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Messier 1 (Crab Nebula)

Uploaded by EPinNC , Feb 04 2025 07:39 PM

Owner: EPinNC (View all images and albums)
Uploaded: Feb 04 2025 07:39 PM
Taken: 2024:12:30 23:24:08
Views: 72
Album: Tracked Telescope and Camera/Lens Images

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 361 frames (3h)

Processing:

Siril 1.2.4:

Crop to 3600x2700px
StarNet star desaturation
Photometric color calibration
StarNet:
- separation into stars and background
- background: background extraction, GraXpert denoise, modified arcsinh stretch, generalized hyperbolic stretch, histogram adjustment, saturation
- stars: Borodog's synthetic blue (B=2*G-R), modified arcsinh stretch, saturation

RawTherapee 5.11:

Luminance noise reduction

GIMP 2.10:

Luminance curve
Saturation
Temperature

Image META information

COMPUTED.UserCommentEncoding	UNDEFINED
COMPUTED.Copyright	Siril v1.2.4
IFD0.ICC_Profile
COMMENT.0	SIMPLE = T / file does conform to FITS standard BITPIX = -32 / number of bits per data pixel NAXIS = 3 / number of data axes NAXIS1 = 3600 / length of data axis 1 NAXIS2 = 2700 / 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 = '2025-02-05T00:20:07' / UTC date that FITS file was created DATE-OBS= '2024-12-30T23:24:08' / 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= 709.077 / Camera focal length CCD-TEMP= 0 / CCD temp in C SET-TEMP= 0 / Temperature setting in C EXPTIME = 29.9 / Exposure time [s] STACKCNT= 1083 / Stack frames LIVETIME= 32381.7 / Exposure time after deadtime correction EXPSTART= 2.46068e+06 / Exposure start time (standard Julian date) EXPEND = 2.46071e+06 / Exposure end time (standard Julian date) FILTER = 'mixed ' / Active filter name ISOSPEED= 200 / ISO camera setting 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 = '05 34 31.833' / Image center Right Ascension (hms) OBJCTDEC= '+22 01 3.666' / Image center Declination (dms) RA = 83.6326 / Image center Right Ascension (deg) DEC = 22.0177 / Image center Declination (deg) CRPIX1 = 1800 / Axis1 reference pixel CRPIX2 = 1350 / Axis2 reference pixel CRVAL1 = 83.6326 / Axis1 reference value (deg) CRVAL2 = 22.0177 / Axis2 reference value (deg) CDELT1 = -0.000316736 / X pixel size (deg) CDELT2 = 0.000316762 / Y pixel size (deg) PC1_1 = 0.999922 / Linear transformation matrix (1, 1) PC1_2 = 0.0124565 / Linear transformation matrix (1, 2) PC2_1 = -0.012571 / Linear transformation matrix (2, 1) PC2_2 = 0.999921 / Linear transformation matrix (2, 2) PLTSOLVD= T / Siril internal solve END
File Name	gallery_361082_16772_3098345.jpg
Unix Timestamp	1738715945
Original File Size	10847610
File Type	2
Mime Type	image/jpeg
Sections Found	ANY_TAG, IFD0, COMMENT, EXIF
HTML Sizes	width="3600" height="2700"
Image Height	2700
Image Width	3600
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 = 3600 / length of data axis 1 NAXIS2 = 2700 / 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 = '2025-02-05T00:20:07' / UTC date that FITS file was created DATE-OBS= '2024-12-30T23:24:08' / 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= 709.077 / Camera focal length CCD-TEMP= 0 / CCD temp in C SET-TEMP= 0 / Temperature setting in C EXPTIME = 29.9 / Exposure time [s] STACKCNT= 1083 / Stack frames LIVETIME= 32381.7 / Exposure time after deadtime correction EXPSTART= 2.46068e+06 / Exposure start time (standard Julian date) EXPEND = 2.46071e+06 / Exposure end time (standard Julian date) FILTER = 'mixed ' / Active filter name ISOSPEED= 200 / ISO camera setting 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 = '05 34 31.833' / Image center Right Ascension (hms) OBJCTDEC= '+22 01 3.666' / Image center Declination (dms) RA = 83.6326 / Image center Right Ascension (deg) DEC = 22.0177 / Image center Declination (deg) CRPIX1 = 1800 / Axis1 reference pixel CRPIX2 = 1350 / Axis2 reference pixel CRVAL1 = 83.6326 / Axis1 reference value (deg) CRVAL2 = 22.0177 / Axis2 reference value (deg) CDELT1 = -0.000316736 / X pixel size (deg) CDELT2 = 0.000316762 / Y pixel size (deg) PC1_1 = 0.999922 / Linear transformation matrix (1, 1) PC1_2 = 0.0124565 / Linear transformation matrix (1, 2) PC2_1 = -0.012571 / Linear transformation matrix (2, 1) PC2_2 = 0.999921 / Linear transformation matrix (2, 2) PLTSOLVD= T / Siril internal solve END
Orientation	The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side
X-Resolution	10748/91
Y-Resolution	10748/91
Resolution Unit	3
Software	GIMP 2.10.38
Date Taken	2024:12:30 23:24:08
Copyright	Siril v1.2.4
Exposure Time	0/1
F Number	0/10
ISO Speed Ratings	0
Exposure Bias Value	0/100
Focal Length	0/10

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Messier 1 (Crab Nebula)

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