Calibration issues
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Hi!
I use ASTAP to calibrate my images of variable stars, taken with various photometric filters. Lately (like today), I'm having some issues. At times (but only at times) images seem not well calibrated, and I notice that some are DFB, others only DF. I can not find anything systematic in this. I've created master flats with flat-darks, it is the master flats I use, no flat-darks entered when I calibrate the lights.
I am not sure how I can explore or describe this further. I'm doing this on an Ubuntu system - is there a log file located some place...? I could share a dropbox folder with my calibration frames and light frames - would that be a way?
Magnus
It is possible to write to log to file by check marking "write log file" (bottom right of stack menu) or just simple copy past the log into an forum posting.
If flat darks/bias are ignored it must have a valid reason. This problem should be repeatable. If you can share a (sub)set where it happens I can have a look. It must be something simple like incompatible dimensions width x height
Han
Hi! Yes, the checkbox i checked but I cant find the log-file... where should I look on a linux system?
Strangely, now it suddenly worked out. I'll see if I can identify a set that does not work.
Magnus
Hi!
So here's a question. I'm calibrating a bunch of files with 3 different filters. The outlook all look good. They are all taken with 60 sec exposure. But the ones with green filter is marked DF in the list, the rest DFB. Here's the output:
07:32:17 Loading master dark file /home/magnus/astro_NAS/calibration/QHY268m/darks_mode1/mode1/bin4_Gain20_Offfset20/master_dark_50x60s_at_-10C_2023-06-05.fit
07:32:18 Calibrating file: 1-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-24-15_001.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:18 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-24-15_001_cal.fit
07:32:18 Calibrating file: 2-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-25-20_002.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:18 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-25-20_002_cal.fit
07:32:19 Calibrating file: 3-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-26-25_003.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:19 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_V_60_secs_2023-09-04T22-26-25_003_cal.fit
07:32:19 Loading master flat file /home/magnus/astro_NAS/calibration/QHY268m/flats/2023-08-10_C11_Skyflats_CBVRI_bin4/master_flat_corrected_with_flat_darks_R_1.00sec_10xF_1xFD_2023-08-10.fit
07:32:20 Calibrating file: 4-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-27-32_001.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:20 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-27-32_001_cal.fit
07:32:20 Calibrating file: 5-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-28-37_002.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:20 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-28-37_002_cal.fit
07:32:21 Calibrating file: 6-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-29-41_003.fits" to average. Using 50 darks, 10 flats, 1 flat-darks
07:32:21 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_R_60_secs_2023-09-04T22-29-41_003_cal.fit
07:32:21 Loading master flat file /home/magnus/astro_NAS/calibration/QHY268m/flats/2023-08-10_C11_Skyflats_CBVRI_bin4/master_flat_corrected_with_flat_darks_I_2.00sec_9xF_1xFD_2023-08-10.fit
07:32:22 Calibrating file: 7-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-30-48_001.fits" to average. Using 50 darks, 9 flats, 1 flat-darks
07:32:22 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-30-48_001_cal.fit
07:32:22 Calibrating file: 8-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-31-53_002.fits" to average. Using 50 darks, 9 flats, 1 flat-darks
07:32:23 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-31-53_002_cal.fit
07:32:23 Calibrating file: 9-8 "/home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-32-57_003.fits" to average. Using 50 darks, 9 flats, 1 flat-darks
07:32:23 █ █ █ Saving calibrated file as /home/magnus/astro_NAS/VAR/2023/2023-09-04_C11/V0462_Cyg/V0462_Cyg_Light_I_60_secs_2023-09-04T22-32-57_003_cal.fit
07:32:23 Calibration of the individual files is complete. New files are posted in the results tab
07:32:23 Completed. Resulting files are available in tab Results and can be copied to the Blink, Photometry or Lights tab.
Any ideas why there is a difference btw the V-filters and the others?
Magnus
Hi Magnus,
The log indicates the V filter files are calibrated DFB so it makes no sense why they record only DF calibration. Can you share your 8 files including darks and flats to test and analyse it here in the the debugger?
Han
Hi!
You find the files here:
https://www.dropbox.com/scl/fo/2x9cppdk500lt4azanzj2/h?rlkey=cvk9y1mle4w3jfokt93wzw9ve&dl=0
Does that work?
Magnus
I have now the lights. Can you also share the darks and flats used?
I suspect the Flat for V is incomplete, so without flat-darks.
Han
Hi! Darks and flats are in the same folder now.
Magnus