White object moved slowly through sky with no smoke or noise.

I was laying on a rock beach at the Willamette River looking at the sky and noticed a white object lit up by the setting sun. It moved slowly in a SSE direction over the river. It had no wings. It was about as high up as a drone would be but made no noise. There was no smoke trailing behind it. It moved steadily across the sky, slowly making its way to the SSE in a straight line. The white lit up part looked linear like "cigar" shaped, but after zooming in on the pic it appears to be rounded and somewhat disc shaped.