Sunday, January 26, 2020
Deep in to my heart, IC 1805 in mapped colors
HST-palette separates emission areas nicely and it's visually pleasing. In visual palette emission from sulfur and hydrogen are both at red part of the spectrum. Emission from oxygen is greenish blue.
I made some testing with my new imaging system based on Tokina AT-x 300mm f2.8 camera lens.
The CCD I'm using has kind of large pixels, 9 microns, so I'm undersampled, the image scale is just over 6 arcseconds / pixel. Undersampling is not a bad thing when my targets are large and dim nebula complexes. This system collects photons very fast!
The CCD I'm using has kind of large pixels, 9 microns, so I'm undersampled, the image scale is just over 6 arcseconds / pixel. Undersampling is not a bad thing when my targets are large and dim nebula complexes. This system collects photons very fast!
I selected the Heart Nebula as a target since I have plenty of reference material for it. Another reason is interesting and rarely imaged area after the bright tip of the heart. There are some remnants of a supernova explosion. I was really thrilled, when I saw the final stack of 12 600s H-alpha light frames. (Equal to 2h of exposures) I never have seen so much background nebulae and details from this popular target.
The Heart Nebula, IC 1805
Please, click for a large image
C 1805 in mapped colors, from the emission of ionized elements,
R=Sulfur, G=Hydrogen and B=Oxygen. (Hubble Palette)
SUPERNOVA REMNANT 132.7+1.3 (HB3)
IC 1805 in visual palette
Please, click for a large image
SNR
In this photo there is a large supernova remnant, marked as a white circle. I haven't seen any photos of it before. I must take more O-III exposures to see, if I'm able to pick up any signal from this supernova remnant.
Radio image of the area shows mostly signal from OB6
IC 1805 H-alpha emission alone
Please, click for a large image
Technical details
Processing workflow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Tokina AT-x 300mm f2.8 camera lens
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 12 x 600 s, binned 1x1 = 2 h
O-III, 3x 600 s, binned 1x1 = 30 min..
S-II, 2x1200 s, binned 2x2 = 40 min.
O-III, 3x 600 s, binned 1x1 = 30 min..
S-II, 2x1200 s, binned 2x2 = 40 min.
Saturday, January 25, 2020
A deep view to the California Nebula in mapped colors
beautifully rounded stars.
The very same optics with a camera, that has a very small pixels, will give a resolution of around one arcsecond / pixel. With same optical configuration, 300mm f2.8, system that has spatial resolution of 1 arcsecond / pixel is 36 times slover, than same optics with large pixels and spatial resolution of 6 arcseconds / pixel.
California Nebula, a deep view to the NGC 1499
Please, click for a full size image
Image is in mapped colors, H-alpha = Green, S-II = red and O-III = Blue.
This is a very deep image, I haven't seen those extended shapes at upper right and around the brighter nebula before. I have published the same image in visual color palette, it can be seen here, https://astroanarchy.blogspot.com/2020/01/deep-view-to-california-nebula-ngc-1499.html
A closeup
Please, click for a full size image
A very good resolution for the 300mm camera lens
An experimental starless version
Please, click for a full size image
Various shapes in nebula are easier to see when stars are removed.
INFO
A closeup
Please, click for a full size image
An experimental starless version
Please, click for a full size image
INFO
The California Nebula is an emission area located in constellation Perseus. It appears to resemble outlines of State of California on long exposure photographs, like this one. It has a very low surface brightness and it's very difficult to observe visually. Distance from my hometown Oulu, Finland, is about 1000 light years.
this image spans around five degrees horizontally. The Wikipedia article states, that the angular size is about 2,5 degrees (Five full Moons side by side) but as can be seen in this image, the actual size, with a dim outer parts, is much large.
H-alpha exposure alone
Please, click for a full size image
H-alpha image contains seven 20 min sub exposures stacked together. Exposure time is 2h 20 min..
Technical details
Processing workflow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Tokina AT-x 300mm f2.8 camera lens
Mount
10-micron 1000
Cameras, filters and guiding
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 7 x 1200 s, binned 1x1 = 2 h 20 min.
O-III, 2x 1200 s, binned 2x2 = 40 min.
S-II, 2x1200 s binned 2x2 = 40 min.
The apparent scale in a sky
Please, click for a full size image
This is a large object
NOTE, the apparent size of the full moon is marked in all of the images above.
The angular dimension of the moon is 30 arcminutes, that's 0,5 degrees.
More info about this photo from the year 2012 here, https://astroanarchy.blogspot.com/2012/02/california-nebula-ngc-1499-with-some.html
Thursday, January 23, 2020
A deep view to the California Nebula, NGC 1499
beautifully rounded stars..
California Nebula, NGC 1499
Please, click for a full size image
Image is in natural colors combined from the narrowband channels. H-alpha = Red, O-III = Green and O-III + 20% H-alpha = Blue. This is a very deep image, I haven't seen those extended shapes at upper right and around the brighter nebula.
INFO
The California Nebula is an emission area located in constellation Perseus. It appears to resemble outlines of State of California on long exposure photographs, like this one. It has a very low surface brightness and it's very difficult to observe visually. Distance from my hometown Oulu, Finland, is about 1000 light years.
this image spans around five degrees horizontally. The Wikipedia article states, that the angular size is about 2,5 degrees (Five full Moons side by side) but as can be seen in this image, the actual size, with a dim outer parts, is much large.
This is a large object, note, the size of the Moon is marked, as a scale, in all of the images above.
H-alpha exposure alone
Please, click for a full size image
H-alpha image contains seven 20 min sub exposures stacked together. Exposure time is 2h 20 min..
Technical details
Processing workflow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Tokina AT-x 300mm f2.8 camera lens
Mount
10-micron 1000
Cameras, filters and guiding
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 7 x 1200 s, binned 1x1 = 2 h 20 min.
O-III, 2x 1200 s, binned 2x2 = 40 min.
On older image of California nebula in mapped colors
The apparent scale in a sky
Please, click for a full size image
This is a large object, note, the size of the Moon is marked, as a scale, in all of the images above.
More info about his photo from the year 2012 here, https://astroanarchy.blogspot.com/2012/02/california-nebula-ngc-1499-with-some.html
Sunday, January 19, 2020
An animated Heart Nebula, IC1805 with and without stars
My "new" imaging system combines a Tokina AT-x 300mm f2.8 lens to a large CCD of Apogee Alta U16 astro camera with 4096x4096 9 micron pixels. This combination has a resolution of about 5 arc seconds/pixels. Undersampling imaging system is a great tool to bring out very dim and diffused nebulae very fast. This photo of Heart Nebula has only 2h of H-alpha light and just 30 min O-III light.
IC 1805 without stars
Please, click for a full size image
It's easier to see the actual nebula when stars are removed. Human brains has a tendency to form quasi logical shapes and forms from a random cloud of dots. Famous example of this phenomena is Percival Lowell and canals of Mars.
An animated image, IC 1805 with and without stars
Please, click for a full size image
Technical details
Processing workflow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Tokina AT-x 300mm f2.8 camera lens
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 12 x 600 s, binned 1x1 = 2 h
O-III, 3x 600 s, binned 1x1 = 30 min..
O-III, 3x 600 s, binned 1x1 = 30 min..
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