Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1805
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IC 1805 the center of the Heart Nebula in Cassiopeia, 



    
        

            Mark Wetzel
IC 1805 the center of the Heart Nebula in Cassiopeia
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IC 1805 the center of the Heart Nebula in Cassiopeia

Getting plate-solving status, please wait...
IC 1805 the center of the Heart Nebula in Cassiopeia, 



    
        

            Mark Wetzel
IC 1805 the center of the Heart Nebula in Cassiopeia
Powered byPixInsight

IC 1805 the center of the Heart Nebula in Cassiopeia

Technical card

Imaging telescopes or lenses: Celestron C9.25 Edge HD

Imaging cameras: ZWO ASI 1600MM-Pro Cool

Mounts: Celestron CGEMⅡ

Guiding telescopes or lenses: Celestron C9.25 Edge HD

Guiding cameras: ZWO 174MM Mini

Focal reducers: Celestron 0.7x Focal Reducer

Software: Celestron CPWI  ·  Main Sequence Software Seqence Generator Pro 3  ·  Pleiades Astrophoto PinInsight  ·  Adobe Photoshop CC 2021 Photoshop 2021  ·  PHD 2

Filters: ZWO 36mm 7nm SII  ·  ZWO 36mm 7nm OIII  ·  ZWO 36mm 7nm Ha

Accessory: Celestron OAG


Dates:Dec. 5, 2020Dec. 12, 2020Dec. 14, 2020

Frames:
ZWO 36mm 7nm Ha: 36x600" (6h) (gain: 139.00) -10C bin 1x1
ZWO 36mm 7nm OIII: 36x600" (6h) (gain: 139.00) -10C bin 1x1
ZWO 36mm 7nm SII: 35x600" (5h 50') (gain: 139.00) -10C bin 1x1

Integration: 17h 50'

Darks: ~25

Flats: ~50

Flat darks: ~50

Avg. Moon age: 25.33 days

Avg. Moon phase: 27.58%

Bortle Dark-Sky Scale: 4.67


Basic astrometry details

Astrometry.net job: 4145261

RA center: 2h 33' 32"

DEC center: +61° 22' 58"

Pixel scale: 0.886 arcsec/pixel

Orientation: 91.899 degrees

Field radius: 0.369 degrees


Resolution: 2400x1800

Locations: Mesa, Mesa, AZ, United States; Gold Canyon, Gold Canyon, AZ, United States

Data source: Traveller

Description

Mesa and Gold Canyon, Arizona
December 5-6 and 12-15, 2020

The immense emission nebula, IC 1805 is a favorite winter widefield target for astrophotographers. Since my telescope has a long focal length and narrow field of view, I imaged the center region of the Heart Nebula. The core area was captured with narrowband filters, Hydrogen-alpha (Ha), Oxygen-III (OIII) and Sulfur-II (SII). This was the first experiment where I took longer 10-minute exposures for each subframe. Luckily, few stars were clipped (blown out). This false color image uses the classic Hubble pallet, mapping SII to Red, Ha to Green and OIII to Blue channels.

IC 1805 is a large emission nebula in the constellation Cassiopeia. This nebula has strong signals in Ha, OIII and SII. NGC 281 is about 41.5 light years across, and it is about 10,000 light years from Earth (SkySafari Pro). There are striking dust lanes, with Pacman’s mouth being most prominent. There are also a few Bok Globules where new stars may be forming. There is an open star cluster in the center, IC 1590. The bright star in the center, HD 5005, is actually member of a stable quintuple system. This image shows a nice combination of bright, delicate emission regions and dark areas. The background is full of gas and dust showing some of the extent of the material in the center of the heart.

I used the ColorMask script and the CurvesTransformation tool in PixInsight to change the color balance and saturation in different regions of the nebula. I was able to highlight the bright golden regions and balance that with the cyan-blue areas. I am slowly learning how to apply different sharpening tools to the luminance image that was extracted from the SHO color image, and balance that with changing colors and saturation in the RGB image without over doing it. Once the Luminance is combined with the RGB image (LRGB), then further refinement was done using the ColorMask script and the CurvesTransformation tool. The image was then cropped and fine-tuned in Photoshop.

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