Shape shifting black object at sunset hovering south east in sky

At 5:15pm I looked out our 10th floor condo balcony and saw a one large black object  over South Mountain park.  The object remained south east in the sky for over 48 minutes from 5:15pm to 6:03pm.
The shape of the single object was like an upside down top hat or boiling pot.  During this time, it floated very gradually from left to right.  It also repeatedly grew smaller then back to its original size.  When smaller, it created a bird shape and then it would change back to the upside down top hat/boiling pot formation.
As it grew darker, the object lowered in the sky.  Once fully dark, it became lit with faint red and white lights. At 6:03pm it disappeared.
Compared to the airplanes landing at Sky Harbor Airport at the time, the object looked over 5 times bigger in size.