Sh2-290 aka Abell 31

Sh2-290 aka Abell 31 - Planetary Nebula in Cancer

Sh2-290 aka Abell 31 is a planetary nebula in the constellation of Cancer

From Wikipedia: Abell 31 (also known as Sh2-290 or PK 219+31.1) is an ancient planetary nebula in the constellation of Cancer. It is estimated to be about 2,000 light years away.
The central white dwarf has a spectral type of DAO. Abell 31 is mainly composed of hydrogen and oxygen gas. The blue oxygen occupies the central region and makes up the bulk of the nebula,
while the red hydrogen makes a ring at the nebula's edge. This object is very old, and consequently, it is very large and dim (specifically, it has a low surface brightness), and its gas is dispersing into the interstellar medium.

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Imaging Details:
Telescope: Astro-Physics AP155EDF w 4" FF
Camera: Moravian G4 (16803 chip) w 7-position filter wheel and Astrodon Gen II LRGB Filters
Mount: Paramount MX from Software Bisque

HaRGB:
H-Alpha is 9 x 20 min
RGB are 12/10/9 x 10 min per channel
Acquisition in TSX via CCD-Commander
Bulk of processing PixInsight and some final clean-up in Photoshop

Lucknow, Ontario, Canada
March 2026

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