| Date 2015/10/08 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 | Atik 383 L + monochrome regulated at -20o Celsius |
| Autoguiding camera | ZWO ASI 120MM with one optical splitter |
| Auto Guidance Accuracy (RMS) | 1,63 '' of arc (3,26 '' of arc in total) |
| Image type | Ha (Ha-OIII-OIII) |
| Exhibition | Ha (11 x 10 'bin 2 × 2), OIII (11 x 10' Bin 2 × 2) |
| Image acquisition software | Maxim DL |
| Guidance software | PHD Guiding 2 |
| Pretreatment | Maxim DL |
| Treatment | Photoshop and PixInsight |
Object description
| Object type | Emission nebula and open cluster |
| Constellation | Check |
| Visual magnitude | 6,5 |
| Distance | 12000 light years |
| Diameter | 100 light years |
| Dimension seen from Earth | 40 x 30 arc minutes |
| IC 410 is an emission nebula located 12000 light-years from Earth. It contains in its heart the open cluster NGC 1893. It is a dark nebula composed of a cloud of hydrogen. Here, the use of a Hydrogen Alpha filter as the luminance image is quite appropriate to bring out all the nuances and contrasts of this superb nebula. The cloud is lit by stellar winds and radiation emitted from the open star cluster NGC1893 that was formed in the interstellar cloud just 4 million years ago (compared to the age of the universe which is 13,73 billion years old)! The exposure time of nearly 3,67 hours in a 2 × 2 bin (equivalent to 14,68 hours in a 1 × 1 bin) of this wide-field image allowed for the dark dust surrounding the nebula to be well detailed. We also see appearing to the right of the center of the nebula and slightly upwards two cosmic "tadpoles" measuring 10 light years long. They are made up of cooler, denser gas and dust. Their particular shape is sculpted by the winds and the radiations of the stars of the cluster. As seen in the image, their trail points away from the central region of the cluster. This region is conducive to the formation of new stars. |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |