|
Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at 3.91 and
9.39 arcsec/pixel. |
|
Mount |
Losmandy G11 with Gemini L4 v1.0 |
|
Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using Baader LRGB filters. |
|
Acquisition Data |
Taken 8/6/2014 to
11/27/2014 Chino Valley, AZ. |
|
Exposure |
|
Lum |
672 min. (96 x
7 min.) binned 1x1 |
|
Red |
168 min. (24 x
7 min.) " |
|
Green
|
196 min. (28 x 7 min.)
" |
|
Blue
|
364 min. (52 x 7 min.)
" |
RGB ratios are 1.00, 1.23 &
2.03 |
|
Software & Processing Notes |
-
CCDSoft, CCDStack,
PixInsight & Photoshop CS6.
-
eXcalibrator
v4.36 for (b-v), (v-r) color balancing, using 75 stars from the
NOMAD1 database.
-
CCDStack to
calibrate all sub exposures, register and stack the color and create the RGB image.
-
PixInsight
processing includes registering and stacking the luminance,
RGB background neutralization, non-linear stretching with HistogramTransformation,
and LRGB creation.
-
PhotoShop for
the final touch up.
-
Noiseware 5, a
PhotoShop plug-in.
|
|
Comment |
North is to the
top.
LDN 1247 and 1251 are
two molecular clouds in the constellation Cepheus. LDN 1247 is the
smaller dark nebula just to the right of center. LDN 1251 is the
larger elongated structure on the left. LDN 1251 contains about 15
Young Stellar Objects and about 25 YSO candidates. These are stars
in the early stages of evolution. They are often associated with
early star phenomena such as jets and bipolar overflows, masers,
Herbig-Haro objects, and protoplanetary disks.
There are several Herbig-Haro objects scattered about LDN 1251. In
the 1940s, George Herbig and Guillermo Haro independently studied
and identified these objects as a distinct type of the emission
nebula. The nebulae are associated with newly born stars. Several
are often seen around a single star and aligned with star's
rotational axis. |
