Newbie here. I am trying to make sense of the target Datasheet - specifically the sub-class of the target. Is there a legend for what the letters and numbers mean?
For example - NGC7380 has a data sheet showing a sub class of III3pn. What does this mean?
As a newbie I am trying to work out what images with RGB and what needs more specialised filters - HA, OIII etc. I was hoping the sub-class may give me a hint. Didn’t want to spend time imaging something that needs a set of filters I don’t own…
Many sub-classes do have that kind of information, but I’m afraid I can’t explain all those references very well.
Most of that information came from databases which had those explanations somewhere else (like appendixes).
At any rate, I’m planning a big target database update soon which will hopefully shed some light into this kind of doubts. As well as a feature to let users tag objects as good targets for certain filters, and share their experience
That is a Trumpler classification for open star clusters. There is a different one for galaxies, planetary nebulae, and globular clusters. Each from a different astronomer. Galaxies from Hubble, later revised by De Vaucouleurs. Planetary Nebulae VV (Vorontsov-Velyaminov). Globular Clusters by Shapley & Sawyer Hogg.
