Prétraitement sous PI

par racdavnathewe Ven 17 Mai 2019 - 6:42

Bonjour à tous,

Faute de temps, je retraite de vieilles images.

Au niveau du prétraitement lors de la calibration des brutes avec PI, le coefficient k0 est fluctuant.

Sur certaines images (la majorité) il est au voisinage de 0.9, sur d'autres, il est de 0.1, 0.6 ...

Les brutes sont toutes de la même série et faite le même jour.

D’où cela peut-il venir?

J'en appelle à l'aide des spécialiste de PI?

En pièces-jointes, les paramètres de la calibration.

Voici u extrait des logs :
Writing output file: C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/1_CAL/Nouveau dossier/_1545NGC6960_L_600s_Bin1-1_-19°C_cal.fit
Dark scaling factors:
k0 = 0.951
Gaussian noise estimates:
s0 = 2.497e-03, n0 = 0.060 (MRS)
** Warning: Deprecated file format: FITS
46 FITS keywords embedded.
Writing FITS image: 32-bit floating point, 1 channel(s), 1391x1039 pixels: done

Calibrating target frame 13 of 13
Loading target frame:
C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/_1549NGC6960_L_600s_Bin1-1_-19°C.fit
Reading FITS image: 16-bit integers, 1 channel(s), 1391x1039 pixels: done
25 FITS keywords extracted.

Writing output file: C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/1_CAL/Nouveau dossier/_1546NGC6960_L_600s_Bin1-1_-19°C_cal.fit
Dark scaling factors:
k0 = 0.957
Gaussian noise estimates:
s0 = 2.542e-03, n0 = 0.064 (MRS)
** Warning: Deprecated file format: FITS
46 FITS keywords embedded.
Writing FITS image: 32-bit floating point, 1 channel(s), 1391x1039 pixels: done

* Waiting for running tasks to terminate ...

Writing output file: C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/1_CAL/Nouveau dossier/_1547NGC6960_L_600s_Bin1-1_-19°C_cal.fit
Dark scaling factors:
k0 = 1.777
Gaussian noise estimates:
s0 = 2.604e-03, n0 = 0.067 (MRS)
** Warning: Deprecated file format: FITS
46 FITS keywords embedded.
Writing FITS image: 32-bit floating point, 1 channel(s), 1391x1039 pixels: done

Writing output file: C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/1_CAL/Nouveau dossier/_1548NGC6960_L_600s_Bin1-1_-19°C_cal.fit
Dark scaling factors:
k0 = 0.917
Gaussian noise estimates:
s0 = 2.672e-03, n0 = 0.083 (MRS)
** Warning: Deprecated file format: FITS
46 FITS keywords embedded.
Writing FITS image: 32-bit floating point, 1 channel(s), 1391x1039 pixels: done

Writing output file: C:/Users/racda/Pictures/PHOTOS_A_TRAITER/ASTRONOMIE/NGC6960/BRUTES/L/LIGHTS/1_CAL/Nouveau dossier/_1549NGC6960_L_600s_Bin1-1_-19°C_cal.fit
Dark scaling factors:
k0 = 0.911
Gaussian noise estimates:
s0 = 2.766e-03, n0 = 0.077 (MRS)
** Warning: Deprecated file format: FITS
46 FITS keywords embedded.
Writing FITS image: 32-bit floating point, 1 channel(s), 1391x1039 pixels: done

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