Abell 85 (CTB 1)
Image awarded APOD BRASIl on 7th Sept. 2024
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 7 and 8 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 telescope: Takahashi FSQ130ED
Imaging camera: ASI 2600MM
Mount: JTW Trident P75
Guiding telescope: Takahashi FS60CB
Guiding camera: QHY 5 II
Focal Extender / Reducer: None
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor, PixInsight.
Filters: Astrodon Ha (3nm), OIII (3nm) and Astrodon R,G,B.
Accessories: Robofocus Focuser controlled by Lunatico Armadillo, ATIK EFW 3, RB Focus Gaius, RB Focus Excalibur.
Dates: 14th - 17th Aug. 2024
Frames: (Total)
Astrodon Ha 60 x 600"
Astrodon OIII 60 x 600"
Astrodon RGB 3 x 60 x 60"
Total integration = 23 Hours
Center (RA, Dec): (359.827, 62.498)
Center (RA, hms): 23h 59m 18.365s
Center (Dec, dms): +62° 29' 53.214"
Size: 1.94 x 1.29 deg
Radius: 1.166 deg
Pixel scale: 1.19 arcsec/pixel
"Orientation", Up is 88.8 degrees E of 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 7 and 8 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 telescope: Takahashi FSQ130ED
Imaging camera: ASI 2600MM
Mount: JTW Trident P75
Guiding telescope: Takahashi FS60CB
Guiding camera: QHY 5 II
Focal Extender / Reducer: None
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor, PixInsight.
Filters: Astrodon Ha (3nm), OIII (3nm) and Astrodon R,G,B.
Accessories: Robofocus Focuser controlled by Lunatico Armadillo, ATIK EFW 3, RB Focus Gaius, RB Focus Excalibur.
Dates: 14th - 17th Aug. 2024
Frames: (Total)
Astrodon Ha 60 x 600"
Astrodon OIII 60 x 600"
Astrodon RGB 3 x 60 x 60"
Total integration = 23 Hours
Center (RA, Dec): (359.827, 62.498)
Center (RA, hms): 23h 59m 18.365s
Center (Dec, dms): +62° 29' 53.214"
Size: 1.94 x 1.29 deg
Radius: 1.166 deg
Pixel scale: 1.19 arcsec/pixel
"Orientation", Up is 88.8 degrees E of N
Sky Map & Finder Chart
Ha, OIII & RGB in the image:
Annotated Image:
