I have noticed a tendency recently for people to mention Neil deGrasse Tyson when talking about black people doing science, and doing astronomy in particular. There's absolutely nothing wrong with this; deGrasse Tyson is, in fact, black, and is, in fact, an astronomer. Indeed, as somebody who's caught the attention of the media and who evidently has the charisma to hold it, he's the closest thing we have to a modern-day Carl Sagan. So, go on celebrating him!
However, I am brought to mind this XKCD comic, in which Zombie Marie Curie comes back to take people to task for always mentioning her, and only her, when trying to convince people that women can do science.
There are actually lots of black astronomers out there, and I don't know who most of them are. (Just because I don't know who most of all astronomers are.) Yes, blacks do remain an underrepresented minority in astronomy, but that shouldn't take anything away from the individuals out there who are doing solid astronomy. I will mention two I have personally worked with. (There are more famous ones than these two, but my point is just to give a shout-out to a couple of good folks.)
Lou Strolger is an associate professor at Western Kentucky University. I met him in 1999 when I was a post-doc at LBNL and he was a graduate student at Michegan (although in residence in Chile) working with Chris Smith. In fact, Lou was a member of the other team; I was in Saul Perlmutter's supernova cosmology project, and Lou was in Brian Schmidt's team. However, in 1999, Saul's gang collaborated with Chris and Lou (and some others) on a search for "nearby" supernova. (Things less than a billion light-years away. You know, backyard stuff.) Lou went on to be a post-doc working with Adam Reiss (the third guy to share the Nobel Prize with Saul and Brian), and after that to WKU. Had I stayed at Vanderbilt, almost certainly I'd be collaborating with him now. My post-doc, Rachel Gibbons, and I talked to Lou about some collaborative ideas a year or so before I left Vanderbilt. Lou still works on supernovae and cosmology.
Jedidah Isler is a graduate student in astronomy at Yale— or, at least, she was last time I checked. It's possible she's graduated in the last year. I knew her when she was a master's student at Fisk University in the Fisk-Vanderbilt Bridge Program. Although I wasn't her advisor, I did interact with her, and worked with her on one project (that, sadly, didn't end up going anywhere, although she did come along to Chile with me and another graduate student on an observing run). Instead of continuing on at Vanderbilt, Jedidah had the opportunity to go work with Meg Urry at Yale; Meg Urry is one of the uberpundits of active galactic nuclei. (In an example of "small world" syndrome, one of Meg's post-docs, Erin Bonning, is going to be teaching physical science at Quest this coming year.) Last I talked to Jedidah, she was not sure she was going to continue in astronomy after graduating, but was considering going into public policy. We'll see what happens!