Dan_Paris Posted February 15 Share Posted February 15 (edited) Hi, Monday night the sky was hazy but the seeing conditions were really good. On the stacked luminance the median FWHM is 1.76". The best luminance frames have an median FWHM of 2,1 pix, namely 1.4" or 5µm. I think I never had such results before in broadband. NGC 3184 is a beautiful face-on spiral galaxy in Ursa Major, about 40 millions l.y. from us. It is not very contrasty so difficult to bring out of the sky background, especially in these conditions (Bortle 7/8, haze, quarter moon) so I pushed the integration time to six hours for the luminance. Here's a slightly cropped FOV, with also the little NGC 3179 galaxy and many more in the background (right-click for full resolution): And a tighter crop on the galaxy: Finally the annotated luminance, with many PGC galaxies and quasar labelled by their redshift (up to z=3.33 !). Clear skies, Dan Technical details 200/800 custom Newtonian astrograph with Romano Zen optics and carbon fiber tube AP900 CP4 mount on Losmandy HD tripod ASI183mm (0.66"/pix) TS 2.5" Riccardi-Wynne corrector ZWO LRGB filters Guiding : ZWO OAG + ASI120mm mini + AsiairV1 Luminance : 360 *60sec Chrominance : 30*60sec for each R, V and B filter Conditions : Bortle 7/8 skies in Paris' suburbs (20km from the Eiffel tower), very good seeing (1.76" FWHM), quarter moon, low transparency Processing with Pixinsight Edited February 15 by Dan_Paris 23 Link to comment Share on other sites More sharing options...
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