UFO Sighting in Pindamonhangaba, State of São Paulo on 2017-06-23 20:50:00 - Bright object disc - boomerang shaped object

1. astroimaging with telescope 2. seeing the sky 3. im used to see airplanes, and meteors,but its a very unusual object, none of common objects ever saw 4. straight line, but not fast, like a arriving plane. 5. its a very unusual sighting as i said, i felt fear and excitement at the same time. it simply vanished when it reaches low altitude (aprox. 50 meters altitude)