NGC 2403

[tomato]

This is 188 x 2 mins taken with the dual Esprit 150/IMX571c rig over two very contrasting sessions. The first 3 hrs were on a night of stunning clarity but terrible seeing, FWHM figures of >4.1 being recorded. The second was much improved seeing (~3.1 FWHM) but the session was curtailed by advancing mist and fog.  I combined the data sets anyway, calibrated and stacked in APP, gradient removal in APP then StarXterminator in PI, Histogram and Curves transformation, recombine with PixelMath then NoiseXterminator applied, 0.85 noise reduction, 0.35 detail enhancement. Finished off in Affinity Photo. As usual some distant tiny galaxies coming through, I am intrigued by the reddish galaxy in the lower left PGC 267462, but apart from some general position and magnitude parameters, I couldn't find a value for the red shift.

Thanks for looking.

 

 

Edited November 29, 2022 by tomato
Correct image attached

[tomato]

Here is another go, using the new Spectrophotometric Colour Calibration tool in Pixinsight (just needed to download the 62 Gig Gaia stars database, gulp!). I think the background is better, but not sure about the galaxy...

 

[wimvb]

On 29/11/2022 at 23:20, tomato said:

I am intrigued by the reddish galaxy in the lower left PGC 267462, but apart from some general position and magnitude parameters, I couldn't find a value for the red shift.

Very nice image, despite the conditions. This target is definitely worth revisiting under more favourable conditions. Especially if you also collect Ha.

Here's data from the NASA database on the small red galaxy

http://ned.ipac.caltech.edu/byname?objname=LEDA+2674762&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1

Edited December 3, 2022 by wimvb