The Crescent Nebula and Interstellar Gas Clouds
The Crescent Nebula (NGC 6888) is a cosmic bubble nebula 5,000 light years away blown by winds from its central dead star. An integration of Hydrogen-α and Oxygen III data that I collected during the short and bright nights of June this year (2019). 186 minutes (62 x 3 mins) total integration time. The final image was processed with PixInsight's StarMask and MLT to reduce the stars for a dramatic view of the cosmic nebula in a sea of cosmic gas clouds.
Tech Card
Date / Location
29th June 2019, 30th June 2019 & 2nd July 2019, Bedworth, GMT+0, United Kingdom, Bortle Class 5 ~SGM: 19.57 mag./arc sec2
Equipment
Camera: ZWO ASI 1600MM-PRO USB 3.0 Mono (Type CMOS)
Sensor Cooling Temperature: -15C
Filters: 1.25" 5nm Astrodon Ha, 1.25" 3nm Astrodon OIII
Imaging Telescope: Takahashi FS-60CB
Correcting Lens: Takahashi Reducer 0.72x (composite focal length at 264mm and focal ratio at f/4.9)
Mount: iOptron CEM25EC
Image Quality
12Bit ADC (FITS)
Exposure time per image / number of composites and sensitivity
62 x 120" Ha subs (Gain 200, Offset 50/16, Binning 2x2)
44 x 120" OIII subs (Gain 200, Offset 50, Binning 2x2)
Total Integration Time
3hrs 32mins
Calibration Frames
25 Darks, 20/20 Flats for Ha/OIII
Software
PixInsight 1.8 Core
Photoshop
SharpCap
DEEP SKY
STARSCAPE
SOLAR SYSTEM
EVENTS
