Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  The star 9Cas
The Garlic Nebula / CTB1 / Abell 85 / LBN576 in HOO+RGB, 


            Maroun Habib
The Garlic Nebula / CTB1 / Abell 85 / LBN576 in HOO+RGB
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The Garlic Nebula / CTB1 / Abell 85 / LBN576 in HOO+RGB

Technical card

Imaging telescopes or lenses: TMB Optical TMB 92SS

Imaging cameras: ZWO ASI 1600MM Pro

Mounts: iOptron CEM70

Guiding telescopes or lenses: Orion 60mm Guide scope

Guiding cameras: ZWO ASI 290MM Mini ZWO 290MM Mini

Software: PixInsight PinInsight 1.8.5  ·  Sequence Generator Pro  ·  SharCap Pro

Filters: Baader O3 1.25'' 8.5nm  ·  Baader Ha 1.25" 7nm

Accessory: ZWO EAF

Dates:Sept. 15, 2020Sept. 22, 2020

Baader Ha 1.25" 7nm: 252x600" (gain: 139.00) -15C
Baader O3 1.25'' 8.5nm: 480x300" (gain: 139.00) -15C

Integration: 82.0 hours

Darks: ~60

Flats: ~60

Flat darks: ~60

Bias: ~60

Avg. Moon age: 16.51 days

Avg. Moon phase: 19.08%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details

Astrometry.net job: 3965431

RA center: 0h 0' 0"

DEC center: +62° 52' 40"

Pixel scale: 1.526 arcsec/pixel

Orientation: 171.393 degrees

Field radius: 1.194 degrees

Resolution: 3520x4400

Locations: Lebanon, Lebanon, Lebanon

Data source: Backyard


A supernova remnant about a full moon of apparent size in the constellation of Cassiopeia. It is a very faint object as it was challenging in terms of planning, acquisition and processing.

I originally started imaging this target earlier in July, but after my camera died on me, I restarted this target 2 months later with a different chip size, thus a re-framing was in need. After checking several sky surveys for this matter, I landed on a vertical field of view, where the nebula was conceived to appear rising above a hill of dark nebulosity. Later to notice that this hill was actually an undocumented nebula, and a candidate for a new supernova remnant (see the filaments and ribbons at the bottom of the frame).

I went berserk mode on this target after noticing the nebulosity at the bottom, I planned for 100 hours but ended up with only 82, including 10 minutes length of exposures. I dropped 30% of those frames, but this helped me solve multiple issues with my setup including 3 sources of differential flexure (hint for future plans: OAG).
Will I go full berserk mode after a target again? Probably yes, but not anytime soon for a faint one.

Probably the most challenging target I have processed, it involved using Gaussian Blur in some parts for noise reduction that I am not proud of, but I learned different new techniques during this process.

Under the hood:
iOptron CEM70, TMB92SS, ZWO ASI1600mm pro, 290mm mini, 60mm Orion guidescope
Hii: 252x600s (42 hours)
Oiii: 480x300s (40 hours)
Software: SGP, Phd2, Sharpcap, Pixinsight, Adobe Photoshop and Lightroom CS5
Credits: Daniel Caracache for lending me his mono camera and filterwheel set
Location: The MVST Observatory (Moophz' Very Small Telescope)


Sky plot

Sky plot


The Garlic Nebula / CTB1 / Abell 85 / LBN576 in HOO+RGB, 


            Maroun Habib