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The dust cloud TGU H645 P2 and embedded in it young open cluster NGC 7129 areinvestigated using the results of medium-band photometry of 159 stars in theVilnius seven-colour system down to V = 18.8 mag. The photometric data wereused to classify about 50 percent of the measured stars in spectral andluminosity classes. The extinction A_V vs. distance diagram for the 20x20arcmin area is plotted for 155 stars with two-dimensional classification fromthe present and the previous catalogues. The extinction values found rangebetween 0.6 and 3.4 mag. However, some red giants, located in the direction ofthe dense parts of the cloud, exhibit the infrared extinction equivalent up toA_V = 13 mag. The distance to the cloud (and the cluster) is found to be 1.15kpc (the true distance modulus 10.30 mag). For determining the age of NGC 7129,a luminosity vs. temperature diagram for six cluster members of spectralclasses B3 to A1 was compared with the Pisa pre-main-sequence evolution tracksand the Palla birthlines. The cluster can be as old as about 3 Myr, but starforming continues till now as witnessed by the presence in the cloud of manyyounger pre-main-sequence objects identified with photometry from 2MASS,Spitzer and WISE infrared surveys.

The distance to the young cluster NGC 7129 and its age