Because calling any of the "first people" or "indigenous" people who are not Eskimos, Eskimos, is pretty rude if you're not one.
Calling every one of that diverse group of people "Eskimo" is not only lazy and incorrect, it's pretty dismissive. There are a bunch of tribes and different groups, Eskimos are mostly the folks living right at the very top of the polar regions.
Imagine if every black person you met you called an Aborigine? Wrong continent, wrong region, wrong description.
It’s not being used to describe a large diverse group of people, it’s being used to describe an astronomical body. You just said that eskimo is a valid description for some of the people way up north. So why is it automatically a smear to name something after that particular group? Just because it’s not a generic name for all of them? If I named a quasar the aborigine quasar would that also be a smear against all other black people?
You need a hobby. Thought about stamp collecting? Hummel figurines?