|
Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at
4.2 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 RGB filters. |
|
Acquisition Data |
10/26/2013
to 12/1/2013 Chino Valley, AZ... with CCDAutoPilot5 & CCDSoft. |
|
Exposure |
|
Lum |
435 min. (29 x
15 min. each bin 1x1) |
|
Red |
135 min. ( 9 x
15 min. " |
|
Green
|
165 min. (11 x 15 min.
" |
|
Blue
|
195 min. (13 x 15 min.
" |
|
Ha
|
330 min. (22 x 15 min.
" |
|
|
Software & Processing Notes |
-
CCDSoft, CCDStack, PixInsight
and Photoshop CS6.
-
eXcalibrator v4.25
for (g:r) color balancing, using 327 stars from the SDSS-DR9
database.
-
CCDStack to
calibrate, register, normalize, data reject, combine the sub
exposures and to create the RGB
image.
-
PixInsight for
gradient removal and initial non-linear stretching.
-
PhotoShop for the
[L:Ha][R:Ha]GB
combine and final touch-up.
-
Noiseware 5, a
PhotoShop plug-in.
|
|
Comment |
North is to the
right.
M33 is located in the
constellation Triangulum, at a distance of about 2.7 million
light-years. As the third largest galaxy in our local group, M33 is
the most distant object visible to the naked eye. The first
historical mention of the galaxy was by the Italian astronomer
Giovanni Battista Hodierna before 1654. It was independently
discovered by Charles Messier in 1764 and added to his famous
catalog as entry number 33, hence the designation of M33.
M33 contains many huge and bright HII star-forming regions; three
even have NGC identifications. The largest, NHC 604, is located near
the top of the image at about 1:00 o'clock from the galaxy center.
NGC 595 is down a bit at 5 o'clock and NGC 588 is at the very
bottom, image center. The lower image was taken with an Ha filter
and mainly shows just the HII regions.
For more info please see
Wikipedia.
|
