Standing in my backyard around 2130 hrs i noticed a bright flash to the sw. thought it was merely a star in my peripheral vision. keeping my eyes on the general vicinity of the flash i noted one 5 seconds later but was surprised that it appeared to be in a slightly different location than first flash. over the course of the next 5 minutes or so i witnessed flashes approx every 3-5 seconds with obvious significant location changes (up/down/left/right). some flashes looked like a strobe where others were much more gradual glow before winking out. i got my binoculars and studied the mystery for 3-4 minutes to ensure the object was indeed changing position in the sky. i was also able to ascertain no navigation lights on the object. after 5 minutes it slowly blinked its was south into mexico. as an aside, i am an air force veteran with 34 years of experience, and have always been on the flying side of the business. i know aircraft and i know what constitutes "something very unusual". this was unusual.