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: Ha 3nm
Accessory: Lakeside Astro Motor Focus System · Starlight Xpress SX 'Maxi wheel' · Starlight Instruments FTF3545B-A Focuser
Dates:Sept. 20, 2019
Frames:Ha 3nm: 42x1800"
Integration: 21.0 hours
Avg. Moon age: 20.56 days
Avg. Moon phase: 66.57%
Bortle Dark-Sky Scale: 8.00
Mean SQM: 18.32
Astrometry.net job: 2951562
RA center: 23h 59' 37"
DEC center: +62° 27' 46"
Pixel scale: 1.436 arcsec/pixel
Orientation: 0.041 degrees
Field radius: 0.858 degrees
Resolution: 3314x2748
Locations: The Hills Observatory, Manchester, United Kingdom
Data source: Backyard
A very faint supernova remnant in the constellation of Cassiopeia. CTB1 was originally thought to be a planetary nebula and was given the name Abell 85. It is about the same size in the sky as the Moon.
Long exposure subs in Ha with Astrodon 3nm filter. The aim of this image was to show in detail the structure of the remnant. It also shows just how much Ha there is in the area.
Imaged over 5 nights from 12 - 20th Sept 2019 under Bortle 8 skies with an average SQM-L of 18.32 (averaged nightly readings of 18.0 - 18.55)
After processing another image to the north of this one (Sh2-170 (The Little Rosette) Nebula), I found that I was able to show fainter nebula, obtain lower noise and better contrast, so I re-processed this again from scratch.
Description: Complete re-process.
Uploaded: ...
Comments