Sunday, February 21, 2021

NGC-2903: It's Galaxy Season

 This photo pictures NGC-2903, and also NGC-2916. The former is much larger in apparent field of view, at 30.4 million light years away. The latter is very small and faint, and if I'm converting redshift to MLY correctly, it's just over 200 million light years distant. 



 

 

Down and to the right of the smaller of the two, you can see a third galaxy I haven't been able to find any information on (though it's surely categorized somewhere). In fact, close examination of a wider crop shows at least half a dozen other tiny faint galaxies. 

That's promising, because this photo represents only 30 light exposures at 150-seconds each, for a total integration time of only 1.25 hours. The scope is similarly modest, with just 80mm of aperture at a 447mm effective focal length. 

Here's a closer crop of the same data, processed slightly differently: 


  
 
 The biggest technical addition these photos represent is guiding, as well as tracking via software rather than using the SynScan hand controller that came with the AZ/EQ6-R Pro. I'm currently using INDI/Ekos via Kstars, which is free and open source, and therefore has good linux support. The guidescope is a basic 50mm William Optics scope with a ZWO-ASI 120mm Mini guide camera.

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