V-shape white lights moving through the sky before disappearing

I was outside late at night with my dog and I saw a V-shape light formation moving fairly slowly through the sky. The V-shape was in a wide, roughly 90 degree angle and the lights were steady glowing white (they looked more like an LED light compared to a star). It was moving E to NE in the sky for about 20 seconds and then it disappeared before my eyes. While I noted that it was a triangle craft, I am only assuming because I was only able to see the lights, and the sky was too dark to tell if there was a craft connected to the lights.