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Heart Nebula in Hydrogen-Alpha

This image is 1 hour of Hydrogen-α (Ha) 5nm data of the IC 1805 deep sky object, the famous Heart Nebula.

Tech Card

Date / Location

24th December 2018, Bedworth, GMT+0, United Kingdom, Bortle Class 5 ~SGM: 19.57 mag./arc sec2


Camera: ZWO ASI 1600MM-PRO USB 3.0 Mono (Type CMOS)

Sensor Cooling Temperature: -15C

Filter: 1.25" 5nm Astrodon Ha

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 composities and sensitivity

30 x 120" subs (Gain 200, Offset 50/16, Binning 2x2)

Total Integration Time


Calibration Frames

30 Darks, 30 Flats


PixInsight 1.8 Core