You may have already received possible answers to the object following the ISS you witnessed last night. I heard your report on Coast to Coast AM, although I listen to the show online the following morning. On SpaceWeather.com for today (09 August, 2013) is an article about a Japanese robotic spacecraft HTV-4 that is in pursuit of the ISS.((NUFORC Note: Witness indicates that the date of the sighting is approximate. PD))