RC71_30m30s_IC0434 (Horsehead Nebula, Orion B)_ReducedStars

SIMPLE = T / file does conform to FITS standard

BITPIX = 16 / number of bits per data pixel

NAXIS = 3 / number of data axes

NAXIS1 = 5007 / length of data axis 1

NAXIS2 = 3313 / 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

MIPS-HI = 65535 / Lower visualization cutoff

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

DATE = '2025-09-05T17:06:14' / UTC date that FITS file was created

DATE-OBS= '2025-09-03T07:47:09.267542' / YYYY-MM-DDThh🇲🇲ss observation start,

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

EXPTIME = 1830. / [s] Exposure time duration

OBSERVER= 'DaveMartin' / Observer name

FILTER = 'mixed ' / Active filter name

FOCALLEN= 350.23 / [mm] Focal length

CENTALT = 24.0991666666667 / [deg] Altitude of telescope

CENTAZ = 115.277222222222 / [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 = 33201 / [step] Focuser position

FOCTEMP = 9.84000015258789 / [degC] Focuser temperature

STACKCNT= 2 / Stack frames

LIVETIME= 3660. / [s] Exposure time after deadtime correction

OBJECT = 'IC0434 (Horsehead Nebula, Orion B)' / Name of the object of interest

AIRMASS = 2.43479916985599 / Airmass at frame center (Gueymard 1993)

SITELAT = 39.3488888888889 / [deg] Observation site latitude

SITELONG= -78.8116666666667 / [deg] Observation site longitude

OBJCTRA = '05 40 31.794' / [H M S] Image center Right Ascension

OBJCTDEC= '-02 24 35.066' / [D M S] Image center Declination

RA = 85.1324766100387 / [deg] Image center Right Ascension

DEC = -2.40974050855275 / [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 = 2565.5 / Axis1 reference pixel

CRPIX2 = 1486.5 / Axis2 reference pixel

CRVAL1 = 85.2341341042268 / [deg] Axis1 reference value

CRVAL2 = -2.4558836476365 / [deg] Axis2 reference value

LONPOLE = 180. / Native longitude of celestial pole

CDELT1 = -0.000615265260750159 / [deg] X pixel size

CDELT2 = 0.000614968375501954 / [deg] Y pixel size

PC1_1 = 0.0794083577694203 / Linear transformation matrix (1, 1)

PC1_2 = 0.996842170414336 / Linear transformation matrix (1, 2)

PC2_1 = -0.996753807467596 / Linear transformation matrix (2, 1)

PC2_2 = 0.0805099204995885 / 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 = -3.79677154119047E-08

A_1_1 = 7.38342030330063E-08

A_0_2 = 3.79720296820246E-08

A_3_0 = -4.0324918048076E-11

A_2_1 = -3.29565885448712E-12

A_1_2 = -3.15341842919888E-11

A_0_3 = -5.64825366267551E-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 = -2.95818634164737E-08

B_1_1 = -7.01783412603652E-09

B_0_2 = 6.37999469584622E-08

B_3_0 = -1.1830595845234E-12

B_2_1 = -3.6090721607276E-11

B_1_2 = -3.56608103304676E-12

B_0_3 = -3.98995352329986E-11

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

AP_0_0 = -6.78978013124636E-05

AP_1_0 = -1.98812997398434E-07

AP_0_1 = -1.76803289727692E-08

AP_2_0 = 3.80426138529127E-08

AP_1_1 = -7.39458324637942E-08

AP_0_2 = -3.80036649006719E-08

AP_3_0 = 4.03953162484519E-11

AP_2_1 = 3.29680404894911E-12

AP_1_2 = 3.15972819765301E-11

AP_0_3 = 5.66102140439871E-12

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

BP_0_0 = -5.9377198142655E-06

BP_1_0 = -2.57587180113559E-08

BP_0_1 = -1.40977118756602E-07

BP_2_0 = 2.96142451666252E-08

BP_1_1 = 7.03465727719834E-09

BP_0_2 = -6.38693631944821E-08

BP_3_0 = 1.18996527009289E-12

BP_2_1 = 3.61456285132576E-11

BP_1_2 = 3.57731662253042E-12

BP_0_3 = 3.99567245871633E-11

SUBEXP = 30 /

CAMID = '1E1E560D0B020900' /

PIERSIDE= 'WEST' /

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= '2025-09-03T08:23:51.4900595' / System Clock:Est. Frame End

DATE-AVG= '2025-09-03T08:05:30.3788009' / System Clock:Est. Frame Mid Point

JD_UTC = 2460921.837157162 / Julian Date at mid exposure

END

Done