|
|
|
Instrument |
12.5" RCOS @ ~f/9
(2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale is
1.28 to 3.49 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
12/7/2012 to 2/4/2013 Chino Valley, AZ... with CCDAutoPilot5
& CCDSoft. Off-axis guided. |
|
Exposure |
|
Lum |
840
min. (28 x 30 min. bin 1x1) |
|
RGB |
360 min. ( 8 x
15 min. each bin 2x2) |
|
OIII
|
480 min. (16 x 30 min.
bin 1x1)
|
|
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS6, PixInsight and Noel Carboni's actions.
-
No SDSS stars were
available for color balancing, so a standard image-train
color
calibration was used, as determined by
eXcalibrator and then adjusted for altitude extinction.
-
CCDBand-Aid
to repair STL-11000M vertical bars.
-
CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures and
create the RGB image.
-
PixInsight for
gradient removal and
initial non-linear stretching.
-
PhotoShop for the LRGB
combine & final touch-up.
-
Noiseware 5, a PhotoShop plug-in.
|
|
Comment |
North is to the top.
William Herschel
discovered NGC 1514 and 1790. The planetary nebula, also known as
the Crystal Ball Nebula, is in the constellation Taurus at a
distance of 800 light-years. It thought that the nebula envelops a
tightly orbiting double star with a period of about 10 days. Gas is
presumably expanding away from the larger star of the pair. The
image also shows part of a large expanse of interstellar cirrus.
|
|
