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Contains:  Bubble Nebula, NGC 7635
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The Bubble Nebula (NGC7635)

Technical card

Imaging telescopes or lenses:William Optics GT-81

Imaging cameras:ZWO ASI1600MM-Cool

Mounts:Orion Sirius EQ-G (HEQ5)

Guiding telescopes or lenses:Orion 50 mm Guide Scope

Guiding cameras:Orion Star Shoot Auto Guider

Focal reducers:William Optics Flat 6A

Software:Sequence Generator ProPHD2Cartes du CielEQMODPixInsight

Filters:Astrodon OIII 3nmAstrodon SII 3nmHa 5nm


Dates:Aug. 19, 2019Sept. 3, 2019

Ha 5nm: 155x300" (gain: 200.00) -10C bin 1x1
Astrodon OIII 3nm: 89x600" (gain: 200.00) -10C bin 1x1
Astrodon SII 3nm: 93x600" (gain: 200.00) -10C bin 1x1

Integration: 43.2 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 11.49 days

Avg. Moon phase: 54.41%

Bortle Dark-Sky Scale: 7.00

Basic astrometry details job: 3496266

RA center: 23h 20' 40"

DEC center: +61° 10' 55"

Pixel scale: 1.010 arcsec/pixel

Orientation: 273.352 degrees

Field radius: 0.178 degrees

Resolution: 900x900

Locations: Backyard, Flower Mound, Texas, United States

Data source: Backyard


Using my Bubble and Lobster Claw data from Sept 2019, I made a huge crop edit on the Bubble Nebula. This "bubble" is shaped by stellar winds radiated from the central star. In this false-color narrowband image the warmer tones are Hydrogen and Sulfur, while the blues are Oxygen.

OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster


Location: Flower Mound, TX (Bortle 7)
Dates: 8/19/19, 8/20/19, 9/3/19, 9/4/19, 9/5/19, 9/6/19, 9/7/19
Gain: 200 Offset: 50
Camera temp: -10C
Ha: 155x300" Astrodon 5nm
SII: 93x600" Astrodon 3nm
OIII: 89x600" Astrodon 3nm
Total integration time: 43hr 15min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)



Andrew Klinger
License: None (All rights reserved)

Sky plot

Sky plot


The Bubble Nebula (NGC7635), 


            Andrew Klinger

In these public groups

Narrowband imaging