Hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  M 33  ·  NGC 598  ·  Triangulum galaxy
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M33, Triangulum Galaxy, 


M33, Triangulum Galaxy
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M33, Triangulum Galaxy

Technical card

Imaging telescopes or lenses: Teleskop Service TS Photoline 107mm f/6.5 Super-Apo

Imaging cameras: SBIG STF-8300M

Mounts: Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: Teleskop Service TS Photoline 107mm f/6.5 Super-Apo

Guiding cameras: QHY5L-II Mono

Software: Sequence Generator Pro  ·  PixInsight  ·  Adobe Photoshop CS4  ·  Annie's Astro Actions  ·  Stark Labs PHD2 v2.3.0  ·  Astrometry.net Local Solver  ·  EQASCOM  ·  Cartes du Ciel  ·  Elbrus  ·  ProDigital Software Carbonis Actions

Filters: Astrodon 5nm H-alpha  ·  Astrodon LRGB Tru-Balance E-series

Accessory: Teleskop Service TSFlat2 field flattener  ·  Starlight Xpress Slimline OAG  ·  Starlight Xpress SX USB Filter Wheel 7x36mm  ·  Dew-Not heater strip  ·  Ronald J. Keating Jr DewBuster Controller

Dates:Sept. 11, 2015Sept. 13, 2015Sept. 14, 2015

Astrodon 5nm H-alpha: 12x1200" bin 1x1
Astrodon Blue Tru-Balance E-series: 13x600" bin 1x1
Astrodon Green Tru-Balance E-series: 13x600" bin 1x1
Astrodon Luminance Tru-Balance E-series: 28x900" -10C bin 1x1
Astrodon Red Tru-Balance E-series: 13x600" bin 1x1

Integration: 17.5 hours

Darks: ~20

Flats: ~30

Bias: ~100

Avg. Moon age: 9.74 days

Avg. Moon phase: 1.42%

Basic astrometry details

Astrometry.net job: 833378

RA center: 1h 33' 52"

DEC center: +30° 40' 1"

Pixel scale: 1.582 arcsec/pixel

Orientation: 89.204 degrees

Field radius: 0.791 degrees

Resolution: 2658x2431

Locations: Little Piney Observatory, Hagarville, Arkansas, United States


This is one I've been holding on to for a while. I'm glad I saved it with all the clouds and rain we've seen lately around here. Truth be told though, I actually walked away from it and then nearly forgot about it. M33, in spite of its brightness, is probably the toughest galaxy to process. Adding Ha into the equation seemed to make it even tougher for me. I finally have something I am halfway pleased with, so I published it here. Would have been very disappointed if I hadnt after spending 20 hrs acquiring the data and countless more in front of the computer monitor!!! :P

I was also in the middle of another project and couldnt rotate my camera. It needed rotating to frame this galaxy the way I wanted with the 107mm/8300 camera, so I had to rotate the image and crop it.

Revision B is annotated.



  • M33, Triangulum Galaxy, 


  • M33, Triangulum Galaxy, 


  • M33, Triangulum Galaxy, 


  • Final
    M33, Triangulum Galaxy, 



Sky plot

Sky plot


M33, Triangulum Galaxy,