Emperor's Ship...since everyone seems to have missed it.

It can be seen a few ways, V for victory or almost as a middle finger salute to the Defiant's Starfleet's Logo.

 

I'm going to throw this out here: What if it's not a ship at all? What if it's a space station/starbase?

In the preview clip from After Trek, Burnham and Lorca are in a shuttle traveling at warp. The Emperor came in a ship to the rebel planet so why would they be warping to see her? I'm guessing that the palace that we see in the pictures and ship that Georgiou took the photon the crap out of the rebels are two different things.

 

That's no moon....