Combination of Bortle 2-3 and 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 483 frames (4h)
Processing:
Siril 1.2.4:
Crop to 4800x3600px
Photometric color calibration
GraXpert denoise
Star desaturation
StarNet background:
Modified arcsinh stretch (4x)
Black point
Generalized hyperbolic stretch
Background extraction
Export as .tif
RawTherapee 5.9 saturation, L*a*b chrominance/luminance noise reduction
Import .tif as .fit
StarNet stars:
Synthetic blue (B=2*G-R)
Modified arcsinh stretch (4x)
Saturation
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= 0.964981 / Upper visualization cutoff
MIPS-FLO= 0.000640879 / Lower visualization cutoff
BZERO = 0 / offset data range to that of unsigned short
BSCALE = 1 / default scaling factor
DATE = '2024-10-04T11:25:17' / UTC date that FITS file was created
DATE-OBS= '2023-09-14T23:55:11' / YYYY-MM-DDThh:mm:ss observation start, UT
INSTRUME= ' ' / instrument name
OBSERVER= ' ' / observer name
TELESCOP= ' ' / telescope used to acquire this image
ROWORDER= 'TOP-DOWN' / 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= 709.913 / Camera focal length
CCD-TEMP= 0 / CCD temp in C
SET-TEMP= 0 / Temperature setting in C
EXPTIME = 14.95 / Exposure time [s]
STACKCNT= 966 / Stack frames
LIVETIME= 28883.4 / Exposure time after deadtime correction
EXPEND = 2.46059e+06 / Exposure end time (standard Julian date)
FILTER = 'mixed ' / Active filter name
CTYPE1 = 'RA---TAN' / Coordinate type for the first axis
CTYPE2 = 'DEC--TAN' / Coordinate type for the second axis
CUNIT1 = 'deg ' / Unit of coordinates
CUNIT2 = 'deg ' / Unit of coordinates
EQUINOX = 2000 / Equatorial equinox
OBJCTRA = '22 36 32.339' / Image center Right Ascension (hms)
OBJCTDEC= '+34 13 48.371' / Image center Declination (dms)
RA = 339.135 / Image center Right Ascension (deg)
DEC = 34.2301 / Image center Declination (deg)
CRPIX1 = 2400 / Axis1 reference pixel
CRPIX2 = 1800 / Axis2 reference pixel
CRVAL1 = 339.135 / Axis1 reference value (deg)
CRVAL2 = 34.2301 / Axis2 reference value (deg)
CDELT1 = -0.000316416 / X pixel size (deg)
CDELT2 = 0.000316336 / Y pixel size (deg)
PC1_1 = 0.0154387 / Linear transformation matrix (1, 1)
PC1_2 = 0.999881 / Linear transformation matrix (1, 2)
PC2_1 = -0.999883 / Linear transformation matrix (2, 1)
PC2_2 = 0.015324 / Linear transformation matrix (2, 2)
PLTSOLVD= T / Siril internal solve
HISTORY RGB alignment (PSF)
END
File Name
gallery_361082_16772_391005.jpg
Unix Timestamp
1728065068
Original File Size
23666768
File Type
2
Mime Type
image/jpeg
Sections Found
ANY_TAG, IFD0, EXIF
HTML Sizes
width="4800" height="3600"
Image Height
3600
Image Width
4800
Color
TRUE
Byte Order Motorola
TRUE
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= 0.964981 / Upper visualization cutoff
MIPS-FLO= 0.000640879 / Lower visualization cutoff
BZERO = 0 / offset data range to that of unsigned short
BSCALE = 1 / default scaling factor
DATE = '2024-10-04T11:25:17' / UTC date that FITS file was created
DATE-OBS= '2023-09-14T23:55:11' / YYYY-MM-DDThh:mm:ss observation start, UT
INSTRUME= ' ' / instrument name
OBSERVER= ' ' / observer name
TELESCOP= ' ' / telescope used to acquire this image
ROWORDER= 'TOP-DOWN' / 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= 709.913 / Camera focal length
CCD-TEMP= 0 / CCD temp in C
SET-TEMP= 0 / Temperature setting in C
EXPTIME = 14.95 / Exposure time [s]
STACKCNT= 966 / Stack frames
LIVETIME= 28883.4 / Exposure time after deadtime correction
EXPEND = 2.46059e+06 / Exposure end time (standard Julian date)
FILTER = 'mixed ' / Active filter name
CTYPE1 = 'RA---TAN' / Coordinate type for the first axis
CTYPE2 = 'DEC--TAN' / Coordinate type for the second axis
CUNIT1 = 'deg ' / Unit of coordinates
CUNIT2 = 'deg ' / Unit of coordinates
EQUINOX = 2000 / Equatorial equinox
OBJCTRA = '22 36 32.339' / Image center Right Ascension (hms)
OBJCTDEC= '+34 13 48.371' / Image center Declination (dms)
RA = 339.135 / Image center Right Ascension (deg)
DEC = 34.2301 / Image center Declination (deg)
CRPIX1 = 2400 / Axis1 reference pixel
CRPIX2 = 1800 / Axis2 reference pixel
CRVAL1 = 339.135 / Axis1 reference value (deg)
CRVAL2 = 34.2301 / Axis2 reference value (deg)
CDELT1 = -0.000316416 / X pixel size (deg)
CDELT2 = 0.000316336 / Y pixel size (deg)
PC1_1 = 0.0154387 / Linear transformation matrix (1, 1)
PC1_2 = 0.999881 / Linear transformation matrix (1, 2)
PC2_1 = -0.999883 / Linear transformation matrix (2, 1)
PC2_2 = 0.015324 / Linear transformation matrix (2, 2)
PLTSOLVD= T / Siril internal solve
HISTORY RGB alignment (PSF)
END
Orientation
The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side
1
