Helix Nebula with Halo H-a/OIII and RGB

Helix Nebula with Halo H-a/OIII and RGB

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Description

Astrodon 6 nm H-a, OIII and E-Series RGB filters.  OIII and H-a for the nebula and RGB for G2V balanced stars. Published in Sky and Telescope, 2004.

Image Date: 08/31/2003
Details: Exposure Time: 30 min OIII, 40 min H-a, 10 min each RGB
Camera: SBIG  ST-10XME
Telescope: Celestron  CPC 1100
Mount: Mountain Instruments  MI-250

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