Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)
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Heart of the Swan (IC 1318 C), 


            Gary Lopez
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Heart of the Swan (IC 1318 C)

Imaging telescopes or lenses: Sky-Watcher Esprit 100ED  ·  William Optics FLT 132 Triplet APO f/7

Imaging cameras: ZWO ASI1600MM Cooled PRO

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: Orion 50mm Guide Scope with helical focusing

Guiding cameras: Lacerta M-Gen II Autoguider

Focal reducers: William Optics Flattener 68III

Software: Adobe Lightroom CC  ·  Photoshop CC  ·  Main Sequence Software Sequence Generator Pro, v3.0  ·  Pleaides PixInsight Core 1.8

Filters: Astrodon OIII 3nm-31mm  ·  Astrodon SII 3nm-31mm  ·  Astrodon Ha 3nm-31mm

Dates:July 19, 2019Aug. 7, 2019Aug. 9, 2019Aug. 10, 2019Aug. 11, 2019May 24, 2020May 25, 2020June 17, 2020

Astrodon Ha 3nm-31mm: 195x180" (gain: 139.00) -15C bin 1x1
Astrodon Ha 3nm-31mm: 220x180" (gain: 200.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 114x180" (gain: 139.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 79x180" (gain: 139.00) -15C

Integration: 30.4 hours

Darks: ~50

Bias: ~50

Avg. Moon age: 10.61 days

Avg. Moon phase: 49.66%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 3628219

RA center: 20h 25' 56"

DEC center: +40° 26' 48"

Pixel scale: 0.862 arcsec/pixel

Orientation: -39.651 degrees

Field radius: 0.466 degrees

Resolution: 3107x2349

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard


Just south of Sadr, in the Gama Cygni Nebula, is IC 1318, the Butterfly Nebula. The body of the butterfly is a dark lane of dust, LDN 889, that bisects the colorful emission nebula that creates the butterfly wings. This image is the northern wing of the butterfly, IC 1318 C, a concentration glowing hydrogen, oxygen, and sulfur with of channel dark dust perforating the center of the mass.

This image combine data collected over two years with two different OTA’s (both with the same camera, ZWO ASI1600MM Pro). In 2019 I collect 19.6 hours of Ha, OIII, and SII using at SW Esprit 100 (FL 550mm), and in 2020 I collected 12.6 hours of Ha using a WO FLT 132 (FL 925mm). In this rendition I used the 2019 data for color mapping, and used both the 2019 and 2020 Ha data to create a master luminance. The FOV of the 925mm OTA was used for framing (1.2 degrees X 0.8 degrees).

Here is a link to the original 2019 Butterly Nebula image (IC 1318).