IC59 (the blue nebula) and IC63 (the red part) are good examples of a reflection nebula and an emission nebula.
The blue reflection nebula is illuminated by the light of Gamma Cassiopeia (the center star in the W shape of Cassiopeia).

The emission nebula consists of ionised hydrogen and therefore appears red in this image.
The reflection nebula lights up by the starlight of Gamma Cassiopeia. The starlight scatters off dust clouds which causes the blue reflection.

Both nebulae can be found in the center of the constellation Cassiopeia and lie at a distance of about 600 light years.

Other versions

Previous/older images:

Oct 17, 2009 – Canon 350D (80mm TMB-4h 12m)

Image data

Object info
Name IC59 & IC63
Type Emission/reflection nebula
Constellation Cassiopeia
Right ascension 00h 56m 34s
Declination +61° 03′ 29″
Distance 600 ly
Other designations
Image info
Image date Oct. 01, 2011
Light frames 24x 5 min. UHC-S unbinned
Total integration 2h
Dark frames 10x
Flat frames 10x p. filter unbinned, created with an A3 size Posterpoweruk flatfield panel
Bias frames 10x
Software used CCDOps, CCDSoft, ImagesPlus, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction).
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Atik 1HS Mono
Guide scope Vixen VMC110L
Autoguide software PHD Guiding
Filters Baader 2″ UHC-S
Location Landgraaf, The Netherlands
Image comments

DSLR color data of the 2009 image was used to colorize this (monochrome) version taken with the ST-8300M.