 The observations from ESO's telescopes are stored in a huge archive, a vast and complex vault of online information, usually only visited by professional astronomers on a mission. And yet, an amateur astronomer from Russia managed to uncover a veritable gem in the flood of data, thereby winning a trip to Chile to observe with a very large telescope. How did he manage it? And could you do the same? This is the ESOcast, cutting-edge science and life behind the scenes of ESO, the European Southern Observatory, exploring the ultimate frontier with our host Dr. J, aka Dr. Joe Liske. Hello and welcome to the ESOcast. In this episode, we're going to take a deep plunge into the vast archives of ESO. And we're going to show you how a group of very dedicated and talented amateur astronomers managed to unearth some hidden treasures. As the world's most productive, ground-based astronomical observatory, ESO has many terabytes of data coming from its La Silla and Paranal observatories that need to be safely stored. In addition to using these data for scientific research, ESO often delves into its archive to find raw data that can be polished into breathtaking astronomical images that can be shared with the public. However, turning the raw data into the images that you see is an intricate process that requires technical processing skills, as well as an artistic eye. The archive is publicly available so anyone can go and search your potential images. But aside from professional astronomers and ESO's public outreach team, not many other people have ventured into the vast archive. So how can we encourage people just like you to go and delve into the archive and to test your skills at producing beautiful astronomical images with professional data? We knew, of course, that there are lots of talented amateur astronomers out there, but we had to find a way to get them excited about ESO's data. And so we came up with the idea of a competition, ESO's Hidden Treasures. The challenge was tough. Find a dataset in the archive with the potential for making a visually stunning image and then process the data. As a reward for the hard work, however, we put up a great first prize. The chance to not only visit ESO's very large telescope in Chile, but to actually use it to observe the night sky. Nevertheless, despite the great prizes, we were a little worried that not enough people would be up for the challenge and that many participants would give up halfway. We were in for a big surprise. The competition opened on 4th October 2010. Participants were asked to upload their entries to an ESO flicker group that was created specifically for the competition. The competition was promoted via ESO's Twitter feed using the hashtag ESOtreasures and Facebook page by ESO Community Coordinator Oana Sandu. Tweets about the competition from people around the world were picked up by science journalists, creating valuable coverage of the competition in the media. To our surprise, entries quickly started coming in. By the end of the competition, we had almost 100 entries, which was a fantastic response. Once the competition had closed, the judging panel, which included science communication professionals and image processing specialists, met to evaluate many images. Several of the entrants submitted more than one image that deserved an award, so the judges made the decision to choose 10 best entrants rather than the 10 best images. This led to a total of 20 winning images. Russian amateur astrophotographer Igor Chekalin, aka flicker user Igor F.P., caught the attention of the jury. Working from his home in the countryside and with limited access to the internet, Igor's skills and artistic eye won him first place in the competition for his wonderful image of Messier 78. The data of Messier 78 that Igor has found are really superb, both in terms of quality and in terms of depth. He has processed the raw images with great skill and he assembled them very well to produce this final image. Igor has also applied some smart post-processing filters to enhance the details of the nebula. The colors are wonderfully subtle, they show the light diffused by the nebula and the dark dust that partially obscures it. In my opinion, this is one of the very best images ever obtained with the 2.2 meter telescope on La Silla. The competition proved that there are lots of talented amateur astronomers out there who are capable of producing really astonishing results with ESA's observations, just like the pros. And finally, well done Igor. I'm sure you're gonna have a great time at Paranal. It's a lot of fun to observe with the VLT. This is Dr. Jay, signing off for the ESOcast. Join me again next time for another Cosmic Adventure.