|
Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at
2.93 and 5.29 arcsec/pixel. |
|
Mount |
Losmandy G11 with Gemini L4 v1.0 |
|
Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using Baader RGB filters. |
|
Acquisition Data |
2/8/2015 &
2/10/2015
Chino Valley, AZ |
|
Exposure |
|
Red |
70 min. (10 x
7 min.) bin 1x1 |
|
Green
|
84 min. (12 x 7 min.)
" |
|
Blue
|
105 min. (15 x 7 min.)
" |
eXcalibrator RGB
ratios are 1.00, 1.22, 1.39 |
|
Software |
-
CCDSoft, CCDStack,
PixInsight & Photoshop CS6.
-
eXcalibrator
v4.36 for (g:r) color balancing, using
798 stars from the
SDSS-DR9 database.
-
CCDStack to
calibrate all sub exposures, register, stack and create the RGB image.
-
PixInsight
processing includes gradient removal and non-linear stretching
with HistogramTransformation.
-
PhotoShop for
the final touch up.
|
|
Comment |
North is to the
top.
M35, or NGC 2168, is
an open cluster in the constellation Gemini, at a distance of about
2800 light years. At only 150 million years old, M35 s a classic
example of a young open cluster with very hot young blue stars.
To the lower right is the tightly grouped cluster NGC 2158. This
cluster is about 2 billion years old. The much older stars of the
cluster account for its yellowish color. It is about 9000 light
years further away than M35. This greater distance may also slightly
contribute to the yellowish color.
To the far right–center are the two sparse clusters IC2156 and 2157. |
