Two bright lights flying in formation, the lead one dim followed by a bright white light

While skygazing for the 'green comet' I witnessed two lights, seemingly connected though it was too dark to see if they actually were. There was no noise from the object, the lead light was a very dim white, followed by an extremely bright white light trailing a fair distance behind the lead light. The light approached from the north and slowly curved and turned east, it was moving slowly, almost like a blimp, and seemed to be fairly large if it was a single object. No aircraft were visible on the ADSB Exchange or Flightradar24 at the time, and local traffic control streams from like ATC didn't mention any objects (This object would have been in the controlled airspace for Pittsburgh International.) To determine I wasn't crazy I made two relatives come outside to view the object, they confirmed they could also see it. After about five minutes or so the lead light faded, turning a dim red before vanishing, the trailing light doing the same several seconds after. Neither light was near the horizon or any object that would have obscured them. Planes are normal here (especially large military tankers) but they're always loud, this object was completely silent. I took a photo with my phone but the phone camera is poor quality, but I'll attach it anyway. Depicted is only the rear brighter light, the smaller light isn't visible in the photo.