Helix Nebula Mini Notebook

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The Helix Nebula is a striking planetary nebula, one of the closest to us. It's located in the constellation of Aquarius at a distance of 215 parsecs (700 light-years). It's about 0.8 parsec (2.5 light-years) in diameter. The central star is a hot white, dwarf with. an effective temperature of 100,000 K, and is responsible for ionizing the surrounding gas causing the beautiful nebulosity. The images were taken by Kathryn Neugent and Phil Massey on October 8, 2013, and the color composite came from ten 100-sec exposures in B, ten 100-sec exposures in V, and ten 60-sec exposures in R. Minimal image credit: Massey / Neugent / Lowell Obs. / NSF. Details:4" x 6.5"Blank, non-lined pages Show more