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Catalogue and alternative designations

NGC 7293, Helix nebula

Type Planetary Nebula
Position 22 29.6, -20 48
Constellation Aquarius
Camera and Telescope STL6303E and 31.75 cm Ritchey Chretien
Focal Ratio F9
Exposure Details Hydrogen Alpha was 640 minutes unbinned with 3nm Astrodon Ha filter.  Colour version is HaLRGB 640:180:290:200:200 all unbinned with Astrodon series 2 filters
Description Located in Aquarius, the Helix is one of the nearest planetaries being about 700 light years distant.  Because of its large size (15' x 12') it has a fairly low surface brightness although the visible magnitude is 6.5.  The prominent central star is magnitude 13.4.  It was discovered by Karl Ludwig in one of his sky surveys prior to 1824.