BINX and BINY values are not in FITS Header

[Dekelver Pieter-Jan]

Dear,

I came to the conclusion that there are no BINX and BINY values inside my FITS images. The fits header options boxes BINX and BINY are checked. FITS and FITS_1D

Example FITS Header of a 1s 2x2 BIN image :

What can be the solution? Thank you.

01 : SIMPLE = T /FITS header
02 : BITPIX = -32 /No.Bits per pixel
03 : NAXIS = 2 /No.dimensions
04 : NAXIS1 = 1092 /Length X axis
05 : NAXIS2 = 736 /Length Y axis
06 : DATE = '2024-09-21T08:34:19.331000' /Date of FITS file creation
07 : SWCREATE= 'PRISM, Version 11.4.22.39, 2024-08-15' /Software Name and version
08 : ORIGIN = 'Observatory Gromme ' /Origin place of FITS image
09 : OBSERVER= 'Pieter-Jan Dekelver' /Observer name
10 : SITELAT = '+51:01:57:99 ' /Latitude observatory
11 : SITELONG= '+05:36:02:00 ' /Longitude observatory
12 : DATE-OBS= '2024-09-21T08:34:17.212800' /UT date of Observation
13 : UT = '08:34:17.21 ' /UT begining of observation
14 : EXPOSURE= 1.00000 /Exposure time seconds
15 : CDELTM1 = 0.013600000000 /Size of a pixel (x) in mm
16 : XPIXSZ = 13.6 /X Binned pixel size as microns
17 : CDELTM2 = 0.013600000000 /Size of a pixel (y) in mm
18 : YPIXSZ = 13.6 /X Binned pixel size as microns
19 : INSTRUME= 'ASCOM_flipro0:ML0300316' /Camera which created data
20 : CVF = 5.000 /Conversion factor (e-/adu)
21 : READOUTT= 0.80 /Image readout time (sec)
22 : X1 = 1 /X1 image windowing
23 : Y1 = 1 /Y1 image windowing
24 : X2 = 2184 /X2 image windowing
25 : Y2 = 1472 /Y2 image windowing
26 : COMPRESS= 0 /Number of compression
27 : TELESCOP= '0.30-m f 4 Newtonian reflector' /Telescope
28 : FOCAL = 1267.0 /Focal length in mm
29 : DIAMETER= 300.0 /Diameter in mm
30 : CDELT1 = 0.000307506946 /ScaleX in deg/pix
31 : CDELT2 = 0.000307506946 /ScaleY in deg/pix
32 : DATAMAX = 5303.00 /Maximum data value
33 : DATAMIN = 4089.00 /Minimum data value
34 : CCD-TEMP= 20.1 /CCD temperature as Celsius degrees
35 : FOCUSPOS= 0.000 /Focuser position as mm
36 : FOCUSTMP= 0.0 /Focuser temperature as Celsius degrees
37 : BITCAMPX= 16 /Native camera dynamic in bits per pixel
38 : STACKNB = 1 /Amount of stacked images
39 : STARCNT = 0 /Amount of extracted stars
40 : GAIN_ELE= 0 /Camera electronic gain (arbitrary units)
41 : OFFSET_E= 0 /Camera electronic offset (arbitrary units)
42 : TEMPEXT = 0.0 /External temperature, unit is degrees C
43 : PRESSURE= 0.0 /Atm. Pressure, unit is Hpa
44 : DEWPOINT= 0.0 /Dewpoint temperature, unit is degrees C
45 : HUMIDITY= 0.0 /Relative humidity, unit is percent
46 : WINSPEED= 0.0 /Wind speed, unit is km/h
47 : WINDIR = 0.0 /Wind direction, North 0deg, East 90d
48 : IMGTYPE = 'STD_IMAGE ' /Image type, like flat, bias or dark
49 : BAYERIND= 0 /Bayer color Index
50 : COMMENT Mount: 10Micron GM2000 HPS G.E.M., QCI Control System. F.W.V.: 3.0.8
51 : HISTORY none
52 : END

[Dekelver Pieter-Jan]

Dear All,

Also: when i manual enter BINX and BINY headers inside the fits image, the values are not stored when for instance the images are subtracked with masters.
So i have to enter again BINX and BINY values inside these calibrated images.

Is there an update on this availeble? Of what is the problem?

Thank you very much.

[Cyril Cavadore]

I'll check that ...

[Cyril Cavadore]

Indeed the final explanation

If you check this box below BINX and BINY will not be in the FITS header

If you have 10µm pixel size and bin 2x2 this will be saved this way
1. BINX and BINY will not be in the FITS header
2. Fits will contain

Code : Tout sélectionner

XPIXELSZ=                20.00 /X pixel size microns    
CDELTM1 =       0.020000000000 /Size of a pixel (x) in mm    
XPIXSZ  =                 20.0 /X Binned pixel size as microns    

Same for Y pixel size with YPIXELSZ,CDELTM2,YPIXSZ

If the option is uncheck ->

Code : Tout sélectionner

14 : XPIXELSZ=                10.00 /X pixel size microns                            
15 : CDELTM1 =       0.010000000000 /Size of a pixel (x) in mm                       
16 : XPIXSZ  =                 20.0 /X Binned pixel size as microns                  
17 : YPIXELSZ=                10.00 /Y pixel size microns                            
18 : CDELTM2 =       0.010000000000 /Size of a pixel (y) in mm                       
19 : YPIXSZ  =                 20.0 /X Binned pixel size as microns                  
20 : BINX    =                    2 /X binning                                       
21 : BINY    =                    2 /Y binning                         

We are going to fall into the FITS nightmare, that has no stric definitions of XPIXELSZ,XPIXSZ and BINX
Unless someone proves me the contrary.

[Dekelver Pieter-Jan]

Thank you. I have looked over this option. Now it is working for me.