This is Sadalmelik. a bright star (V magnitude 3) in the constellation Aquarius. It is also known as Alpha Aquarii. The image was taken by Gaia recently. The star was observed when the satellite was spinning – the normal mode of observations. And I can tell you, that more stars are out there, many more. 😉 Unfortunately, I am not allowed to show.
Update: Earlier today I was thinking that maybe Astrium could provide some more info about this image as they are leading the commissioning of Gaia at the moment. Seems to be somebody is reading my thoughts! Here it is: http://www.astrium.eads.net/en/news2/gaia-on-its-way-to-the-stars.html. Merci!