Abell 31 (= PK 219+31.1 or Sh2-290) is an ancient planetary nebula in the constellation Cancer. The apparent size according to Cartes du Ciel is 1008 x 936 arc-secs, thereby it would even outdo the Helix nebula (NGC 7293). The surface brightness is extremely low, it is specified as 27 mag/arc-sec².
This is a section of the image, resampled to 50 %.
The whole image can be found here: https://www.dropbox.com/s/32d7y3ybmv2gf5i/Abell31_neu.jpg
Takahashi FSQ 106
ZWO ASI2600MC Pro
STC Duo Narrowband Filter
Tijarafe, 10., 13. and 14. April 2021
94 x 5 min = 7 h 50 min
This is my second image with the Duo Narrowband Filter. After my experience with Sh2-157, I did not capture frames without filter this time. I would have liked to capture longer total exposure time, particularly for Ha. Unfortunately I aimed for this object too late in the year, and now it is not reasonable to try it again.
Bernd
This is a section of the image, resampled to 50 %.
The whole image can be found here: https://www.dropbox.com/s/32d7y3ybmv2gf5i/Abell31_neu.jpg
Takahashi FSQ 106
ZWO ASI2600MC Pro
STC Duo Narrowband Filter
Tijarafe, 10., 13. and 14. April 2021
94 x 5 min = 7 h 50 min
This is my second image with the Duo Narrowband Filter. After my experience with Sh2-157, I did not capture frames without filter this time. I would have liked to capture longer total exposure time, particularly for Ha. Unfortunately I aimed for this object too late in the year, and now it is not reasonable to try it again.
Bernd
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