So I’ve been thinking about this: what if I want target proposals for objects that have a nearby neighbor. Like the Double Cluster, or M81 and M82, or M35 and NGC 2158. So I came up with a generic filter in the photo planner that narrows the search results based on whether a particular result has a neighbor. The search switch is conjunction, and the unit is degrees, defaulting to 1 degree. Some searches (like an unpolite naked :conjunction) may still result in a server error (low memory), so the switch works on already specific queries.
Galaxies that have an obvious nearby friend:type:galaxy minlum:11 conjunction:1
Open clusters and/or globular clusters that are near each other:type:ogc :conjunction
Open or globular clusters or planetary nebulae with at least one planetary nebula in the pair. The curious cases of M46 and NGC 2818:type:pnogc conjunction:0.7 conjunctiontype:pn minsize:0.005
The results are some pretty nice vistas.