NGC 2903

Click on the image to display it full screen

Observation place
New Mexico


TelescopePlanewave 431mm – 17″, 1940mm FL, f/4,5 with focal reducer
MountPlanewave Ascension 200HR (FLI)
Imaging cameraMicroline PL6303E (FLI) - regulated at -35o Celsius
Image typeL (RGB) (Vs for synghetic green)
ExhibitionLuminance (9 x 10 'bin 1 × 1), R and B (8 x 3' bin 2 × 2 each) 
PretreatmentMaxim DL
TreatmentPhotoshop and PixInsight
Specific treatmentCreate a synthetic green image

Object description

Object typeBarred spiral galaxy
Visual magnitude9,7
Distance25 million light years
Diameter50000 light years
Dimension seen from Earth12,6 x 6 arc minutes 
NGC2903 is a barred spiral galaxy visible in the spring sky. Its distance is about 25 million light years from Earth. It contains the diffuse nebula NGC2905 which is located in one of the arms of the galaxy. The galaxy is about half of our Milky Way's diameter.  

In a site with little light pollution, NGC2903 is visible through binoculars and small telescopes. We then see it as a stain. It takes a telescope with a diameter of 10 inches or more to start solving the galaxy.  

In my image, which solves NGC2903 very well, we can appreciate the great beauty of this galaxy which is presented in blue tones. We can also see four other galaxies presented in the following annotation (made with the PixInsight software using my image). See the blue annotations PGC… in the following link:

It is always impressive to see so many galaxies in a field of view of about the diameter of the full moon (30 'of arc). Each of these galaxies containing billions of stars!  
Richard Beauregard
Sky Astro - CCD
My impression "We cannot be alone in this gigantic universe"