Hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  IC131  ·  IC132  ·  IC133  ·  IC135  ·  IC136  ·  IC137  ·  IC142  ·  IC143  ·  M 33  ·  M33  ·  NGC 598  ·  NGC588  ·  NGC592  ·  NGC595  ·  NGC604  ·  Triangulum galaxy
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Triangulum Galaxy (M33), 


            Luca Marinelli
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Triangulum Galaxy (M33)

Imaging telescopes or lenses: Takahashi FSQ 106 EDX4

Imaging cameras: Starlight Xpress Trius SX-814 mono

Mounts: Astro-Physics Mach-1 GTO CP4

Guiding telescopes or lenses: Baader Planetarium Baader Vario 60mm F4.1

Guiding cameras: ZWO ASI 290 MM MINI

Software: Photoshop CC  ·  PIXINSIGHT 1.8  ·  Lightroom CC  ·  Seqence Generator Pro

Filters: Astrodon Narrowband 3nm Ha  ·  Astrodon Tru-Balance Gen2 E-Series - B 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - G 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - R 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - L 36mm

Accessory: Optec FocusLynx QuickSync FSQ Motor

Dates:Oct. 4, 2018Oct. 5, 2018Oct. 9, 2018Oct. 10, 2018Oct. 18, 2018

Astrodon Tru-Balance Gen2 E-Series - B 36mm: 24x240" -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 26x240" -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - L 36mm: 137x60" bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 37x240" bin 1x1
Astrodon Narrowband 3nm Ha: 11x900" bin 1x1

Integration: 10.8 hours

Darks: ~40

Flats: ~30

Bias: ~100

Avg. Moon age: 12.13 days

Avg. Moon phase: 22.56%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2329158

RA center: 1h 33' 50"

DEC center: +30° 39' 37"

Pixel scale: 1.432 arcsec/pixel

Orientation: -101.672 degrees

Field radius: 0.783 degrees

Resolution: 3122x2398

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard


First light for a new to me Starlight Xpress Trius SX-814 mono camera. The data is wonderfully clean and a joy to work with.

Triangulum Galaxy (Messier 33) is a spiral galaxy approximately 3 million light years from Earth in the constellation Triangulum. Together with Andromeda and its satellite galaxies it is part of the Milky Way local group. M33 has very prominent and large HII regions, associated with intense star formation.



  • Final
    Triangulum Galaxy (M33), 


            Luca Marinelli
  • Triangulum Galaxy (M33), 


            Luca Marinelli
  • Triangulum Galaxy (M33), 


            Luca Marinelli


Description: Ha data inverted and annotated to display the vast number of HII regions in M33. They include a number of supernova remnants and ring-like nebulas surrounding Wolf-Rayet stars. These objects have been cataloged in the '80s and '90s (see panel D).

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Description: Figure from Courtes, Petit, Sivan, Dodonov, Petit, Ha survey of M33 with the six-meter telescope: morphology of the general diffuse emission, evidence for a chaotic medium of bubbles and filaments, Astron. Astrophys. 174, 28-56 (1987).

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Sky plot

Sky plot


Triangulum Galaxy (M33), 


            Luca Marinelli