ES127_16m0s_NGC6809 (M55)

SIMPLE = T / file does conform to FITS standard

BITPIX = -32 / number of bits per data pixel

NAXIS = 3 / number of data axes

NAXIS1 = 3963 / length of data axis 1

NAXIS2 = 3510 / 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 = '2025-09-23T18:06:37' / UTC date that FITS file was created

DATE-OBS= '2025-09-19T01:08:15.767743' / YYYY-MM-DDThh🇲🇲ss observation start,

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

EXPTIME = 960. / [s] Exposure time duration

OBSERVER= 'DaveMartin' / Observer name

FILTER = 'Open ' / Active filter name

FOCALLEN= 958.109 / [mm] Focal length

CENTALT = 19.5602777777778 / [deg] Altitude of telescope

CENTAZ = 185.030555555556 / [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= -10.1 / [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 = 19611 / [step] Focuser position

FOCTEMP = 19.8899993896484 / [degC] Focuser temperature

OBJECT = 'NGC6809 (M55)' / Name of the object of interest

AIRMASS = 2.96008439702911 / Airmass at frame center (Gueymard 1993)

SITELAT = 39.3488888888889 / [deg] Observation site latitude

SITELONG= -78.8116666666667 / [deg] Observation site longitude

OBJCTRA = '19 40 4.136' / [H M S] Image center Right Ascension

OBJCTDEC= '-30 56 43.248' / [D M S] Image center Declination

RA = 295.017232883375 / [deg] Image center Right Ascension

DEC = -30.9453466566413 / [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 = 1899.5 / Axis1 reference pixel

CRPIX2 = 1704.5 / Axis2 reference pixel

CRVAL1 = 294.997105055251 / [deg] Axis1 reference value

CRVAL2 = -30.9586685744109 / [deg] Axis2 reference value

LONPOLE = 180. / Native longitude of celestial pole

CDELT1 = -0.000224654408933106 / [deg] X pixel size

CDELT2 = 0.000225048284193237 / [deg] Y pixel size

PC1_1 = -0.35306538178811 / Linear transformation matrix (1, 1)

PC1_2 = -0.93559865122969 / Linear transformation matrix (1, 2)

PC2_1 = 0.935645481005566 / Linear transformation matrix (2, 1)

PC2_2 = -0.352941261223257 / 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 = -2.4729857380867E-07

A_1_1 = -4.39896300151425E-08

A_0_2 = -1.04638407485353E-07

A_3_0 = -3.23842515442074E-10

A_2_1 = 4.34793651916087E-12

A_1_2 = -3.24037808303716E-10

A_0_3 = 2.22997141442995E-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 = -2.72578109719343E-08

B_1_1 = -1.08043828433848E-07

B_0_2 = -1.1054034302183E-07

B_3_0 = -1.08042796508092E-12

B_2_1 = -3.1863856455706E-10

B_1_2 = 6.8574572965019E-12

B_0_3 = -3.23346481775344E-10

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

AP_0_0 = -0.00575586046975837

AP_1_0 = -1.59589095398704E-05

AP_0_1 = 7.94385544763556E-07

AP_2_0 = 2.51809679937172E-07

AP_1_1 = 4.48677408952687E-08

AP_0_2 = 1.06260067025743E-07

AP_3_0 = 3.28842959343902E-10

AP_2_1 = -4.50381982543623E-12

AP_1_2 = 3.29609065536176E-10

AP_0_3 = -2.39546234025188E-12

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

BP_0_0 = -0.0015123457622485

BP_1_0 = 5.36021635196922E-07

BP_0_1 = -1.12809047605467E-05

BP_2_0 = 2.77755076359616E-08

BP_1_1 = 1.09887071877365E-07

BP_0_2 = 1.11800551167147E-07

BP_3_0 = 1.0653486199894E-12

BP_2_1 = 3.23470105824258E-10

BP_1_2 = -7.16921801126466E-12

BP_0_3 = 3.27172949718206E-10

PLTSOLVD= T / Siril internal solver

HISTORY Plate Solve

HISTORY Crop (x=1225, y=282, w=3963, h=3510)

HISTORY Background extraction (Correction: Subtraction)

HISTORY Photometric CC (algorithm: SPCC)

HISTORY SCNR (type=average neutral, amount=1.00, preserve=true)

HISTORY GHS ASINH pivot: 0.000, amount: 61.11 [0.00 1.00]

HISTORY GHS ASINH pivot: 0.000, amount: 9.37 [0.00 1.00]

HISTORY GHS pivot: 0.000, amount: 3.72, local: 0.00 [0.00 1.00]

HISTORY Asinh Transformation: (stretch= 0.0, bp=0.09609)

HISTORY Histogram Transf. (mid=0.015, lo=0.214, hi=1.000)

HISTORY GHS LINEAR BP: 0.08

HISTORY GHS INV pivot: 0.232, amount: 1.93, local: 0.00 [0.00 1.00]

HISTORY GHS pivot: 0.281, amount: 2.14, local: 0.00 [0.00 1.00]

HISTORY GHS LINEAR BP: 0.04

HISTORY Cosmic Clarity denoise (luminance, str=0.5)

HISTORY GHS INV pivot: 0.176, amount: 1.05, local: 0.00 [0.00 1.00]

HISTORY Photometric CC (algorithm: PCC)

HISTORY Cosmic Clarity sharpen (Stellar Only)

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= '2025-09-19T01:26:34.2946291' / System Clock:Est. Frame End

DATE-AVG= '2025-09-19T01:17:25.0311862' / System Clock:Est. Frame Mid Point

JD_UTC = 2460937.553761935 / Julian Date at mid exposure

END

Done