Hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  M 33  ·  NGC 595  ·  NGC 598  ·  NGC 604  ·  Triangulum Galaxy  ·  Triangulum Pinwheel
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M33 the Triangulum Galaxy, 



    
        

            Andrew Arai
M33 the Triangulum Galaxy
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M33 the Triangulum Galaxy

Getting plate-solving status, please wait...
M33 the Triangulum Galaxy, 



    
        

            Andrew Arai
M33 the Triangulum Galaxy
Powered byPixInsight

M33 the Triangulum Galaxy

Technical card

Imaging telescopes or lenses: Astro-Physics AP 130EDFGT

Imaging cameras: ZWO ASI2600MC

Mounts: Astro-Physics Mach1AP GTO

Guiding telescopes or lenses: Astro-Physics AP 130EDFGT

Guiding cameras: ZWO ASI174MM mini

Focal reducers: Astro-Physics Inc 2.7" Prime Focus Field Flattener (67PF562)

Software: Pleaides Astrophoto PinInsight 1.8  ·  Photoshop  ·  http:/openphdguiding.org PHD2 Guiding 2.6.9

Accessory: Starlight Xpress OAG  ·  StarLight Xpress Filter Wheel


Dates:Jan. 15, 2021

Frames:
3x1000" (50') (gain: 100.00) -15C bin 1x1
19x300" (1h 35') (gain: 100.00) -15C bin 1x1

Integration: 2h 25'

Darks: ~14

Flats: ~4

Bias: ~50

Avg. Moon age: 2.38 days

Avg. Moon phase: 6.27%

Bortle Dark-Sky Scale: 2.00


Basic astrometry details

Astrometry.net job: 4317777

RA center: 1h 33' 52"

DEC center: +30° 39' 21"

Pixel scale: 0.899 arcsec/pixel

Orientation: 272.737 degrees

Field radius: 0.766 degrees


Resolution: 5200x3250

Locations: Wupatki National Monument, Flagstaff, Arizona, United States

Data source: Traveller

Description

The Triangulum Galaxy (M33) is the third largest galaxy in the Local Group after the Andromeda Galaxy and our Milky Way Galaxy.(1)(2) Although M33 is relatively bright (magnitude 5.7) that light is spread out over over an area of the sky about 3.25 times larger than a full moon making M33 about 150 times less bright per area than the full moon.(3) A few days prior to imaging M33, I observed the galaxy with some friends through the same telescope at very low magnification (34x) in a wide field eyepiece able to see a 2.4 degree field of view at a dark site . It was also quite obvious through the 50 mm finder scope. What catches my attention is that M33 had a visually oval appearance with relatively distinct edges. This appearance is quite different from the Andromeda Galaxy (M31) where the visual appearance is dominated by the bright core of the galaxy and the edges fade away indistinctly, often quite far from the photographically detected borders.

I was at a recognized Dark Sky site, Wupatki National Monument, for this imaging session with probably Bortle 2 skies. There were a few clouds which appeared black against the sky, a sign of very low light pollution. Otherwise the sky seemed very dark and transparent to me. I lost several exposures to focus imperfections and two due to motion from sudden strong wind gusts. As always, more imaging time would help a lot.

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Sky plot

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Histogram

M33 the Triangulum Galaxy, 



    
        

            Andrew Arai