ES127_29m0s_M17 (NGC 6618,Omega,Swan,Horseshoe Nebula)

SIMPLE = T / file does conform to FITS standard

BITPIX = 16 / number of bits per data pixel

NAXIS = 3 / number of data axes

NAXIS1 = 5609 / length of data axis 1

NAXIS2 = 3846 / 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

BZERO = 0. / Offset data range to that of unsigned short

BSCALE = 1. / Default scaling factor

PROGRAM = 'Siril 1.4.0-beta3' / Software that created this HDU

DATE = '2025-09-11T14:56:38' / UTC date that FITS file was created

DATE-OBS= '2025-09-11T01:24:47.985174' / YYYY-MM-DDThh🇲🇲ss observation start,

ROWORDER= 'TOP-DOWN' / Order of the rows in image array

EXPTIME = 1740. / [s] Exposure time duration

OBSERVER= 'DaveMartin' / Observer name

FILTER = 'L_Enhance' / Active filter name

FOCALLEN= 957.752 / [mm] Focal length

CENTALT = 28.4102777777778 / [deg] Altitude of telescope

CENTAZ = 211.461944444444 / [deg] Azimuth of telescope

XBINNING= 1 / Camera binning mode

YBINNING= 1 / Camera binning mode

XPIXSZ = 3.76 / [um] Pixel X axis size

YPIXSZ = 3.76 / [um] Pixel Y axis size

INSTRUME= 'ZWO ASI2600MC Pro' / Instrument name

CCD-TEMP= -10. / [degC] CCD temperature

SET-TEMP= -10. / [degC] CCD temperature setpoint

GAIN = 100 / Sensor gain

OFFSET = 12 / Sensor gain offset

CVF = 0.2636 / [e-/ADU] Electrons per A/D unit

FOCPOS = 19549 / [step] Focuser position

FOCTEMP = 17.5 / [degC] Focuser temperature

OBJECT = 'M17 (NGC 6618,Omega,Swan,Horseshoe Nebula)' / Name of the object of i

AIRMASS = 2.09318904147266 / Airmass at frame center (Gueymard 1993)

SITELAT = 39.3488888888889 / [deg] Observation site latitude

SITELONG= -78.8116666666667 / [deg] Observation site longitude

OBJCTRA = '18 20 46.744' / [H M S] Image center Right Ascension

OBJCTDEC= '-16 10 11.147' / [D M S] Image center Declination

RA = 275.194765291143 / [deg] Image center Right Ascension

DEC = -16.1697629615449 / [deg] Image center Declination

CTYPE1 = 'RA---TAN-SIP' / TAN (gnomic) projection + SIP distortions

CTYPE2 = 'DEC--TAN-SIP' / TAN (gnomic) projection + SIP distortions

CUNIT1 = 'deg ' / Unit of coordinates

CUNIT2 = 'deg ' / Unit of coordinates

EQUINOX = 2000. / Equatorial equinox

CRPIX1 = 2805. / Axis1 reference pixel

CRPIX2 = 1923.5 / Axis2 reference pixel

CRVAL1 = 275.194765291143 / [deg] Axis1 reference value

CRVAL2 = -16.1697629615449 / [deg] Axis2 reference value

LONPOLE = 180. / Native longitude of celestial pole

CDELT1 = -0.000224888425230204 / [deg] X pixel size

CDELT2 = 0.000224982118571145 / [deg] Y pixel size

PC1_1 = -0.352438328281194 / Linear transformation matrix (1, 1)

PC1_2 = -0.935835041424693 / Linear transformation matrix (1, 2)

PC2_1 = 0.935971808256997 / Linear transformation matrix (2, 1)

PC2_2 = -0.352074955298054 / Linear transformation matrix (2, 2)

A_ORDER = 3 / SIP polynomial degree, axis 1, pixel-to-sky

A_0_0 = 0.

A_1_0 = 0.

A_0_1 = 0.

