I watched the unusual phenomena in the night sky.

I watched the unusual phenomena in the night sky.
It was about four months ago.
In the sky, two bright stars, they were next to each other. Why I paid attention to them? They were a bit brighter than the polar, so they caught my attention. Before, I did not notice the stars.
What is most interesting. I watched them for a minute, his eyes. Then they slowly died out. The sky was clear, no clouds.
The same phenomenon was observed by my colleague. This he told me recently. He also saw those same two stars.
I want to be objective. I thought about those objects, there are two or three that are flying towards the Earth.
But lately I've noticed several times in the sky these objects. Only in these cases, it was one, too, a bright star. Attenuated, they have different time, usually within 10 minutes.

Can anyone have any information or suggestions about this, but a UFO?