Catalogue and alternative designations

NGC 3918, blue planetary

Type Planetary Nebula
Position 11 50.3, -57 11
Constellation Centaurus
Camera and Telescope STL6303E and 31.75 cm Ritchey Chretien
Focal Ratio F9
Exposure Details This is a narrowband image with red assigned to Sulfur II (90m), green assigned to Nitrogen II (90m) and blue assigned to Oxygen III (110m).  Astrodon filters.  The image is a 300% crop.
Description This very bright planetary nebula (magnitude 8) is about 12" in diameter.  The distance is about 5000 light years.