|
|
Click the
image for an ~ 50% size wide view. (1950 x 1300)
|
On the far left and below center
there
appears to be a non-cataloged LSB (low surface
brightness) dwarf galaxy, that may be associated
with NGC 891. These little guys are everywhere, but
difficult to get pro observatory telescope time
allocated for their study. They are interesting, in
that they seem to contain very significant amounts
of dark matter. This object can also be found in the
SDSS-II images. |
|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.643 arcsec / pixel. Zoomify image scale is
0.86 to 3.44 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon Filters |
|
Acquisition Data |
10/24/2009 to 11/22/2009 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft. |
|
Exposure |
Lum
300 min (10 x 30 min, bin 1x1)
RGB
270 min ( 3 x 30 min each, bin 2x2) |
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS w/ the Fits Liberator plugin. Noel Carboni's actions
and Russell Croman's GradientXTerminator.
-
Noel Carboni's
StarSpikes Pro was used to
restore and sharpen the normal spider defraction spikes.
-
eXcalibrator
for (b-v) color calibration, using 15
stars from the NOMAD1 database.
-
PixFix32 (pre-beta) to
repair hot/cold pixels and column defects.
-
CCDStack to calibrate, register,
normalize, data reject, combine the sub exposures & LRGB color.
-
PhotoShop for LLRGB
combine &
on-linear stretching.
|
|
Comment |
North is to the left.
Discovered on October
6, 1784 by William Herschel, NGC 891 is about 30 million light-years
way in the constellation Andromeda. From our perspective the
unbarred spiral galaxy presents a beautiful edge on view.
|
════════════════════════════════════════
Click the
image for fullsize wide field view
|
Instrument |
Celestron
C11 @ ~f/10.5 (~2930 mm fl) 1.27 arcsec / pixel. Shown
resampled to 1.58 arcsec / pixel. Click the image for a full
size wide field view. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon Filters |
|
Acquisition Date |
10/14/07 to 10/18/07
Chino Valley... with CCDAutoPilot3 |
|
Exposure |
Lum
240 min. (48 x 5 bin 2x2)
RGB 120 min. (24 x 5 bin 3x3) each |
|
Software |
CCDSoft,
Sigma-Clip, Photoshop CS w/ the Fits Liberator plugin, Paint Shop
Pro,and Noel
Carboni's actions |
|
Comment |
North is to the
top
Discovered by William Herschel in 1784. NGC 891 is at a
distance of 30 Million Light Years. |
════════════════════════════════════════
|
Instrument |
Celestron C11 @ F/7.2
(2000 mm fl) 0.93 arcsec / pixel |
|
Mount |
Losmandy G11 |
|
Camera |
SBIG ST-7 with
CFW-8A color wheel |
|
Acquisition Date |
3/19/04 to 4/2/04
Near downtown Seattle |
|
Exposure |
Lum
555 min. (37 x 15)
Red 120 min (8 x 15 bin 2x2)
Green 105 min. (7 x 15 bin 2x2)
Blue 150 min. (10 x 15 bin 2x2) |
|
Software |
CCDSoft,
Sigma-Clip, Photoshop CS w/ the Fits Liberator plugin & Iris |
|
