![The Trifid Nebula (M 20) in H-alpha (green) [O III] (blue) and [S II] (red filters) using the WFC (Wide Field Camera) instrument at the 2.5m Isaac Newton Telescope (INT) in the Roque de los Muchachos Observatory (La Palma, Spain) in 2005.
This was one of the very first colour images using professional telescopes that I processed when I was doing my PhD at the Instituto de Astrofísica de Canarias (IAC, Spain). I used this image for illustrating my PhD Thesis and for explaining H II regions. The data were taken by Sergio Simón-Díaz as a part of a study of Galactic HII regions we were conducting at the moment.
This is a reprocessing of the data I've done in 2020, where I performed some cleaning of saturated stars, color correction, removing artefacts, hot pixels, and selective smart sharpen for revealing some extra details. However, I can't find the original FITS data of the individual channels, so this has been done over the Photoshop file I created in 2006, when I first created the colour image.
The data is actually a mosaic including the blue reflection nebula (at its top in this image), but I have not reprocessed (yet) the other ccd as it is very tricky (plenty of artefacts and a very saturated star). I hope to eventually do it.
Credit: Ángel R. López-Sánchez, Sergio Simón-Díaz, Jorge García-Rojas & César Esteban.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:cz5uoq2emhdgxcnndqq5our4/bafkreih5ndyhtgku7z3m7w4rwosmqn6u5jwybjyixjvyxvcwvhtrquj5em)
The Trifid Nebula (M 20) in H-alpha (green) [O III] (blue) and [S II] (red filters) using the WFC (Wide Field Camera) instrument at the 2.5m Isaac Newton Telescope (INT) in the Roque de los Muchachos Observatory (La Palma, Spain) in 2005. This was one of the very first colour images using professional telescopes that I processed when I was doing my PhD at the Instituto de Astrofísica de Canarias (IAC, Spain). I used this image for illustrating my PhD Thesis and for explaining H II regions. The data were taken by Sergio Simón-Díaz as a part of a study of Galactic HII regions we were conducting at the moment. This is a reprocessing of the data I've done in 2020, where I performed some cleaning of saturated stars, color correction, removing artefacts, hot pixels, and selective smart sharpen for revealing some extra details. However, I can't find the original FITS data of the individual channels, so this has been done over the Photoshop file I created in 2006, when I first created the colour image. The data is actually a mosaic including the blue reflection nebula (at its top in this image), but I have not reprocessed (yet) the other ccd as it is very tricky (plenty of artefacts and a very saturated star). I hope to eventually do it. Credit: Ángel R. López-Sánchez, Sergio Simón-Díaz, Jorge García-Rojas & César Esteban.
The Trifid Nebula with the INT - From Ángel López-Sánchez - https://flic.kr/p/2jWP5kf
