Mercury had a favorable eastern elongation in the Spring of 2016, as seen from the northern hemisphere and I was able for the first time to use my approach of taking star -field photographs to track it.  The graph shows the three points closest to maximum and from them I could locate the maximum to have occurred on 4/18/2016 at about 8:30 in the morning, Universal time.


May 9th 2016.  Finally!  I got to see a transit of Mercury, or at least half of it, for the first time.  Mercury is the lower dot.