| Date 2015/11/09 Observation place My permanent observatory in Longueuil in white light pollution zone |
Technical
| Telescope | Orion 80ED refractor - Diameter 80 mm (3,15 ''), focal length 480 mm, f / 6 |
| Mount | Celestron CGEM |
| Imaging camera | Atik 383 L + monochrome regulated at -20o Celsius |
| Autoguiding camera | ZWO ASI 120MM with one optical splitter |
| Auto Guidance Accuracy (RMS) | 1,68 '' of arc (3,36 '' of arc in total) |
| Image type | Hubble Palette: Ha (SII-Ha-OIII) |
| Exhibition | SII (10 x 10 'bin 2 × 2), Ha (10 x 10' bin 2 × 2) and OIII (10 x 10 'Bin 2 × 2) |
| Image acquisition software | Maxim DL |
| Guidance software | PHD Guiding 2 |
| Pretreatment | Maxim DL |
| Treatment | Photoshop and PixInsight |
| Specific treatment | Hubble Palette |
Object description
| Object type | Emission nebula and open cluster "La Rosette" |
| Constellation | Unicorn |
| Visual magnitude | 5,5 |
| Distance | 5500 light years |
| Dimension seen from Earth | 80 x 60 arc minutes |
| The Rosetta Nebula looks like a sparkling carnation. In the center, the star cluster NGC 2244 is easy to identify with binoculars. These stars formed about 4 million years ago. The glow of the nebula comes from the ionization of the gas it contains by ultraviolet radiation from this group of very hot massive stars. These stars are also responsible for the "rosette" appearance of the nebula. In addition, they emit a stellar wind which clears the center of the nebula, which also allows the creation of new stars by compressing the cloud of gas and dust. To combat the light pollution of my observation site (which is in the white zone) and to bring out even more the very beautiful contrasts and nuances of the nebula, I used narrow band filters with the association called the Hubble palette (SII-Ha-OIII). This combination of color filters served to bring out in the image the chemical distribution of the main elements of the nebula by offering a wide variety of colors. We can also observe that the whole gives a 3D effect to the image! |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |