NGC7000 - The
North America Nebula
Click the
image to see full size (7.54"/pixel).
NGC7000 - The North America Nebula, 06.10.2004 (22:07
-23:44 UT)
Resolution: 9.43 arcsec/pixel
Object altitude: 53° - 38°
Camera: SAC8
+ 0.6x Mogg focal reducer
Telescope: 80mm
F5 Skywatcher refractor
Result focal ratio: F3
Filters: Astronomik
H-alpha
Exposure: 72x14s (gain 100%, Hi-Res, Amp Off),
mosaic of 4 frames
Capturing: K3CCDTools
2
Processing: K3CCDTools 2, Loreal,
iMerge,
Corel PhotoPaint
Seeing: lim.magnitude for naked eye 4.2, medium
transparency
Conditions: temperature 10.2°C, 62% humidityAstronomik
H-alpha filter showed perfect
performance. You can compare the photos taken
before - without H-alpha filter.
Processing:
1, Stacked by K3CCDTools 2 with 16-bit DF (135x14s)
and artificial FF
2, Histogram stretching and gamma 2.2 in K3CCDTools
3, Rotation (to eliminate wrong polar alignment)
in K3APEX
3, Mosaic from 4 result frames created in iMerge
4, "black ghost" on the right side of
bright stars were removed by Loreal
5, Final resizing, contrast enhancement and
adaptive unsharp mask Corel PhotoPaint.
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Colorized version created from the above picture:
1, Grayscale image converted to RGB
2, G and B layers cleared - the result is RGB red
colored picture
3, Gamma 2.40 applied to RGB red
4, Grayscale and RGB red version are layered in
PhotoPaint and used overlay
merge mode |
Detail of bottom part of nebula - one of the 4
frames creating the above mosaic
Exposure: 72x14s (gain 100%, Hi-Res, Amp Off)
Resolution: 6.50 arcsec/pixel
Processed by K3APEX (Digital
Development filter).
|
Click the
image to see full size (16.45"/pixel). |
NGC7000
- The North America Nebula, 17.09.2004 (23:29 -00:10
UT)
Resolution: 27.88 arcsec/pixel
Camera: SAC8
+ 0.6x Mogg focal reducer
Telescope: 80mm
F5 Skywatcher refractor
Result focal ratio: F3
Exposure: 30x02s (gain 100%, binned, Amp Off),
mosaic of 12 frames
Capturing: K3CCDTools
2
Processing: K3CCDTools 2, Loreal,
iMerge,
Corel PhotoPaint
Seeing: lim.magnitude for naked eye 4.5, good
transparency
Conditions: temperature 10.2°C, 62% humidityProcessing:
1. Stacked by K3CCDTools 2 with DF and artificial
FF
2, 12 result frames were processed by Loreal
3, Mosaic created in iMerge
4, Horizontal bands (caused by SAC8 camera) were
supressed by processing in Corel PhotoPaint
5, Final histogram tweaking and gamma 0.85 in
Corel PhotoPaint. Then the whole mosaic was
resized to 24% and 40% for web
Note: No filters were used. The object is much
better visible if Hydrogen alfa filter is used.
|
 |
This is artificially colorized
version of the above picture. Colorization was
done in Corel PhotoPaint. |
Click the
image to see the full 100% size (6.50"/pixel). |
"Mexico" part of above
NGC7000. The part of the result mosaic was
resized to 50% (13.16"/pixel) |
Click the
image to see full size (23.1"/pixel).
Click here to see the image
with logarithmic brightness scale. |
NGC7000
- The North America Nebula, 9.12.2001 (19:30 -19:55
UT)
Resolution: 46.2 arcsec/pixel
Camera: Vesta 675SC piggyback at 8" Europa,
GEM1
Objective: 2/50 Flexon
Exposure: 25x60s (gain 0%), 10xDF
Seeing: lim.magnitude for naked eye 4.5The
nebula with North America shape.
Gain of webcam was set to 0% to suppress the
noise of camera. The noise usually affect the
quality of image, because the compression of data
is wasted for compressing the noise and star
images are poor. Such large field photo contains
a lot of stars, that means it contains a lot of
information to be compressed.
|
Click the
image to see more processing results. |
NGC7000
- The North America Nebula, 10.11.2001 (21:31 -
21:42 UT)
Resolution: 46.2 arcsec/pixel
Camera: Vesta 675SC piggyback at 8" Europa,
GEM1
Objective: 2/50 Flexon
Exposure: 40x16s (gain 80%), 40xDF
Seeing: lim.magnitude for naked eye 4.5The
nebula with North America shape. Not the whole
nebula is visible in the photo. The brightest
star on the right side is Deneb (a Cygni).
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permission of author.
Last Update: 09.10.2004
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