About this Image
The main object in the center of this image represents a dying star
throwing off outer shells of ionisized gas. The center part is very
bright and extends just over 25 arc seconds. The huge very faint filamentary
shell (made visible by strong stretching) is 10.000 times fainter.
It reports of ancient previous eruptions of the star that have dissipated
far out into space. It is named Cat's Eye Nebula due to its symmetrical
and colorful shape. It shows one of the most complex structures of
all planetary nebulae known. Astronomers suspect the bright central
object may actually be a binary star system.
supplement to the nebula the ringed Seyfert 2 galaxy NGC 6552 in approx.
360 millions light years distance is shining to the right. North is
16" cassegrain in secondary focus at f/10
|Camera||SBIG STL-11000M at -15C, internal filter wheel, AO-L|
|Filters||Astronomik H-alpha, LRGB|
|Date||June 09-16, 2007.|
|Sky Conditions||mag 5 sky, raw FWHM 1.1 - 1.4", temperature 20;|
close-up: Ha:L:R:G:B = 10:10:5:5:5 minutes (30 sec subexposures)
full size: L:R:G:B = 300:120:80:120 (20 min subexposures), all 1x1.
|Processing||Image aquisition in Maxim DL 4.56; preprocessing and deconvolution in CCDstack; wavelets filtering; other in Photoshop;|