Let’s chase the Bubble
I needed some better Heart Nebula lights for the S2O3 part, just in case. But it was too low on the horizon, so my guiding system was going nuts. I decided to target the Bubble Nebula.
I went to my usual spot, crossing a peaceful deer. I noticed something different … the field used to be a cows place, but the barriers weren’t there anymore. So the path to the woods was clear for any beast coming from there. I was scared last time by this boar running straight to me. I decided to change spot. There is another one the way up, and woods are not that close. Only issue is this bus line using this very small road (really joining a village with 12 people to another village with 50 people … ). And this bus is careful so its road lights are the worst for light pollution on my shots. Going there, I cross the deer again, and then again … he probably was annoyed, poor fellow … sorry deer, I’ll stop there so I will not bother you anymore.
I tried to get these better lights shots for IC1805, but I gave up around midnight. I faced again the Meridian Flip (earlier than the session before), and guiding was a nightmare while I was trying long exposure of 180 seconds (RMS around 3”-4”). It was also a bit windy … It is time to get over the Heart Nebula, this project is definitively closed.
I slew then to the Bubble Nebula also named NGC7635 from the New General Catalog. Guiding was a bit better as this object is higher in the sky. I decided to force the calibration of the guiding system and once the object well focused (automatically by N.I.N.A.) I started to shoot.
I wanted the SHO version, and I used my two dual-band filters. 50 shots of 60 seconds with the filter HO and 50 shots of 60 seconds with the filter SO. I also wanted to try the LowNoise Readout feature from my new camera, and then set the gain to 0.
Master HaO3
Master S2O3
Once back to my place (3H40AM … ), I brought the pictures from the mini-computer to my laptop and started to work on these pictures
I got the set of lights stacked from each filter. You can see above a master pile HydrogenalphaOxygen3 and the master pile Sulfure2Oxygen3
That’s the second time I notice this vignetting appearing the S2O3 filter lights … that’s very weird. I need to figure if it is a bad set of filter or something I miss. The HaO3 master is just beautiful to me. Though, I need to integrate them to get the SHO picture.
I got from my IC1805 experience, that I need to align the stars of the two masters to ensure good integration. Pixinsight is really cool, and using the processes already run on IC1805 I got a SHO picture (the one from the title).
I’m not that happy about the SO master, not enough data … does it mean I need to expose more time on this filter ? I guess I’ll have to try to figure out.
I feel the object is better without stars and it makes the bubble popping. This picture is dedicated to someone so just don’t share widely, there’s a copyright on it..
Exifs : Celestron C9’25 + Starizona Hyperstar + PegasusAstro Nyx-101 + PlayerOne Poseidon C Pro cooled at -10°C / Askar Duo Magic D1 filter 2” Halpha/OIII and D2 2” OIII/SII - Guiding System Askar FMA135 with PlayerOne Ceres C
50 lights 60 seconds each Gain 0 filter D1
50 lights 60 seconds each Gain 0 filter D2
Stacked with Siril - Post-Treatment with some tryouts on Pixinsight
