AEHF5 by United Launch Alliance
This is the United Launch Alliance AEHF-5 satellite launch.
With a launch time of 6:13am (ET) and a sunrise of 6:48am, the downrange plume caught the rising sunlight perfectly. There's even a hint of crepuscular rays emanating from the horizon.
This is a 251-second exposure captured from Palm Shores, Florida, looking across the Indian River Lagoon. The shadowy figure on the dock is a fisherman, net fishing, but he sure paused to watch the launch. Afterward, he asked me if the rocket exploded, and I assured him it did exactly what it was supposed to do.