Not sure of the current status for the professional astronomer market, but here are some tips from someone who has explored many professional occupations.
Be wary of average income figures, especially in a professional occupation where salary ranges vary widely. Look into what a beginning astronomer makes to get a true picture of what to expect.
Also, you need to check on any profession from a supply and demand point of view, especially one that calls for a graduate degree as a minimum. You are going to have to invest heavily in education to become an astronomer, especially in a field where doctorates are common. What are the job prospects at the end of the road?
Lastly, be sure you are good with technology. Most professional astronomy is about crunching numbers and data on a computer and operating sophisitcated electronic equipment. Very few professional astronomers actually sit under a telescope
and look through the eyepiece, these days.
Best of luck to you. I can't imagine a finer goal for a career. Astronomy is science at its exploratory best.