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M33 Triangulum Galaxy, 


            Thomas LELU

M33 Triangulum Galaxy

Imaging telescopes or lenses: ASA - Astro Systeme Austria ASA 10'

Imaging cameras: Moravian G2-4000

Mounts: Paramount MyT

Guiding telescopes or lenses: ASA - Astro Systeme Austria ASA 10'

Guiding cameras: Moravian G1-0300

Focal reducers: ASA - Astro System Austria ASA 3" Wynne Reducer Korrektor 0,95x

Software: The SkyX Pro  ·  MaxPilote  ·  PIXINSIGHT PixInsinght 1.8 RC7  ·  Photoshop CS6 Extended

Filters: Astrodon Ha 5nm  ·  Astrodon Blue  ·  Astrodon Red  ·  Astrodon Luminance  ·  Astrodon Green

Accessory: résistance chauffante

Dates:Oct. 24, 2018

Astrodon Blue: 15x600" (2h 30') bin 1x1
Astrodon Green: 15x600" (2h 30') bin 1x1
Astrodon Ha 5nm: 34x900" (8h 30') bin 1x1
Astrodon Luminance: 46x600" (7h 40') bin 1x1
Astrodon Red: 15x600" (2h 30') bin 1x1

Integration: 23h 40'

Avg. Moon age: 14.55 days

Avg. Moon phase: 99.95%

Basic astrometry details job: 2335549

Resolution: 130x130

Locations: Jardin, TOUL, Lorraine, France

Data source: Own remote observatory

Remote source: Non-commercial independent facility


The galaxy gets its name from the constellation Triangulum, which is where it can be spotted.

The Triangulum Galaxy is sometimes informally referred to as the "Pinwheel Galaxy" by some amateur astronomy references and in some public outreach websites. However, the SIMBAD Astronomical Database, a professional astronomy database that contains formal designations for astronomical objects, indicates that the name Pinwheel Galaxy is used to refer to Messier 101, and several other amateur astronomy resources and other public outreach websites also identify Messier 101 by that name.

This galaxy has an inclination of 54° to the line of sight from the Earth, allowing the structure to be examined without significant obstruction by gas and dust. There may be a halo surrounding the galaxy, but there is no bulge at the nucleus. This is an isolated galaxy and there are no indications of recent mergers or interactions with other galaxies, and it lacks the dwarf spheroidals or tidal tails associated with the Milky Way.

Triangulum is classified as unbarred, but an analysis of the galaxy shape shows what may be a weak bar-like structure about the galactic nucleus. The nucleus of this galaxy is an H II region, and it contains an ultraluminous X-ray source, which is the most luminous source of X-rays in the Local Group of galaxies. This source is modulated by 20% over a 106-day cycle. However, the nucleus does not appear to contain a supermassive black hole, as an upper limit of 3,000 solar masses is placed on the mass of a central black hole based upon the velocity of stars in the core region.

The inner part of the galaxy has two luminous spiral arms, along with multiple spurs that connect the inner to the outer spiral features. The main arms are designated IN (north) and IS (south).



  • M33 Triangulum Galaxy, 


            Thomas LELU
  • M33 Triangulum Galaxy, 


            Thomas LELU
  • M33 Triangulum Galaxy, 


            Thomas LELU
  • M33 Triangulum Galaxy, 


            Thomas LELU
  • Final
    M33 Triangulum Galaxy, 


            Thomas LELU


M33 Triangulum Galaxy, 


            Thomas LELU