ES127_27m0s_C27 (NGC 6888,Crescent Nebula)

SIMPLE = T / file does conform to FITS standard

BITPIX = -32 / number of bits per data pixel

NAXIS = 3 / number of data axes

NAXIS1 = 5476 / length of data axis 1

NAXIS2 = 3829 / 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-beta4' / Software that created this HDU

DATE = '2025-10-03T14:46:09' / UTC date that FITS file was created

DATE-OBS= '2025-10-02T00:03:51.750446' / YYYY-MM-DDThh🇲🇲ss observation start,

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

EXPTIME = 1620. / [s] Exposure time duration

OBSERVER= 'DaveMartin' / Observer name

FILTER = 'Open ' / Active filter name

FOCALLEN= 958.351 / [mm] Focal length

CENTALT = 89.045 / [deg] Altitude of telescope

CENTAZ = 163.905277777778 / [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= 0. / [degC] CCD temperature

SET-TEMP= 0. / [degC] CCD temperature setpoint

GAIN = 100 / Sensor gain

OFFSET = 12 / Sensor gain offset

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

FOCPOS = 19894 / [step] Focuser position

FOCTEMP = 15.1000003814697 / [degC] Focuser temperature

OBJECT = 'C27 (NGC 6888,Crescent Nebula)' / Name of the object of interest

AIRMASS = 1.00012788952518 / Airmass at frame center (Gueymard 1993)

SITELAT = 39.3488888888889 / [deg] Observation site latitude

SITELONG= -78.8116666666667 / [deg] Observation site longitude

OBJCTRA = '20 11 49.225' / [H M S] Image center Right Ascension

OBJCTDEC= '+38 18 38.723' / [D M S] Image center Declination

RA = 302.955105993462 / [deg] Image center Right Ascension

DEC = 38.310756355532 / [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 = 2512.5 / Axis1 reference pixel

CRPIX2 = 1842.5 / Axis2 reference pixel

CRVAL1 = 302.99693830452 / [deg] Axis1 reference value

CRVAL2 = 38.3528192243345 / [deg] Axis2 reference value

LONPOLE = 180. / Native longitude of celestial pole

CDELT1 = -0.000224785664728511 / [deg] X pixel size

CDELT2 = 0.000224803732880402 / [deg] Y pixel size

PC1_1 = 0.345064884988848 / Linear transformation matrix (1, 1)

PC1_2 = 0.938578832676101 / Linear transformation matrix (1, 2)

PC2_1 = -0.938541481435557 / Linear transformation matrix (2, 1)

PC2_2 = 0.345166463644356 / 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 = -1.33515070683457E-07

A_1_1 = -1.85753155144464E-08

A_0_2 = -6.96165946577253E-08

A_3_0 = -3.15530686133278E-10

A_2_1 = 3.61543320960793E-12

A_1_2 = -3.12243251827388E-10

A_0_3 = 2.3408577488978E-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 = -2.18299016474063E-08

B_1_1 = -6.18241175157028E-08

B_0_2 = -5.48863575115984E-08

B_3_0 = 1.36721019773087E-12

B_2_1 = -3.10309404002022E-10

B_1_2 = 4.46926528470426E-12

B_0_3 = -3.14868604350938E-10

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

AP_0_0 = -0.00247747675514094

AP_1_0 = -1.56112991080981E-05

AP_0_1 = 4.84918500750286E-07

AP_2_0 = 1.35781106151762E-07

AP_1_1 = 1.89932975392859E-08

AP_0_2 = 7.0457637242888E-08

AP_3_0 = 3.20238760091932E-10

AP_2_1 = -3.75367905351394E-12

AP_1_2 = 3.17586891385176E-10

AP_0_3 = -2.44990734207133E-12

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

BP_0_0 = -0.000880871618802793

BP_1_0 = 4.34547820056161E-07

BP_0_1 = -1.11806676068582E-05

BP_2_0 = 2.21684065842865E-08

BP_1_1 = 6.26022469778019E-08

BP_0_2 = 5.55312447442106E-08

BP_3_0 = -1.41805563196242E-12

BP_2_1 = 3.1493469572289E-10

BP_1_2 = -4.69364845423484E-12

BP_0_3 = 3.18577071899455E-10

PLTSOLVD= T / Siril internal solver

HISTORY Plate Solve

HISTORY Crop (x=612, y=101, w=5476, h=3829)

HISTORY Background extraction (Correction: Subtraction)

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=False b=0.00

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

HISTORY StatStretch: m=0.20 l=True n=True c=True b=0.10

HISTORY Cosmic Clarity denoise (luminance, str=0.5)

HISTORY Cosmic Clarity sharpen (Stellar Only)

HISTORY GHS pivot: 0.235, amount: 1.66, local: 0.00 [0.00 1.00]

HISTORY GHS LINEAR BP: 0.06

HISTORY GHS pivot: 0.213, amount: 3.50, local: -3.38 [0.00 1.00]

HISTORY GHS pivot: 0.341, amount: 0.90, local: 0.00 [0.00 1.00]

HISTORY GHS INV pivot: 0.168, amount: 0.86, local: 0.00 [0.00 1.00]

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

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

CAMID = '1E1E560D0B020900' /

COLORTYP= 'RGB' /

DATE-AVG= '2025-10-02T00:19:18.5384346' / System Clock:Est. Frame Mid Point

DATE-END= '2025-10-02T00:34:45.3264224' / System Clock:Est. Frame End

EGAINSAV= 0.26355 / Electrons per ADU at saved bit depth

JD_UTC = 2460950.5134090097 / Julian Date at mid exposure

PIERSIDE= 'WEST' /

RADESYS = 'ICRS' /

RDNOISE = 1.77 / Read noise in electrons

RELGAIN = 2.964 / Multiplicative gain relative to minumum

SUBEXP = 30 /

END

Done