Palomar Globular Clusters
The Palomar Globular Clusters are a unique and challenging list of 15 very faint globular clusters. Most of these were only found after scrutinizing plates from the Palomar Observatory Sky Survey (POSS). I stumbled upon one of these clusters while looking around in Starry Night Pro and building a list of targets for my next observing session. It took several imaging sessions to capture my first Palomar Globular.
The web site http://www.deepsky-visuell.de/Projekte/PalomarGC_E.htm - offers a photographic view and sketch of each of the Palomar globulars as well as a table reference.
Palling Around With Palomar Globular Clusters, by Bob King, August 17, 2016 at Sky and Telescope Magazine (https://www.skyandtelescope.com/observing/palling-around-with-the-palomar-globular-clusters/) offers a nice article on the Palomar clusters, photographs and finder charts.
Astronomy-Mall also contains helpful observation information and a table of the Palomar Clusters at (http://www.astronomy-mall.com/Adventures.In.Deep.Space/palglob.htm).
Below is a Google Sheet of data I found from several sources.
The information above has been combined from several sources, thus the size of each object is given as a range. The items highlighted in blue have been imaged (thus far). Below shows my attempts to image these elusive globular clusters.