| Date: 2022/09/22 Observation place New Mexico |
Technical
| Telescope | Takahashi Epsilon 250 - 10 “, 850mm FL @ f / 3.4 |
| Mount | Paramount ME |
| Imaging camera | SBIG ST10XME - Non Anti Bloomin Gate (NABG) regulated at -10o Celsius |
| Image type | LHa (RHaVsB) (Vs for synghetic green) _______________________________ LHa: Luminance using the clear filter + the Ha filter RHa: Red layer using red filter + Ha filter This composition was used to bring out emission nebulae in the galaxy |
| Exhibition | Luminance (10 x 5 'bin 1 × 1), Ha (10 x 5' bin 1 × 1) R (10 x 1 'bin 2 × 2) and B (10 x 1' bin 2 × 2) |
| Pretreatment | Maxim DL |
| Treatment | Photoshop and PixInsight |
| Specific treatment | Create a synthetic green image |
Object description
| Object type | Spiral Galaxy “The Galaxy of Fireworks” |
| Constellation | Cepheus |
| Visual magnitude | 8,8 |
| Surface gloss | 14 |
| Distance | 22 million light years |
| Diameter | 40000 light years |
| Dimension seen from Earth | 11,4 ′ x 10,8 ′ of arc |
| NGC 6946, nicknamed the Fireworks Galaxy, is a spiral galaxy seen almost face-on. Straddling the constellations of Cygnus and Cepheus, it is located at a distance of about 22 million light-years. Its diameter is about 40000 light-years. It was discovered by William Herschel on September 9, 1798. This galaxy is the seat of “frequent” supernovae (explosion of a star at the end of its life), ten having been observed since 1917. NGC6946 also presents regions of star formation. In low light pollution skies, NGC6946 is easy to see, even in a small telescope. It then appears as a diffuse oval mist. My image of the firework galaxy was taken in a sky with no light pollution (in New Mexico). In an effort to bring out star-forming regions (places where there are emission nebulae), I incorporated a Hydrogen-Alpha filter into my image series, which helped bring out those regions. which appear in pink tones in the galaxy image. |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |