Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1795  ·  IC 1805  ·  IC1795  ·  IC1805  ·  NGC 896  ·  NGC896  ·  Sh2-190
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Heart Nebula (IC 1805, Sh2-190) and WeBo 1 (PN G135.6+01.0), 


            Gary Lopez
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Heart Nebula (IC 1805, Sh2-190) and WeBo 1 (PN G135.6+01.0)

Imaging telescopes or lenses: William Optics GT71 71mm f/5.9 Apo Refractor

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 0.8X Field Flattener

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:Oct. 28, 2019Oct. 29, 2019Oct. 30, 2019

Astrodon Ha 3nm-31mm: 396x180" (gain: 139.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 80x180" (gain: 139.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 80x180" (gain: 139.00) -15C bin 1x1

Integration: 27.8 hours

Darks: ~30

Bias: ~50

Avg. Moon age: 1.48 days

Avg. Moon phase: 3.33%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 3030325

RA center: 2h 33' 6"

DEC center: +61° 25' 9"

Pixel scale: 2.305 arcsec/pixel

Orientation: -114.247 degrees

Field radius: 1.695 degrees

Resolution: 4227x3196

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

Data source: Backyard


Beating in the body of the mythical queen of Aethiopia, Cassiopeia, is the Heart Nebula. Nearly 200 light-years across and 7,500 light-years from Earth, this bright emission nebula spans about 2 degrees of the night sky, an area about four times the diameter of the full Moon. The young, massive star cluster at the center of the Heart energize the surrounding gases dominated by hydrogen, with lesser measures of oxygen and sulfur.

As a bonus in this project, the planetary nebula, WeBo 1, is also present beneath the Heart in the bottom right of the frame. It is a peculiar object with a young barium star surrounded by a ring-like planetary nebula.

The weather has been exceptionally clear and dry here in northern California for the last few weeks, giving me lots of opportunity to capture the data for this project. To visualize the intricate structures of this nebula I acquired about 30 hours of data, emphasizing the very strong hydrogen signal (nearly 20 hours). In this rendition I have used a standard HST palette which, for my taste, reveals the beauty of this spectacular nebula.