Hemisphere:  Northern  ·  Contains:  Crescent nebula  ·  NGC 6888
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NGC 6888 (Crescent Nebula) & Soap Bubble (PN G75.5+1.7), 


            Mike Oates
NGC 6888 (Crescent Nebula) & Soap Bubble (PN G75.5+1.7)
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NGC 6888 (Crescent Nebula) & Soap Bubble (PN G75.5+1.7)

Technical card

Imaging telescopes or lenses: Takahashi FSQ-106 ED

Imaging cameras: Starlight Xpress SX-814 Trius Monochrome CCD

Guiding cameras: Starlight-XPress Lodestar Autoguider

Software: Sequence Generator Pro  ·  Photoshop CS6  ·  PIXINSIGHT 1.8

Filters: Astrodon 3nm SII  ·  Astrodon 3nm OIII  ·  Ha 3nm  ·  Red  ·  Green  ·  Blue

Accessory: Lakeside Astro Motor Focus System  ·  Starlight Xpress SX 'Maxi wheel'  ·  Starlight Instruments FTF3545B-A Focuser

Dates:May 21, 2019

Astrodon 3nm OIII: 15x600" bin 2x2
Astrodon 3nm OIII: 8x120" bin 4x4
Astrodon 3nm OIII: 6x180" bin 4x4
Astrodon 3nm OIII: 1x300" bin 4x4
Astrodon 3nm SII: 14x600" bin 2x2
Astrodon 3nm SII: 8x120" bin 4x4
Astrodon 3nm SII: 1x300" bin 4x4
Astrodon 3nm SII: 6x360" bin 4x4
Blue: 4x60" bin 1x1
Blue: 17x30" bin 2x2
Green: 5x60" bin 1x1
Green: 18x30" bin 2x2
Ha 3nm: 15x600" bin 2x2
Ha 3nm: 8x120" bin 4x4
Ha 3nm: 7x300" bin 4x4
Red: 5x60" bin 1x1
Red: 18x30" bin 2x2

Integration: 10.5 hours

Avg. Moon age: 17.39 days

Avg. Moon phase: 92.40%

Bortle Dark-Sky Scale: 8.00

Mean SQM: 18.50

Basic astrometry details

Astrometry.net job: 2721298

RA center: 20h 13' 53"

DEC center: +38° 8' 52"

Pixel scale: 1.942 arcsec/pixel

Orientation: 359.747 degrees

Field radius: 0.880 degrees

Resolution: 2478x2122

Locations: The Hills Observatory, Manchester, United Kingdom

Data source: Backyard


Not a high resolution image as I chose to take this at bin 4x4 and 2x2 to speed up the image acquisition and I really wanted to get the Soap Bubble Nebula and with the shorter lighter nights approaching I did not want to let this one run till next year.

Narrowband images taken as bins 4x4 and 2x2 and stars taken at bin 2x2 and a few at 1x1. Narrowband data processed after star removal with Starnet++ and RGB stars added back.

Starnet++ removed all the stars and I did not need to do any manual touching up, a fantastic program.

Imaged over 6 nights May 11-21 2019



Mike Oates
License: None (All rights reserved)

Sky plot

Sky plot


NGC 6888 (Crescent Nebula) & Soap Bubble (PN G75.5+1.7), 


            Mike Oates

In these public groups

Broadband under Bortle 7/8/9