| Date: 2016/09/28 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) | 1,05 '' of arc (2,10 '' of arc in total) |
| Image type | Hubble Palette: Ha (SII-Ha-OIII) |
| Exhibition | SII (8 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 "The fetus nebula" |
| Constellation | Cassiopeia |
| Visual magnitude | 6,5 |
| Distance | 6500 light years |
| Diameter | 100 light years |
| Dimension seen from Earth | 60 x 30 arc minutes |
| Dimension visible in the photographs | 150 x 75 arc minutes |
| IC 1848 is an emission nebula and an open cluster in the constellation Cassiopeia. It is called the Fetal Nebula for its great resemblance to a fetus. Look at the picture and we can easily see, at the top of the picture, his head followed by his body in the fetal position! It is home to several open star clusters. Before photographing the nebula, plan to take a larger field of view to include nebulosities not visible visually (mainly in alpha hydrogen). The visual dimension (telescope) being 60 'x 30' of arc, while the dimension that can be photographed is approximately 150 'x 75' of arc. I was able to verify this fact, before taking the photo, by looking at the image in the SkySafari software with my personal configuration. In a sky without light pollution, you can easily see star clusters as well as a small portion of the nebula using small telescopes and binoculars. Using an OIII filter will allow a better view of the nebula. For my image, which I took in a sky of significant light pollution (Longueuil in the suburbs of Montreal), I used narrow band filters with the Hubble palette association (SII-Ha-OIII). This allowed me to get all the signal of this nebula in its emission lines and bring out all the beautiful contrasts and nuances of it in addition to displaying a wide variety of colors. |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |