|
Instrument |
12.5" RCOS @ ~ f/9
(2880 mm fl) at 0.64 arcsec/pixel. Shown at 1.26 and 3.03 arcsec/pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ FW8
filter wheel & AstroDon Gen-2 RGB and 6mn Ha filters. |
|
Acquisition Data |
7/7/2015 to 7/28/2015
Chino Valley, AZ with CCD Commander & CCDSoft. |
|
Exposure |
|
RGB |
480 min. (16
x 10 min. each) binned 1x1 |
|
Ha |
360 min. (24
x 15 min. each) binned 1x1 |
RGB
ratios are 1.00, 1.06 1.20
Click
here for an Ha filtered b/w
image. |
|
Software |
-
CCDSoft, PixInsight & Photoshop CS6.
-
eXcalibrator v5.0 for
(g:r)
color balancing, using 89 stars from the APASS database.
-
CCDStack to
calibrate all sub exposures and create the RGB image.
-
PixInsight to
register, normalize, data reject, combine the luminance & Ha sub
exposures and non-linear stretching with HistogramTransformation.
-
PhotoShop for
adding the Ha data and the final touch up.
|
|
Comment |
North is to the
top.
Sh2-98 is a faint
emission nebula, in the constellation of Cygnus, at a distance of
about 11,700 light-years. |
