ES127_46m30s_NGC3031 (M81, Bode's Galaxy)

SIMPLE = T / file does conform to FITS standard

BITPIX = -32 / number of bits per data pixel

NAXIS = 3 / number of data axes

NAXIS1 = 5609 / length of data axis 1

NAXIS2 = 3792 / 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 = '2025-10-03T15:00:00' / UTC date that FITS file was created

DATE-OBS= '2025-10-02T00:57:13.876618' / YYYY-MM-DDThh🇲🇲ss observation start,

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

EXPTIME = 2790. / [s] Exposure time duration

OBSERVER= 'DaveMartin' / Observer name

FILTER = 'Open ' / Active filter name

FOCALLEN= 957.282 / [mm] Focal length

CENTALT = 18.8316666666667 / [deg] Altitude of telescope

CENTAZ = 356.475833333333 / [deg] Azimuth of telescope

XBINNING= 1 / Camera binning mode

YBINNING= 1 / Camera binning mode

XPIXSZ = 3.75999999046326 / [um] Pixel X axis size

YPIXSZ = 3.75999999046326 / [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 = 14.2299995422363 / [degC] Focuser temperature

OBJECT = 'NGC3031 (M81, Bodes Galaxy)' / Name of the object of interest

AIRMASS = 3.06800113326292 / Airmass at frame center (Gueymard 1993)

SITELAT = 39.3488888888889 / [deg] Observation site latitude

SITELONG= -78.8116666666667 / [deg] Observation site longitude

OBJCTRA = '09 55 48.848' / [H M S] Image center Right Ascension

OBJCTDEC= '+69 17 31.886' / [D M S] Image center Declination

RA = 148.953531933572 / [deg] Image center Right Ascension

DEC = 69.2921906162125 / [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 = 2784.5 / Axis1 reference pixel

CRPIX2 = 1890.5 / Axis2 reference pixel

CRVAL1 = 148.945334134965 / [deg] Axis1 reference value

CRVAL2 = 69.2883530857642 / [deg] Axis2 reference value

LONPOLE = 180. / Native longitude of celestial pole

CDELT1 = -0.000224800189713318 / [deg] X pixel size

CDELT2 = 0.000225291146923613 / [deg] Y pixel size

PC1_1 = -0.355449807949834 / Linear transformation matrix (1, 1)

PC1_2 = -0.934695369641054 / Linear transformation matrix (1, 2)

PC2_1 = 0.934861765647426 / Linear transformation matrix (2, 1)

PC2_2 = -0.355011942236564 / 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 = -2.14197489256561E-07

A_1_1 = -2.90724235491365E-08

A_0_2 = -9.4540404482732E-08

A_3_0 = -3.2983456846551E-10

A_2_1 = 8.0677506465887E-12

A_1_2 = -3.16408219516367E-10

A_0_3 = -8.79674637888312E-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 = -2.74226301408309E-08

B_1_1 = -9.91430900592269E-08

B_0_2 = -6.94792858056584E-08

B_3_0 = 2.47791609194765E-12

B_2_1 = -3.1083125822795E-10

B_1_2 = 1.17268472647321E-11

B_0_3 = -3.1535023000452E-10

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

AP_0_0 = -0.00493732390209011

AP_1_0 = -1.63025603612255E-05

AP_0_1 = 5.18359300191333E-07

AP_2_0 = 2.18141380287435E-07

AP_1_1 = 2.96441303651151E-08

AP_0_2 = 9.59688951877832E-08

AP_3_0 = 3.34950498291984E-10

AP_2_1 = -8.27607302905692E-12

AP_1_2 = 3.21874509834319E-10

AP_0_3 = 8.77732246132638E-12

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

BP_0_0 = -0.00113553033914596

BP_1_0 = 7.24143935236979E-07

BP_0_1 = -1.09453140192395E-05

BP_2_0 = 2.78502429460243E-08

BP_1_1 = 1.00705928474171E-07

BP_0_2 = 7.03021862296194E-08

BP_3_0 = -2.56872201200044E-12

BP_2_1 = 3.15527920092185E-10

BP_1_2 = -1.2098014369046E-11

BP_0_3 = 3.19002192248202E-10

HISTORY Apply Signature

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= '2025-10-02T01:24:24.4642098' / System Clock:Est. Frame Mid Point

DATE-END= '2025-10-02T01:51:35.0518010' / System Clock:Est. Frame End

EGAINSAV= 0.26355 / Electrons per ADU at saved bit depth

JD_UTC = 2460950.558616484 / Julian Date at mid exposure

PIERSIDE= 'EAST' /

RDNOISE = 1.77 / Read noise in electrons

RELGAIN = 2.964 / Multiplicative gain relative to minumum

SUBEXP = 30 /

END

Done