NGC 7023

Description

The Iris Nebula, cataloged as NGC 7023, blooms within the northern constellation Cepheus as one of the sky's most striking reflection nebulae. Unlike emission nebulae that glow from ionized gas, the Iris shines because fine grains of cosmic dust scatter and reflect the light of the hot young star HD 200775 at its center. The nebula's delicate blue hues arise through the same process that gives Earth's daytime sky its color, with shorter wavelengths of light scattered more efficiently by microscopic dust particles. Surrounding the bright core, intricate filaments of dark dust weave through the scene, revealing the complex structure of the interstellar medium from which stars are born.

Located roughly 1,300 light-years from Earth, the Iris Nebula offers a glimpse into the transitional relationship between stellar birth and the environments that nurture it. The central star's energetic radiation is gradually sculpting and dispersing the very cloud from which it formed, carving cavities and illuminating hidden textures within the dust. Deep exposures unveil faint brown and golden dust clouds extending far beyond the familiar blue petals, exposing a rich tapestry of cosmic material that bridges the gap between reflection nebula and dark molecular cloud. The result is a celestial portrait that combines scientific insight with extraordinary beauty, capturing a fleeting stage in the ongoing cycle of stellar evolution.

Setup :
▸ Askar FRA600 f/3.9
▸ ZWO ASI6200MC Pro @ −10°C
▸ Filtre Antlia Ultra RVB
▸ 151 × 300s + 150 × 60s (~15h au total)
▸ iOptron GEM45 / ZWO ASIAir Plus
Traitement : Siril · PixInsight · Photoshop

‍ ‍Name: Christian BERTINCOURT