| Date: 2011/07/07 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 | Ha (RGB) |
| Exhibition | (10 x 5 'bin 1 × 1), RGB (3 x 2' bin 2 × 2 each) |
| Pretreatment | nebulosity |
| Treatment | Photoshop and PixInsight |
Object description
| Object type | Emission nebula "The Veil Nebula" |
| Constellation | Swan |
| Visual magnitude | 5 |
| Distance | 1500 light years |
| Diameter | ? |
| Dimension seen from Earth | 60 x 8 arc minutes |
| NGC6992 is nicknamed the Veil or Lace Nebula. It is part of a vast cloud of gas and dust (called the Swan Veil Nebulae) listed by several nebulae, including the NGC6995 nebula which is the continuation of NGC6992 (not visible in the image and which is located towards the bottom in the photographed image). For this reason, several astrophotographers photograph together these 2 nebulae which they confusedly designate NGC6992 or NGC6995 instead of naming the two nebulae. The NGC6992 nebula is not visible in a small telescope because it is very dark. To see it in a telescope with a large diameter (8 '' and more), you need a sky very little polluted by city lights. Also since it is very dark, it is difficult to photograph. It takes a long exposure time per photo and the integration of several images. Here, the image of luminance has all its importance. In addition, it is necessary to master the techniques of preprocessing and processing astronomical images very well to bring out all the fine details. By comparing my image with those presented on the Web, I believe I did "well". NGC6992 represents the remains of several exploded supernovas. A supernova remnant is the final evolutionary state of a massive star (more than 6 times the mass of the Sun) that ends its existence with a huge explosion. After the explosion, only a rapidly expanding cloud of gas remains surrounding the star's residue. This gigantic gaseous cloud (of which we see only a part) is conducive to the formation of future planets. The stars which surround it go by gravity, appropriate these gases and dust. This dust will then orbit around these stars. Subsequently, this dust will assemble by gravity to form future planets. It is a superb anthill for the creation of planets. Perhaps, one of them will be conducive to the creation of life! |
| Richard Beauregard Sky Astro - CCD My impression "We cannot be alone in this gigantic universe" |