Night derelict's ??

Sorry if this sounds like a repeat thread but im not sure if anyone has mentioned the difference in the timeframe. Within some of the trailers there is an image of what we know as the derelict ( or juggernaut) clearly illuminated from beneath at night time, the background is dark anyway. However, the main derelict appears to start up and take off during the day, with Shaw seemingly standing on the opening docking bay. Could this be the proof that there is more than one ship, perhaps with differing purposes in the film ??