2022 Michael A. Siniscalchi

What's New



Odds n Ends

           Messier 33     
       Spiral Galaxy in Triangulum
      RA:01h 33m 47s  Dec: +30 30' 00" Distance - ~2.73 million ly  Size ~60,000 ly

Click on image for larger size
Location & Date
Backyard, Abbott Observatory- Long Island, NY,  September 2021
Orion ED80 F/7 APO, Moonlite focuser, iOptron GEM45G, Pegasus Falcon rotator
Image scale 2.54 arcsec/pixel
Baader  L R G B  filters
CCD temp -15C
  L- 26 x 10m  Red- 9 x 10m  Green - 9 x 10m  Blue- 9 x 10m   Bin 1x1  per panel
Planning & Acquisition
Image planning - Sequence Generator Pro Mosaic Planning
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
CCDStack -  Calibration, Normalize, Alignment,  Deconvolution
Adobe PS -  LRGB combine, Color adjustments, Noise reduction, Sharpen, JPEG conversion
RC-Astro Star XTerminator


    The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way. It is one of the most distant permanent objects that can be viewed with the naked eye.

  The galaxy is the smallest spiral galaxy in the Local Group (although the smaller Large and Small Magellanic Clouds may have been spirals before their encounters with the Milky Way), and is believed to be a satellite of the Andromeda Galaxy or on its rebound into the latter due to their interactions, velocities, and proximity to one another in the night sky. It also has an H II nucleus.
The galaxy gets its name from the constellation Triangulum, where it can be spotted.

  It is sometimes informally referred to as the "Pinwheel Galaxy" by some astronomy references,in some computerized telescope software, and in some public outreach websites. However, the SIMBAD Astronomical Database, a professional database, collates formal designations for astronomical objects and indicates that Pinwheel Galaxy refers to Messier 101, which several amateur astronomy resources including public outreach websites identify by that name, and that is within the bounds of Ursa Major.