Mars Rover Photo Of UFO In Mars Horizon

Is this a UFO That’s been inadvertently picked up on camera by the Mars Rover ???

Could be a moon or planet maybe ?
What do you think ??
Look to the right of the photo above the horizon..

Left Navigation Camera Non-linearized Full frame EDR aquired on Sol 33 of Spirit’s mission to Gusev Crater at approximately 13:39:02 Mars local solar time. NASA/JPL

large photo located here