When I click the "Indicate Photometric Objects" it circles most of the objects appearing in the image, but not all of them. Some of the objects also overlap the galaxy. When I click "Objects with Spectra" it only highlights ONE object. I'm not really sure what these two buttons are supposed to show me?
Welcome to the Zoo! As far as I understand, photometric objects are objects photographed and then given a basic analysis,
such as filter readings and type of galaxy, whereas objects with spectra, of which there are much fewer, give a more detailed
analysis as their spectra have been taken (obviously). Spectra are taken with a manual plate with holes, fitted to the telescope,
so as this is a laborious process, spectra cannot be taken for all objects.
Overlaps are when two photometric objects are close to each other and so the marked circles coincide with one another.