It does look like a old crashed Fed Starship.
And its not like Kirk and co. being on their 5 years mission would preclude running into one of those, seeing as in TOS on their 5 years mission they ran into 3 intact or mostly intact ones, the last reported position of three of them, and a disaster beacon from one pretty far out from where they expected to find one.
The other pics show it to be pretty normal looking. The ones both with and without the shadow falling across it.