A_2_0 = -2.48631852600035E-07

A_1_1 = -6.2382581520478E-08

A_0_2 = -1.03385772643892E-07

A_3_0 = -3.21309904725447E-10

A_2_1 = 1.21273463791468E-11

A_1_2 = -3.15710758511071E-10

A_0_3 = 2.97036971111385E-12

B_ORDER = 3 / SIP polynomial degree, axis 2, pixel-to-sky

B_0_0 = 0.

B_1_0 = 0.

B_0_1 = 0.

B_2_0 = -3.36573228505944E-08

B_1_1 = -1.28174087449613E-07

B_0_2 = -1.10067097532655E-07

B_3_0 = 4.57569104227693E-12

B_2_1 = -3.14455935262986E-10

B_1_2 = 1.0959542787778E-11

B_0_3 = -3.15196299628092E-10

AP_ORDER= 3 / SIP polynomial degree, axis 1, sky-to-pixel

AP_0_0 = -0.00387538504595189

AP_1_0 = -1.02148802987312E-05

AP_0_1 = 8.95195348212583E-07

AP_2_0 = 2.52293713200998E-07

AP_1_1 = 6.32535441223069E-08

AP_0_2 = 1.047013596386E-07

AP_3_0 = 3.25306475619976E-10

AP_2_1 = -1.24368036124335E-11

AP_1_2 = 3.20035747504514E-10

AP_0_3 = -3.17349798746077E-12

BP_ORDER= 3 / SIP polynomial degree, axis 2, sky-to-pixel

BP_0_0 = -0.00110194118209101

BP_1_0 = 7.42384306986938E-07

BP_0_1 = -7.18489317730331E-06

BP_2_0 = 3.41130954977524E-08

BP_1_1 = 1.29843957811852E-07

BP_0_2 = 1.11125435305567E-07

BP_3_0 = -4.68999123635695E-12

BP_2_1 = 3.18292309543107E-10

BP_1_2 = -1.1377819498899E-11

BP_0_3 = 3.18165043023885E-10

PLTSOLVD= T / Siril internal solver

HISTORY Crop (x=367, y=191, w=5609, h=3846)

HISTORY Plate Solve

HISTORY Background extraction (Correction: Subtraction)

HISTORY Photometric CC (algorithm: PCC)

HISTORY Photometric CC (algorithm: PCC)

HISTORY Photometric CC (algorithm: SPCC)

HISTORY StatStretch: m=0.20 l=False n=False c=False b=0.00

HISTORY StatStretch: m=0.20 l=True n=False c=False b=0.00

HISTORY StatStretch: m=0.20 l=True n=True c=True b=0.00

HISTORY GHS LINEAR BP: 0.08

HISTORY GHS LINEAR BP: 0.02

HISTORY GHS INV pivot: 0.102, amount: 1.93, local: 0.00 [0.00 1.00]

HISTORY GHS pivot: 0.137, amount: 1.05, local: 0.00 [0.00 1.00]

HISTORY GHS pivot: 0.283, amount: 2.38, local: 0.00 [0.00 1.00]

HISTORY GHS INV pivot: 0.079, amount: 1.31, local: 0.00 [0.00 1.00]

HISTORY GraXpert AI denoise: strength 0.50

HISTORY GraXpert AI deconvolve: strength 0.50

HISTORY Trail Removal

HISTORY Trail Removal

HISTORY Cosmic Clarity sharpen (Both)

HISTORY Apply Signature

SUBEXP = 30 /

CAMID = '1E1E560D0B020900' /

PIERSIDE= 'EAST' /

ADCBITS = 16 / Bit depth of camera sensor ADC in current mode

BIASADU = 121.16593933105469 / ADU for bias level (no photons) at current sett

EGAINSAV= 0.26355 / Electrons per ADU at saved bit depth

RELGAIN = 2.964 / Multiplicative gain relative to minumum

RDNOISE = 1.77 / Read noise in electrons

COLORTYP= 'RGB' /

DATE-END= '2025-09-11T02:00:06.8357835' / System Clock:Est. Frame End

DATE-AVG= '2025-09-11T01:42:27.4104789' / System Clock:Est. Frame Mid Point

JD_UTC = 2460929.571150584 / Julian Date at mid exposure

END

Done