Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  NGC 7635
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NGC 7635 - Bubble Nebula - HOO narrowband, 



    
        

            rhedden
NGC 7635 - Bubble Nebula - HOO narrowband
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NGC 7635 - Bubble Nebula - HOO narrowband

Technical card

Imaging telescopes or lenses: Edge HD 1100

Imaging cameras: QSI 660 WS

Mounts: Software Bisque Paramount MX

Guiding telescopes or lenses: Edge HD 1100

Focal reducers: Celestron f/7 reducer for Edge 1100 HD

Software: GIMP  ·  Deep Sky Stacker  ·  Fitswork 4  ·  IrfanView  ·  Regim

Filters: Orion Extra Narrowband Filter OIII 1.25"  ·  Orion Extra Narrowband Filter Ha 1.25"

Accessory: Innovations Foresight On-axis guider  ·  Starlight Xpress Lodestar X2


Dates:Sept. 11, 2017Sept. 16, 2018

Frames:
Orion Extra Narrowband Filter Ha 1.25": 21x540" -14C bin 1x1
Orion Extra Narrowband Filter Ha 1.25": 8x540" -18C bin 1x1
Orion Extra Narrowband Filter OIII 1.25": 18x540" -18C bin 1x1

Integration: 7.1 hours

Avg. Moon age: 13.59 days

Avg. Moon phase: 57.59%

Bortle Dark-Sky Scale: 4.00


Basic astrometry details

Astrometry.net job: 2307751

RA center: 23h 20' 45"

DEC center: +61° 12' 28"

Pixel scale: 0.464 arcsec/pixel

Orientation: 172.084 degrees

Field radius: 0.225 degrees


Resolution: 2724x2180

Locations: Back Yard, Lubbock, TX, United States; Washington County, North of Salem, New York, United States

Data source: Traveller

Description

This image of NGC 7635 was started in my light-polluted back yard in Lubbock TX and finished on a dark hilltop in upstate NY a year later. H-alpha data were taken from both sites. The H-alpha subs from the dark site had noticeably better contrast. The O-III subs were shot from the dark hilltop. This image is a tremendous improvement over my old Bubble Nebula image shot with the same telescope in LRGB. Part of the improvement is due to the narrowband filters, which provide tiny stars and better contrast, and part of the improvement is due to having a more sensitive camera now.

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