A nice South African City image:
The Triangulum Galaxy (M33)
Image by Martin_Heigan
The Triangulum Galaxy is a Spiral Galaxy approximately 3 million light-years from Earth in the constellation Triangulum. It is catalogued as Messier 33, M33 or NGC 598.
The Triangulum Galaxy is the third-largest member of the Local Group of Galaxies, which includes the Milky Way Galaxy, the Andromeda Galaxy and about 44 other smaller Galaxies. It is one of the most distant deep sky objects that can be viewed with the naked eye.
Imaged not too far out of the city, in semi-dark rural skies in North-West Province (South Africa).
Gear:
William Optics Star 71mm f/4.9 Imaging APO Refractor.
William Optics 50mm Finder Scope.
Celestron SkySync GPS Accessory.
Orion Mini 50mm Guide Scope.
Orion StarShoot Autoguider.
Celestron AVX Mount.
QHYCCD PoleMaster.
Celestron StarSense.
Canon 60Da DSLR.
Astronomik Clip-In CLS Light Pollution Filter.
Baader H-alpha 7nm Narrowband Filter.
Tech:
Guiding in Open PHD 2.6.1.
Image acquisition in Sequence Generator Pro.
Lights/Subs:
18 x 180 sec. ISO 3200 CFA FIT (CLS RGB).
12 x 300 sec. ISO 3200 CFA FIT (Ha).
Calibration Frames:
40 x Bias.
25 x Darks.
20 x Flats & Dark Flats.
Pre-Processing and Linear workflow in PixInsight,
and finished in Photoshop.
Astrometry Info:
Annotated Sky Chart for this image.
RA, Dec center: 23.4552543268, 30.6762436037 degrees
Orientation: 0.406298618966 deg E of N
Pixel scale: 1.46179748229 arcsec/pixel
View image in the World Wide Telescope.
Martin
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