| Date 2013/11/04 Observation place My permanent observatory in Longueuil in white light pollution zone |
Technical
| Telescope | Orion 80ED refractor - Diameter 80mm, focal length 480mm, f / 6 |
| Mount | Celestron CGEM |
| Imaging camera | NightScape color regulated to -10o Celsius |
| Image type | Image with a color camera and IDAS LPS v4 (Narrow Band for Nebula) filter. Create a synthetic luminance image using the red channel. The image therefore becomes: HAs (Ha-OIII-H_Beta) HAs: Synthetic luminance in Ha using the red layer. |
| Exhibition | A 20 x 10 'bin 2 × 2 color exhibit Note: the NightScape camera allows the 2 × 2 bin in color |
| Image acquisition software | Maxim DL |
| Guidance software | PHD Guiding 2 |
| Pretreatment | Maxim DL |
| Treatment | Photoshop and PixInsight |
| Specific treatment | Creating a synthetic luminance image |
Object description
| Object type | Emission nebula containing "The Horse's Head Nebula" |
| Constellation | Orion |
| Visual magnitude | 5 |
| Distance | 1600 light years |
| Dimension seen from Earth | 60 x 14,3 arc minutes |
| Nebula IC434 is a large, low-brightness nebula that contains Horse Head Nebula B33 (from the Bernard catalog). Although its overall visual magnitude is 5, it is mostly due to the very bright stars that compose it. The very beautiful red colored gas clouds are much darker and thus difficult to perceive in a telescope. These gases and dust appear clearly in long exposure photos. Here, the use of an IDAS-LPS v4 nebula filter and the selection of the Red color layer as the luminance image made it possible to isolate the radiation from the nebula in the Hydrogen-Alpha. This made it possible to bring out the beautiful nuances of the nebula in this light spectrum while eliminating the light caused by light pollution. For this photo, we must take into account the strong magnitude of the star Alnitak (1,79), which risks being strongly overexposed and thus hamper the results. In the photo, this star is on the left of the image. I managed not to overexpose it by judiciously using Photoshop's curves. |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |