0 as well as higher vibrational levels of the ground H2 electronic level.We have determined column densities of the H2 molecule on vibrational levelsv=0-5 and rotational levels J=0-6.  The ortho to para H2 ratio for the excited vibrational states equals to 1.2.For the lowest vibrational state v=0 and rotational level J=1 the ortho to paraH2 ratio is only 0.16. The temperature of ortho-para thermodynamicalequilibrium is T_OP=43+-3 K.  The large number of H2 absorption lines in the HST spectra allows todetermine column densities even from a noisy spectra.  The measurements of H2 column densities on excited vibrational levels (fromthe HST spectra) leads to constrains of radiation field in photon-dominatedregions (PDR) models of interstellar cloud towards HD 147888.

Interstellar H2 toward HD 147888