Blue Flash Nebula

Blue Flash Nebula (NGC 6905) in Delphinus

Technical Details Telescope: C11 Mount: MI-250 Camera: SBIG ST-10XME Filters: Astrodon LRGB Dates: August 11-17, 2007 Exposure: LRGB: L=11x5min, RGB=11R, 15G, 11Bx5min each for 4 hours total at -25C Notes: The Blue Flash Nebula is a small planetary nebula created when a star near the end of its life blows off a lot of gas into space.  Since this object is so small, I put a larger image of it in the upper left corner.  This object is about 4,700 light years distant.  It was discovered by William Hirschell in 1782.