I remember a few details of the book I'm looking for. It is a space station in close orbit to the/a sun. Only children on board who are the children of the adults. But the adults were criminals and are now dead/gone. The adults, not sure if criminals or others maintained the station and with them dead/gone things start to fail. One thing in particular I remember is the one kid wearing weights everywhere even exercising and can't remember why he has to or at least couldn't think of a reason to take them off. I think the children thought themselves responsible for their parents crimes as well.
"Anvil of the sun" seems to be a stand out idea for the name of the book but have not managed to find anything yet. Thank you if you are able to help at all.