Crescent Nebula

Image information:

Date: 06/22/2021
Equipment: Altair Hypercam 533C colour camera through APM/LZOS 105/650 APO telescope using Altair QuadBand OSC filter on Losmandy GM8 mount. The telescope was working at f6.2 with Astro-Tech 2" field flattener.
Image type: OSC
Exposure time: 80X3min, gain 250 (0.8e/ADU).

Object information:

Object designations:

NGC6888, Crescent Nebula
Object type:
Emission nebula
Object size:
20' X 10'
Constellation: Cygnus
Crescent Nebula was created by the brightest star in its center. Some 250 000 years ago the massive central star had evolved to become a Wolf-Rayet star (WR136). The star is shedding its outer envelope in a strong stellar wind. This wind has been impacting surrounding interstellar gas, compacting it into a series of complex shells. Strong radiation from the star has been ionizing the gas and lighting it up. WR136 will probably explode as supernova within next million years. The distance to NGC6888 is 4700 ly.

Related images:

List of related images:

Crescent Nebula, HaRGB, ST2000XM through WO ZS105ED telescope