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         Abell 31 / Sh2-290
        Planetary Nebula in Cancer
      RA:08h 54m 44s  Dec: +08 49' 22" Size: 17arc/m Mag: 26

Click on image for larger size
Location & Date
Backyard, Abbott Observatory- Long Island, NY,  December, 2020
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader  Ha  SII OIII filters
CCD temp -15C
Exposures
Ha-9x10m  OIII-9x10m  SII-9x10m  Bin 1x1
Planning & Acquisition
Image planning - Sequence Generator Pro
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
Processing
CCDStack - calibration, debloom, align, normalize, combine, deconvolution
Adobe CS4 -  Color Image composition, Noise reduction, JPEG conversion
Mapped color Ha=green  SII=red  OIII=blue

  Abell 31, also known as SH2-290, was discovered by George Abell in 1955 and is a planetary nebula in the constellation Cancer with a distance of approximately 2000 light years. This is one of the larger planetary nebulas in the sky but has a very low surface brightness of Mag 26 due to its age and the fact that as it expands, it's also dispersing at high speed as evident by the large defined edge bowshock seen on the bottom.