Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  The star 9Cas
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Abell 85 / CTB-1, 


Abell 85 / CTB-1
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Abell 85 / CTB-1

Technical card

Imaging telescopes or lenses: Teleskopservice TS Photoline 130/910 mm APO Triplet

Imaging cameras: ZWO ASI1600mmpro

Guiding telescopes or lenses: TS 8 x 50 Finderscope

Focal reducers: Teleskop Service TSRED 379

Software: Adobe Photoshop CC2018

Filters: Baader Ha 36mm 7nm  ·  Baader O III 36mm 8nm  ·  Baader S II 8nm 36mm  ·  Baader R 36mm ungefasst  ·  Baader G 36mm ungefasst  ·  Baader B 36mm ungefasst

Accessory: Lacerta Mfoc Motorfocus  ·  Lacerta MGEN II

Baader B 36mm ungefasst: 30x30" (gain: 76.00)
Baader G 36mm ungefasst: 28x30" (gain: 76.00)
Baader Ha 36mm 7nm: 92x300" (gain: 139.00)
Baader O III 36mm 8nm: 100x300" (gain: 139.00)
Baader R 36mm ungefasst: 27x30" (gain: 76.00)
Baader S II 8nm 36mm: 100x300" (gain: 139.00)

Integration: 25.0 hours

Basic astrometry details

Astrometry.net job: 3026685

RA center: 23h 59' 20"

DEC center: +62° 25' 40"

Pixel scale: 1.070 arcsec/pixel

Orientation: 130.859 degrees

Field radius: 0.828 degrees

Resolution: 3333x4464

Locations: Balkon, Ascheberg, NRW, Germany

Data source: Backyard


Abell 85 is a supernova remnant in Cassiopeia. It is also a radio source (CTB-1). Abell 85 is a quite a dark object that emits light in the emission colors of hydrogen (Ha), sulfur (SII) and oxygen (OIII). The OIII emission is quite weak and the brighter structures are built up by SII and Ha. While SII is not as present in the background as Ha the brighter locations of the two emission colors are more or less identical. To show all three gas emission signals I gave SII the advantage over Ha in the bright structures and let Ha dominate the background. SII and Ha both shine in red colors. To have them separated in the image SII is represented in yellow color tones, Ha in red and OIII in blue tones. The stars are shown in their original colors.

Zwo ASI1600mmp and TS Photoline 130/910 mm with 0.7x reducer.

92 x 300s Ha with Baader 7nm Filter
100 x 300s SII with Baader 8nm Filter
100 x 300s OIII with Baader 8nm Filter
29 x 30s red
28 x 30 s green
30 x 30s blue

Astro PIxel Processor and PS CC 2019


Sky plot

Sky plot


Abell 85 / CTB-1, 



In these public groups

Cloudy Nights
Narrowband imaging