CTB 1, also known as Abell 85 or the Garlic Nebula, is a supernova remnant about ten thousand light years away in Cassiopeia. What you are seeing is the expanding shell of gas left behind after a massive star exploded thousands of years ago. The blue structures trace oxygen rich filaments while the red reveals glowing hydrogen shaped by shock fronts racing through the surrounding interstellar medium. The asymmetric bubble and the long trailing filament suggest the original blast expanded into a lopsided environment where dense clouds slowed one side of the shock while the other burst freely into space.

Captured from Nerpio, Spain at the AstroCamp hosting facility, this field shows just how intricate a supernova remnant can be on large scales. The surrounding hydrogen landscape forms a deep red canvas where faint tendrils and rippling waves continue to drift outward. CTB 1 is relatively faint compared to iconic remnants, but its complex structure has made it a favorite for astrophotographers who want to reveal the fine turbulence left behind after a star’s final act.

This sweeping widefield frames two fascinating but very different nebulae: Sh2-170, nicknamed the Little Rosette, and Abell 85 (CTB 1), often called the Garlic Head Nebula. Sh2-170 is an emission nebula whose rosy glow is powered by hot, young stars ionizing the surrounding hydrogen gas. Its compact, circular shape resembles a miniature version of the famous Rosette Nebula.

To its side lies Abell 85, a much older supernova remnant spanning about 100 light-years. Its faint filaments trace the shockwaves from a massive star that exploded thousands of years ago, leaving behind this ghostly bubble of energized gas. Capturing both objects in a single frame highlights the dramatic contrast between stellar birth and death in our galaxy.

Image Description and Details : LBN 576 (also known as Abell 85 and CTB 1) is a faint supernova remnant lying almost 10,000 light years away.

Very diffuse nebula and challenge target, which required many hours of exposure, around 26 hours to obtain this result. Hope you like it.


Setup:
Mount: Sky-Watcher EQ6-r
Telescope: TS APO 80/500
Capture camera: QHY294MM
Guide camera: ASI 120MM
Filters: Baader CMOS Ha 3.5nm; Baader CMOS OIII 4nm
Frames:
Ha: 115x400s | Gain 1750 | -10ºC
OIII: 120x400s | Gain 1750 | -10ºC
Total Exposure: ~26h

Acquisition: Sharpcap; APT
Edition: PixInsight Core; PS
Location: Sabugo - Portugal | Bortle 6/7
Oct/Nov 2021

Copyright: Henrique Silva 

Image Description and Details :

Imaging telescopes or lenses: Explore Scientific 127mm ED TRIPLET APOImaging cameras: ZWO ASI1600MM Pro-CoolMounts: iOptron CEM60Guiding cameras: ZWO ASI290MM miniFocal reducers: Explore Scientific 0.7 Reducer/FlattenerSoftware: Adobe Photoshop CC · PixInsight 1.8.8 RipleyFilters: Chroma 3nm OIII · Chroma 3nm Ha · Astronomik LRGB 1.25"Accessory: ZWO EAF Electronic Auto Focuser · ZWO OAG · ZWO 8x 1.25" Filter Wheel (EFW)Dates:Oct. 14, 2020 , Oct. 15, 2020Frames:Chroma 3nm Ha: 32x600" (gain: 200.00) -10C bin 1x1Chroma 3nm OIII: 33x600" (gain: 200.00) -10C bin 1x1Astronomik LRGB 1.25": 90x30" (gain: 200.00) -10C bin 1x1Integration: 11.6 hoursDarks: ~43Flats: ~30Bias: ~100Avg. Moon age: 27.41 daysAvg. Moon phase: 5.33%Bortle Dark-Sky Scale: 4.00Temperature: 28.00Locations: UAE desert, Abu Dhabi, United Arab EmiratesData source: my own.



Copyright Information: Wissam Ayoub

Telescope Tecnosky 100Q F 5.8
CCD Moravian G3 16200
Ioptron CEM120EC
H-alfa 13X1800S Bin 1X1
OIII 10X1800S Bin 2X2
11 Dark 11 Flat 11 Bias
Processing Pixinsight
Gualdo Tadino (PG) Italy
SQM: 19.50/19.90

Copyright: Ciavaglia Francesco