<human>: Summarize the given text in a few sentences.

This is really sensitive work, so I am being as vague as possible.

I am a full time researcher at a major research university. Recently, the professor I work for obtained a new, never before seen data set. This data set is very groundbreaking and I have no doubt our analysis will make national news.

I, and I alone, was assigned to work with this data set from the very start of the project. As a researcher, I produce all the statistical analysis. That means I do all the coding and produce  the analytical output. This really is the bulk of all the work. Every figure, table, and description was produced from my code.  I went into this project believing co-authorship on the paper was implied. After all, I probably put in about 600 hours to the professor's 200. 

Recently, over the phone, my professor made it sound like I wouldn't be getting co-authorship on this paper. He said we could do a more in depth analysis of the current data for the next project, and publish that together. It definitely sounded like that would be the consolation for not getting my name on this current paper, which should be submitted soon. 

I'm really bummed because I've grown very attached to this project and my work. I put in tons and tons of overtime even though I don't get paid for it, mainly because I expected to be a co-author, so I didn't mind. 

I really want to approach my professor but I don't know how. He could easily shut me down and there's nothing I can do about it. Authorship is a very sensitive area in academia. I also need a very good rec from him for grad school, so I don't want to put any strain on our relationship. What is the best way to go about approaching this?
<bot>: I expected to be a coauthor on a paper I put in the majority of work for, but now it seems like I won't get that