|
Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at
4.34 and 9.26 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 |
3/21/2015 to
3/24/2015 Chino Valley, AZ... with CCDSoft & CCD Commander |
|
Exposure |
|
Red |
84 min. (12 x
7 min. bin 1x1) |
|
Green |
84 min. (12 x 7 min. bin 1x1)
|
|
Blue
|
126 min. (18 x 7 min. bin 1x1)
|
RGB combine
ratios were 1.0, 1.25 & 1.49 |
|
Software & Processing Notes |
-
CCDSoft, CCDStack,
PixInsight & Photoshop CS6.
-
A standard image-train
calibration was used, as determined by
eXcalibrator v4.30, and then adjusted for altitude
extinction.
-
CCDStack to
calibrate all sub exposures, register, stack
and create RGB image.
-
PixInsight
processing includes registration and stacking gradient repair, non-linear stretching with HistogramTransformation.
-
PhotoShop for final touch-up.
|
|
Comment |
North is to the top.
M46 (NGC 2437) is an
open cluster in the constellation Puppis. Charles Messier discovered
the cluster in 1771. M46 is believed to be about 300 million old and
at a distance of about 5500 light years.
The planetary nebula, NGC 2438, is in front of M46 at a distance
about 3000 light years. Herschel discovered the nebula on March 19,
1786.
The cluster, M47 (NGC 2422) is about 1600 light years away and is
only 78 million years old. Giovanni Batista Hodierna discovered it
in 1654.
At about 2.2 billion years, NGC 2425 is a much older cluster and is
about about 11,000 Light years from Earth. This intermediate age
explains the absence of bright blue stars.
There is little available information about the planetary nebulae PN
M 1-18 and PN G231.1+03.9. 27. |
