Cocoon Nebula, Exmoor, 2020

Interstellar dust clouds and the cosmic cocoon, located 3,300 light years away where a newly developed cluster of stars live inside it. As photographed under the pristine dark skies of Exmoor, Brayford a clear night of September 2020.

Tech Card

Date / Location

17th September 2020, Brayford, North Devon near Exmoor, GMT+0, United Kingdom, TEMP: 16C, Bortle Class 3 ~SGM: 21.73 mag./arc sec2


Camera: Nikon D810A

Imaging Telescope: Takahashi FSQ-85ED

Correcting Lens: Takahashi Reducer-QE 0.73x (composite focal length at 328mm and focal ratio at f/3.8)

Mount: iOptron CEM25EC

Image Quality

14 bit RAW (NEF)

Exposure time per image / number of composities and sensitivity

ISO 3200, 24 x 180" subs

Total Integration Time

1hr 12mins

Calibration Frames

25 Darks, 50 Bias, 25 Flats


PixInsight 1.8.5 Core