Jump to content






Recommended Posts

Hello all. There is a small open cluster close to the perseus double that my software labels TR2. My limited understanding is that the trumpler system is a means of classification (ie properties) rather than a 'list' such as Messier or NGC? Is Tr2 a recognised label such as with NGC, or just a description? Thanks.

Link to comment
Share on other sites

It's both - there's a Trumpler classification of clusters, and also a list of Trumpler clusters, with Tr2 being one of them. The second link below summarises his system, the third link is to Trumpler's original paper from 1930. Trumpler examined photographs (the Franklin-Adams plates) and found 334 clusters, most of which had already been catalogued in NGC, IC or by Melotte; but he also found 37 not previously catalogued, which he listed as "anonymous". These are the ones now named after him. Table 16 of the paper gives his classification list: the cluster which he called "An. 2" (now called Trumpler 2) has classification II3p.

Robert Julius Trumpler - Wikipedia, the free encyclopedia



Edited by acey
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.