Wednesday, February 24, 2010
IC 443 finalized
A cosmic A-Bomb
I named this image of IC 443 to a "Cosmic A-Bomb" since it looks like a gigant explosion. In fact, it is a remnant of a gigant nuclear explosion, Supernova.
Nebula in natural color. Narrowband channels are mixed to match visible spectrum. Red=80% H-alpha+20% S-II, Green=O-III and Blue=80% O-III+20% H-alpha to compensate otherwise missing H-beta.
Nebula in HST-palette, Red=S-II, Green=H-a and Blue=O-III
Generally this was on of the moust difficult object to shot in longer focal lenght. Surface brightness is very low and there is extremely faint nebulosity around a main object. I wanted to show it and a detailed filaments of the supernova remnant main body. The actual remnant is much large, than my limited field of view can show.
An older wide field image of the IC 443 from a Spring season 2009.
Exposures:
-H-alpha 8x1200s binned 1x1
-S-II 4x600s binned 2x2
-O-III 5x600s binned 2x2
Optics: Tokina 300mm TX f2.8 @ f2.8
Camera: QHY9 @ -50 C
Guiding: Lx200 GPS 12" + LQHY5 and PHD-Guiding
I think, this was as hard object as a Sh2-240 (Simeis 147), Supernova remnant in Taurus. I shot it in last Spring season; http://astroanarchy.blogspot.com/2009/01/sh2-240-more-lights.html
I found out, that color, in my older wide field image, is very usable for this new closeup version! There is not much details in very dim O-III and S-II channels- I use a method of mine, Tone Mapping, to make a color composition from images with a very different scale. It works just fine!
H-alpha channel after a Eleven hours of exposures.
Technical details:
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO @ 7Hz
Image Scale, 0,75 arcseconds/pixel
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Exposures:
H-alpha 18x1200s, binned 1x1 + 14 x 1200s, binned 2x2, Flats. Bias and Darks
Total exposuretime for H-alpha is about eleven hours.
Note, colors in this image are shot with a different optical configuration, back in Spring 2009, details are in a text above.
Tuesday, February 23, 2010
IC 443, a prewiev version in HST-palette
IC 443, HST-palette
I have shot this target with much wider field last year;
http://astroanarchy.blogspot.com/2009/02/ic443-in-hst-palette.html I took colors from this image and use them with my new H-alpha channel to build a kind of prewiev version of narrowband color image.
When weather allows, I'll shoot better color channels with a native focal lenght.
IC 443, as a Stereo Pair
Parallel Vision
Cross Vision
NOTE! This is a personal vision about forms and shapes, based on some known facts and artistic impression. Viewing instructions can be found from a Right hand side menu.
Original Image with details can be found HERE
Much more stereo images can be found HERE
An anaglyph Red/Cyan version.
You'll need Red/Cyan Eyeglasses to be able to see images right. Note, if you have a Red and Green filters, you can use them! Red goes to Left eye.
Monday, February 22, 2010
Planetary Nebula, PK 164+31.1, more lights
Nebula in natural color. Narrowband channels are mixed to match visible spectrum. Red=80% H-alpha+20% S-II, Green=O-III and Blue=80% O-III+20% H-alpha to compensate otherwise missing H-beta.
At the same time as I was imaging IC 443 in prevoius post, I shot more lights for this dim planetary in Constellation Lynx, since IC 433 was too low after midnight.
Due the low brightness this objet is not commonly imaged, even though it has a largish angular diameter to a planetary nebula. (6'.67" x 6'.67")
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3. -
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO @ 9Hz
Image Scale, 1,5 arcseconds/pixel
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Exposures
H-alpha 32x1200s, binned 2x2 and 7x1200s, binned 3x3 = 13h
O-III 2x600s, binned 4x4 and 1x1200s, binned 4x4
S-II 3x600s, binned 4x4 and 1x1200s, binned 4x4
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