Thank you to all of you that played the game!
Here are the good answers with the explanations, at least for the "UFOs" that were found.
1- Austin, TX - USA, 2011
It was very likely a towed advertisment. The full analysis can be read here
The same kind of towed advertising banner was seen and photographed over New York the same year (2011) and I was lucky enough to find the exact
banner, using the same methodology as the report above. See here
for the full 21 pages
to intrptr and AboveBoard, while I'm not sure if AB meant a towed banner as well.
2- France, 2012
Nobody found the answer.
3- France, 2010
to 3n19m470 !
It was indeed a streetlamp bulb photographed, with the camera moving down during the very last part of the 2s exposure, causing the dotted streak. The
flash fired, then impress the whole landscape scene on the CCD, but the OP did not wait for the 2s. exposure to end and took its camera down,
producing this dotted streak, typical of a 50Hz streetlamp frequency.
4- Portugal, 2010
5- France, 2012
... were indeed light fixture reflections; both pictures were taken through glass. Congratulations to AB again for finding the explanation.
N°4 was taken, inside one of the multiple rooms of the Portuguese Sintra National
, through a window, and were there are some light fixtures on the ceiling:
N°5 was taken inside the Chenonceaux Castle in France:
6- France, 2009
Here, almost everyone agrees that this is a parachute, (a smaller one, see below) but there's a 'plus'.
Indeed, at the time this photo was taken, I didn't knew that it was also faked. It was the only time I met a case were the hoaxer dare to fake the
photo metadata to hide manipulations (in fact he said in a latter communication that it was PSed to hide the parachute strings).
7- Romania, 2013
Here again, most of you were right about this one to be an airplane with landing lights on and with shaking camera during the 1.6s exposure time
causing the swirls.
The red light is a beacon light (there are normally 2 of them, one under the fuselage, which we see here, the other one over the fuselage). This red
light reflects, on both sides, on the turbine engines, thus the 3 visible red spots on the picture.
According to regulations, these beacon lights are supposed to deliver between 40 and 100 flashes per minute, which well explains that we only see
them once during the 1.6 seconds exposure time.
And what about n°2??