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Thursday, May 16, 2013
I like to make starless versions of my astronomical images now and then. They'll show the actual nebula better and have a kind of mystique feel.
Human brains has a tendency to form some quasi logical shapes out of cloud of random dots, like stars in this case. Without stars, the shapes in a gas cloud stands out much better.
A starless Sharpless 142 (Sh2-142), the Wizard NebulaIn constellation Cepheus
Image with a suppressed stars, click for a large image.
Original image with a technical details can be seen in THIS blog post.
Image with the stars
NGC 7380 is a catalog number of the open star cluster inside Wizard nebula, SH2-142.
Nebula locates in constellation Cepheus, about 7000 light years from my home.
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations at 50% weight.
Levels, curves and color combine in PS CS3.
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 6,5Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 15x1200s, binned 1x1
S-II 1x1200s, binned 4x4
O-III 1x1200s, binned 4x4
Beside data here, a color information from an older wide field image is used.
Image can be seen here: http://astroanarchy.blogspot.fi/2011/02/sh2-142-wizard-nebula-wide-field.html