Ha and Oiii Analysi...
 
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Ha and Oiii Analysis and registration fails.  

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(@sunfish)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 5
October 18, 2020 03:30  

I have 70 Ha and Oiii images with only a few hundred stars which stack fine in DSS but can not be stacked in APP. I have tried various settings but it seems very much like trial and error so I am back to using DSS  and importing the stacks which seems like it may not be getting the most out of the APP subscription.


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2653
October 20, 2020 11:09  

Can you post a screenshot of a sub here? APP is very robust these days with detecting stars.


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(@sunfish)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 5
October 20, 2020 12:23  

@vincent-mod

Thanks for the reply. Do mean a stretched jpg of a sub?

A 3min Ha sub in mono looks pretty black at low gain. Here is a stretched jpg of a 5min sub and the unstretched version

5mn ha helix st
3mn ha helix

 


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(@sunfish)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 5
October 20, 2020 12:33  

I did finally manage to get some HOO stacked by trial and error however it was very difficult and unpredictable compared to DSS. Also the RGB component stacked as a different image size although I used the same reference file.

Helix APP HOO2 70x3min

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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2653
October 20, 2020 12:49  

Yes well, looking at the stretched sub those are still very dark. I'm wondering if, after calibration, a problem arises. There should at least be some noise visible in the stretched sub, what gain and offset (assuming you use a astro-cam) did you use? APP is very sophisticated regarding its algorithms and usually is able to register very difficult datasets (which can be seen by the relative ease of creating properly aligned and corrected mosaics for example).


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(@sunfish)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 5
October 20, 2020 13:06  

@vincent-mod

These are pretty standard Astro images at 3min gain 75 with an asi 1600 mono and some 5min at 0 gain. DSS has no problem stacking. Here is a version combining the separate unaltered DSS RGBHO stacks in APP

Helix RGBHOO DSS APP 84x3

 

 


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2653
October 20, 2020 13:09  

Interesting these gave so many problems I do have to say, as there indeed are more than enough stars. Usually when this really fails, a problem is seen in the calibration. But it looks like you solved that part at least right? If not, we'd be very interested in the data for us to see if this still has something that might throw APP off (which almost never happens anymore). An upcoming version of APP will even register on just a couple of stars so if that doesn't work, something else is up.


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(@sunfish)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 5
October 20, 2020 13:14  

@vincent-mod

The subs calibrate and the DSS stacks calibrate but the subs will not register. What settings should I be using for these subs?


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2653
October 20, 2020 13:19  

Would you be able to send me a few of the subs for me to check out? That will give me the best idea for what may be up and if I can see what it is, to tell you exactly why.Best would be to have some uncalibrated raw subs and master calibration files.

Please go to https://upload.astropixelprocessor.com and use upload1 as username and upload1 as password.

Create a directory named “sunfish-registrationfailure” and upload in there. Thank you!


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(@vincent-mod)
Universe Admin
Joined: 3 years ago
Posts: 2653
October 24, 2020 11:49  

I see you uploaded them, sorry as I'm very busy it's better to use the name like I mentioned above as I can find easier to whom the data belongs. I'll work on it later today.


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