This is a combination of about 4 hours from November 2023 and another (almost) 2 hours from November 2024. Good thing I saved all my original files and calibration frames!
Acquisition:
Bortle 7 skies Nikon D5600 camera (unmodified) ISO 200 Astro-Tech AT102ED refractor, 714mm focal length, f/7 HoTech 2" SCA field flattener (1X) iOptron CEM26 mount 30s x 707 frames (5h 53m)
Processing:
Siril 1.2.4:
Crop to 4800x3600px BQ Octantis' technique of white balance, background subtraction, and histogram conditioning StarNet star desaturation GraXpert denoising StarNet: - separation into stars and background - background: modified arcsinh stretches (4x), generalized hyperbolic stretch, black point, saturation - stars: synthetic blue (B=2*G-R), modified arcsinh stretches (4x), saturation - stars/bg recombined RGB alignment Background extraction
SIMPLE = T / file does conform to FITS standard
BITPIX = -32 / number of bits per data pixel
NAXIS = 3 / number of data axes
NAXIS1 = 4800 / length of data axis 1
NAXIS2 = 3600 / length of data axis 2
NAXIS3 = 3 / length of data axis 3
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
MIPS-FHI= 1 / Upper visualization cutoff
MIPS-FLO= 0 / Lower visualization cutoff
BZERO = 0 / offset data range to that of unsigned short
BSCALE = 1 / default scaling factor
DATE = '2025-03-06T14:01:01' / UTC date that FITS file was created
DATE-OBS= '2023-10-16T23:42:46' / YYYY-MM-DDThh:mm:ss observation start, UT
INSTRUME= 'Nikon D5600' / instrument name
OBSERVER= ' ' / observer name
TELESCOP= ' ' / telescope used to acquire this image
ROWORDER= 'BOTTOM-UP' / Order of the rows in image array
XPIXSZ = 3.92 / X pixel size microns
YPIXSZ = 3.92 / Y pixel size microns
XBINNING= 1 / Camera binning mode
YBINNING= 1 / Camera binning mode
FOCALLEN= 1082.03 / Camera focal length
CCD-TEMP= 0 / CCD temp in C
SET-TEMP= 0 / Temperature setting in C
EXPTIME = 29.9 / Exposure time [s]
STACKCNT= 19089 / Stack frames
LIVETIME= 570761 / Exposure time after deadtime correction
EXPSTART= 2.46023e+06 / Exposure start time (standard Julian date)
EXPEND = 2.46062e+06 / Exposure end time (standard Julian date)
FILTER = 'mixed ' / Active filter name
ISOSPEED= 200 / ISO camera setting
HISTORY RGB alignment (PSF)
HISTORY Background extraction (Correction: Subtraction)
END
File Name
gallery_361082_16772_9313497.jpg
Unix Timestamp
1741281447
Original File Size
11546453
File Type
2
Mime Type
image/jpeg
Sections Found
ANY_TAG, IFD0, COMMENT, EXIF
HTML Sizes
width="4800" height="3600"
Image Height
3600
Image Width
4800
Color
TRUE
Byte Order Motorola
FALSE
Image Description
SIMPLE = T / file does conform to FITS standard
BITPIX = -32 / number of bits per data pixel
NAXIS = 3 / number of data axes
NAXIS1 = 4800 / length of data axis 1
NAXIS2 = 3600 / length of data axis 2
NAXIS3 = 3 / length of data axis 3
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
MIPS-FHI= 1 / Upper visualization cutoff
MIPS-FLO= 0 / Lower visualization cutoff
BZERO = 0 / offset data range to that of unsigned short
BSCALE = 1 / default scaling factor
DATE = '2025-03-06T14:01:01' / UTC date that FITS file was created
DATE-OBS= '2023-10-16T23:42:46' / YYYY-MM-DDThh:mm:ss observation start, UT
INSTRUME= 'Nikon D5600' / instrument name
OBSERVER= ' ' / observer name
TELESCOP= ' ' / telescope used to acquire this image
ROWORDER= 'BOTTOM-UP' / Order of the rows in image array
XPIXSZ = 3.92 / X pixel size microns
YPIXSZ = 3.92 / Y pixel size microns
XBINNING= 1 / Camera binning mode
YBINNING= 1 / Camera binning mode
FOCALLEN= 1082.03 / Camera focal length
CCD-TEMP= 0 / CCD temp in C
SET-TEMP= 0 / Temperature setting in C
EXPTIME = 29.9 / Exposure time [s]
STACKCNT= 19089 / Stack frames
LIVETIME= 570761 / Exposure time after deadtime correction
EXPSTART= 2.46023e+06 / Exposure start time (standard Julian date)
EXPEND = 2.46062e+06 / Exposure end time (standard Julian date)
FILTER = 'mixed ' / Active filter name
ISOSPEED= 200 / ISO camera setting
HISTORY RGB alignment (PSF)
HISTORY Background extraction (Correction: Subtraction)
END
Orientation
The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side
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