Latest rendition is above - the old data reprocessed in August 2022
Abell 85 (CTB-1)
Below: a slightly wider view - which some may prefer.
Above image awarded AAPOD2 image of the day 28th August 2020
Abell 85 (also catalogued as CTB 1 or LBN576), is a large supernova remnant in the constellation Cassiopeia, which was originally catalogued by George Abell as a planetary nebula. Compared to the emission lines H-alpha, [SII] and [NII], Abell 85 emits relatively little in the [OIII] and H-beta lines, which is rather typical for supernova bubbles.
CTB is a supernova remnant (leftovers from an exploding star), similar to the famous Veil Nebula in Cygnus but much fainter. Its size in the sky is similar to the size of a full moon and it is approximately circular. Note, however, that its outer shell has ruptured between the 4 and 5 o'clock position. Originally this was thought to be a planetary nebula (which is why it appears as Abell 85 in his catalogue of planetaries) but in 1971 it was determined that it is actually a supernova remnant.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: FLI ML16200
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight , Astro Pixel Processor (for stacking), Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha, OIII, R, G & B
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 4426 x 3056
Dates: 27th Jul - 21st Aug '20
Frames:
Astrodon R 20 x 3'
Astrodon G 20 x 3'
Astrodon B 20 x 3'
Astrodon Ha 90 x 10'
Astrodon OIII 90 x 10'
Total Time: 33 Hours
Center (RA, Dec): (359.821, 62.538)
Center (RA, hms): 23h 59m 16.946s
Center (Dec, dms): +62° 32' 15.158"
Size: 2.06 x 1.38 deg
Radius: 1.240 deg
Pixel scale: 1.91 arcsec/pixel
Orientation: Up is N
CTB is a supernova remnant (leftovers from an exploding star), similar to the famous Veil Nebula in Cygnus but much fainter. Its size in the sky is similar to the size of a full moon and it is approximately circular. Note, however, that its outer shell has ruptured between the 4 and 5 o'clock position. Originally this was thought to be a planetary nebula (which is why it appears as Abell 85 in his catalogue of planetaries) but in 1971 it was determined that it is actually a supernova remnant.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: FLI ML16200
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: PHD 2, Pleiades Astrophoto PixInsight , Astro Pixel Processor (for stacking), Sequence Generator Pro SGP (for capture)
Filters: Astrodon Ha, OIII, R, G & B
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 4426 x 3056
Dates: 27th Jul - 21st Aug '20
Frames:
Astrodon R 20 x 3'
Astrodon G 20 x 3'
Astrodon B 20 x 3'
Astrodon Ha 90 x 10'
Astrodon OIII 90 x 10'
Total Time: 33 Hours
Center (RA, Dec): (359.821, 62.538)
Center (RA, hms): 23h 59m 16.946s
Center (Dec, dms): +62° 32' 15.158"
Size: 2.06 x 1.38 deg
Radius: 1.240 deg
Pixel scale: 1.91 arcsec/pixel
Orientation: Up is N
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