ngc6888_HOS_fullmosaic_8bit

NGC6888 (The Crescent Nebula) and it's surrounding nebulosity in Cygnus.

 

This is a 4-panel mosaic image taken with narrowband filters mapped with RGB to H-alpha, Oxygen-iii and Sulfur-ii respectively.

 

Each panel consists of between 6 and 12 exposures of 5 mins each, with O-iii and S-ii binned 2x2.

 

Due to inconsistent numbers of frames in the panels, there's some colour artefacts visible around joints and some bright stars.

 

Camera: QHY23 mono

Scope: Takahashi E130

Focal length: 430mm f/3.3 per frame

 

Taken over 2 nights on 9/10 May 2017 from Cumbria, UK.

Done