Its visibility  during morning twilight improved as it receded outward from the Sun; it peaked near zero magnitude, and at one point displayed a tail roughly 30 degrees in length, before falling below naked eye visibility by the end of December.
The object's visibility during dawn twilight improved as it moved away from the Sun; it reached its peak near zero magnitude, and at one point exhibited a tail roughly 30 degrees in length before fading below naked-eye visibility by the end of December.