According to the Law Office of Alan Korn it is not possible to 'copyright' a band name, but there are other ways to protect it from being 'stolen' by another band. That said, this seems to apply more to two real bands having the same name rather than your situation.
The article How to Use Real People in Your Writing Without Ending Up in Court by Helen Sedwick (a business lawyer with 30 years of experience) seems to be more relevant. Even though a band name is not a person's name, this simple rule would seem apt:
If what you write about a person is positive or even neutral, then you
don’t have defamation or privacy issues.
In other words, don't say stuff that might annoy the band.
Personally, if I were in Enceladus and someone wrote a book or story with the name of my band in it then I'd probably be chuffed (British word for 'very pleased'). Seems like a win-win for all concerned. I mean - they would tell friends and family about the story, giving some attention and, in the other direction - your story might bring some attention to the band.
And actually, Enceladus have a Facebook page - why not drop them a line on it? They look like a decent bunch of lads - this could be the start of a n interesting friendship - who knows!
Good luck with your writing going forward.