| Date 2015/01/17 Observation place French alps |
Technical
| Telescope | AstroSysteme Austria Orion 305mm – 12″, 1086mm FL, f/3,62 |
| Mount | ASA Direct drive Mount DDM85 |
| Imaging camera | MicroLine 8300 (Finger Lakes Instruments) – regulated at -30o Celsius |
| Image type | Ha (RVsB) (Vs for synghetic green) |
| Exhibition | Ha (11 x 3 'bin 2 × 2), R and B (4 x 2' bin 3 × 3 each) |
| Pretreatment | Maxim DL |
| Treatment | Photoshop and PixInsight |
| Specific treatment | Create a synthetic green image |
Object description
| Object type | Emission nebula "The Pacman Nebula" |
| Constellation | Cassiopeia |
| Visual magnitude | 7,4 |
| Distance | 10000 light years |
| Diameter | 80 light years |
| Dimension seen from Earth | 35 x 30 arc minutes |
| The NGC281 emission nebula is nicknamed "The Pacman Nebula" in reference to the 80s arcade game hero with that name. Indeed, with a little imagination, we can see his mouth swallowing everything at the bottom of the image! NGC281 is a pale nebula associated with the open cluster IC1590. It is about 10000 light-years distant from Earth and its diameter is 80 light-years. Its radiation is mainly made up of clouds of gas and dust in hydrogen. The nebula can only be seen with an amateur telescope in a sky with little light pollution. In this photo, the use of the hydrogen-Alpha filter as a luminance image made it possible to bring out all the beauty of this splendid nebula in this luminous spectrum. |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |