|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 1.28 and 3.08 arcsec/pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
FW8 filter wheel, AstroDon 6nm Ha and 3mn OIII filters. |
|
Acquisition Data |
8/2/2015
to 8/24/2015 Chino Valley, AZ... with CCD Commander & CCDSoft,
AOL guided. |
|
Exposure |
|
Ha |
900 min.
(30 x 30 min. Bin 1x1) |
|
OIII |
1170 min. (39 x
30 min. Bin 1x1) |
|
|
Software & Processing Notes |
-
CCDSoft, CCDStack,
PixInsight, Photoshop CS6.
-
CCDBand-Aid to repair
KAI-11000M vertical bars.
-
CCDStack to
calibrate the sub exposures.
-
PixInsight
processing includes
registration, stacking, RGB creation, gradient removal and non-linear stretching with HistogramTransformation.
-
PhotoShop for the final touch-up.
|
|
Comment |
North is to the left.
Although this image
was taken with narrow band filters it is a fairly good presentation
of what the nebula looks like if red, green and blue filters were
used. This is possible because the band width of the OIII filter is
about half way between green and blue. This technique works
especially well with this nebula because the RGB colors are mostly
red and cyan.
These wisps of gas are
all that remain visible of a Milky Way star. Many thousands of years
ago that star exploded in a supernova leaving the Veil Nebula. At
the time, the expanding cloud was likely as bright as a crescent
Moon toward the constellation of Cygnus, visible for weeks to people
living at the dawn of recorded history. The remaining supernova
remnant lies about 1400 light-years away and covers over five times
the size of the full Moon. The
Veil Nebula is also known as the Cygnus Loop.
Source:
NASA APOD |
