|
Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at
3.97 and 8.48 arcsec/pixel. |
|
Mount |
Losmandy G11 with Gemini L4 v1.0 |
|
Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using an AstroDon 5nm Ha and Baader RGB filters. |
|
Acquisition Data |
8/17/2014 to 9/30/2014 Chino Valley, AZ... with
CCD Commander & CCDSoft. |
|
Exposure |
|
Ha |
360
min. (24 x 15 min. bin 1x1) |
|
Red |
168 min. (24 x
7 min. each bin 1x1) |
|
Green
|
154 min. (22 x 7 min. each bin 1x1)
|
|
Blue
|
252 min. (36 x 7 min. each bin 1x1)
|
RGB ratios are 1.00, 1.21 & 1.41 |
|
Software & Processing Notes |
-
CCDSoft, CCDStack, PixInsight
and Photoshop CS6.
-
A standard
image-train calibration was used, as determined by
eXcalibrator v4.30, and then adjusted for altitude
extinction.
-
CCDStack to
calibrate, register, normalize, data reject and mean combine the
RGB sub
exposures and creating the RGB
image.
-
PixInsight
processing includes gradient repair, non-linear stretching with
HistogramTransformation and HDRMultiscaleTransform. .
-
PhotoShop for
adding the Ha data to the red channel & final touch-up.
-
Noiseware 5, a
PhotoShop plug-in.
-
Click here
for the color-mapped NarrowBand images
Click here for the Ha image.
|
|
Comment |
North is to the top.
The Elephant's Trunk
Nebula is an elongated dark globule within the emission nebula IC
1396 in the constellation of Cepheus. Located at a distance of 2,450
light-years, the globule is a condensation of dense gas that is
barely surviving the strong ionizing radiation from a nearby massive
star. The globule is being compressed by the surrounding ionized
gas.
Source:
NASA APOD |
