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Aims: This paper has two main objectives: (1) To determine the intrinsicproperties of 16 faint and mostly unstudied open clusters in the poorly knownsector of the Galaxy at 270$^\circ-$300$^\circ$, to probe the Milky Waystructure in future investigations. (2) To address previously reportedsystematics in Gaia DR2 parallaxes by comparing the cluster distances derivedfrom photometry with those derived from parallaxes. Methods: Deep UBVIphotometry of 16 open clusters was carried out. Observations were reduced andanalyzed in an automaticway using the ASteCA package to get individualdistances, reddening, masses, ages and metallicities. Photometric distanceswere compared to those obtained from a Bayesian analysis of Gaia DR2parallaxes. Results: Ten out of the 16 clusters are true or highly probableopen clusters. Two of them are quite young and follow the trace of the CarinaArm and the already detected warp. The rest of the clusters are placed in theinterarm zone between the Perseus and Carina Arms as expected for olderobjects. We found that the cluster van den Berg-Hagen 85 is 7.5$\times$10$^9$yrs old becoming then one of the oldest open cluster detected in our Galaxy sofar. The relationship of these ten clusters with the Galaxy structure in thesolar neighborhood is discussed. The comparison of distances from photometryand parallaxes data, in turn, reveals a variable level of disagreement.Conclusions: Various zero point corrections for Gaia DR2 parallax data recentlyreported were considered for a comparison between photometric and parallaxbased distances. The results tend to improve with some of these corrections.Photometric distance analysis suggest an average correction of $\sim$+0.026 mas(to be added to the parallaxes). The correction may have a more intricatedistance dependency, but addressing that level of detail will require a largercluster sample.

Sixteen overlooked open clusters in the fourth Galactic quadrant. A combined analysis of UBVI photometry and Gaia DR2 with ASteCA