6 replies to this topic

[Matt0011]

I took images of M97 using L, HA, and OIII filters. When I used Weighted Batch Preprocessing in PixInsight, my L images work, but the Ha and OIII images fail. 

 

I attached a screenshot of an OIII image that's failing, and here's its corresponding FITS file:

https://drive.google...iew?usp=sharing

 

I tried integrating with just the lights, and also with darks and flats. Ha and OIII failed no matter what I did.

 

Images were taken using a Celestron NexStar 8SE scope and ZWO ASI2600MM camera. 60s exposures, 100 gain, 30 offset.

 

What am I doing wrong here?

[2024-04-17 19:55:55] * Applying error policy: Continue on error.
[2024-04-17 19:55:56] * Loading target file: C:/Astrophotography/DSO/M97/LIGHT/2024-04-08_02-35-36_OIII_-5.00_60.00s_0088.fits
[2024-04-17 19:55:56] Reading FITS image: 16-bit integers, 1 channel(s), 6248x4176 pixels: done
[2024-04-17 19:55:56] 45 FITS keywords extracted
[2024-04-17 19:55:56] Structure map:
[2024-04-17 19:55:56] Local maxima map: done
[2024-04-17 19:55:56] Detecting stars: done
[2024-04-17 19:55:56] 8 stars found.
[2024-04-17 19:55:56] Minimum star size: 3 px
[2024-04-17 19:55:56] * Computing global linear transformation.
[2024-04-17 19:55:56] Matching stars: done
[2024-04-17 19:55:56] ** 0 star pair matches found - need at least 3 matched stars.
[2024-04-17 19:55:56] * Previous attempt failed - this is try #2
[2024-04-17 19:55:56] * Reference image: limiting to 8 brightest stars.
[2024-04-17 19:55:56] Matching stars: done
[2024-04-17 19:55:56] ** 0 star pair matches found - need at least 3 matched stars.
[2024-04-17 19:55:56]
[2024-04-17 19:55:56] *** Error:
[2024-04-17 19:55:56] *** Error: Unable to find an initial linear transformation.

Attached Thumbnails

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[DanMiller]

I have had failed inteigration.  What I can sugest is that you run the intigration manually, and see if it fails there.  What you do is bringup intigration from the process menue.  Then when you click on the Add Files.  Navigate to your Registration folder, sub folder of your primaryt WBPP batch folder.  I never have done OII and things like that so I don't know if there is a sub folder for that.  But pull in the correct folder files and try it that way.

 

I also have noticed that if there are work files from other WBPP runs laying around, that has caused me issues.  You can determine if that is the case by looking Clicking on Edit -> Global Preferences -> Directory and Networks.  Clear out all of the temp files in any directories listed there.  Then rerun WBPP if the above sugestion doesn't work.

 

I am sorry I am not more help if this doesn't work.  You need to registration folders though for the first part to manually rerun intigration.  And if you have them, than you won't have to rerun WBPP.

 

Dan

Edited by DanMiller, 19 April 2024 - 03:47 PM.

[sheepofblue]

So a couple of things when I have unexpected failures.  Did the image solve?  Manually pick one that you know plate solves.  Also be sure to clear the cache.  Without more data the only other thing is reset it all and restart pixinsight.  OIII gives mine fits sometimes so far also

[bobzeq25]

So a couple of things when I have unexpected failures.  Did the image solve?  Manually pick one that you know plate solves.  Also be sure to clear the cache.  Without more data the only other thing is reset it all and restart pixinsight.  OIII gives mine fits sometimes so far also

Note that PI is more sensitive to bad data when it comes to platesolving, than it is to bad data when it comes to integration.  Data that platesolves will integrate, but the reverse is not true.

 

I trust everyone notices that the reason integration failed was that there were not enough star matches to integrate the subs.

Edited by bobzeq25, 19 April 2024 - 05:04 PM.

[KTAZ]

Note that PI is more sensitive to bad data when it comes to platesolving, than it is to bad data when it comes to integration.  Data that platesolves will integrate, but the reverse is not true.

 

I trust everyone notices that the reason integration failed was that there were not enough star matches to integrate the subs.

I was about to say the same thing...narrowband subs require significantly more exposure time.

 

And I never trust WBPP for stacking beyond darks and flats; more often than not I get inconsistant results.

[idclimber]

The problem is your stars look like this:

 

 

My guess is tracking and poor collimation and/or focus. All the stars in the field look like this. Fix this and extend your exposures to 300" on  the narrowband fliers and you will have a lot better luck integrating these. 

Edited by idclimber, 19 April 2024 - 06:40 PM.

[KTAZ]

Those "star-trek badge" star shapes are caused by coma at the edges of a typical SCT field. Shouldn't see them in the center.