General description: Raw guider images are processed at APO, resulting in prog-gimg files. See Processed Guider Images at APO for further information.
Naming convention: proc-gimg-[DDDD].fits, The four digits look like some kind of timestamp but bear no resemblance to the times in the headers. Probably they are simply a sequence number.
Approximate size: 864000 bytes.
File type: FITS
Read by products: ???
Written by products: ???
Sample Header (HDU 0):
SIMPLE = T / conforms to FITS standard BITPIX = 16 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 512 NAXIS2 = 512 EXTEND = T IMAGETYP= 'object ' EXPTIME = 10.0 TIMESYS = 'TAI ' DATE-OBS= '2009-11-11 02:41:37.4Z' / start of integration CCDTEMP = -40.099995 / degrees C FILENAME= '/data/gcam/55146/gimg-0200.fits' OBJECT = 'gimg-0200' DARKFILE= '/data/gcam/55145/gimg-0004.fits' FLATFILE= '/data/gcam/55146/gimg-0178.fits' FLATCART= 11 BEGX = 0 BEGY = 0 BINX = 1 BINY = 1 CRVAL1 = 0 / (output) Column pixel of Reference Pixel CRVAL2 = 0 / (output) Row pixel of Reference Pixel CRPIX1 = 0.5 / Column Pixel Coordinate of Reference CRPIX2 = 0.5 / Row Pixel Coordinate of Reference CTYPE1 = 'LINEAR ' / Type of projection CUNIT1 = 'PIXEL ' / Column unit CUNIT2 = 'PIXEL ' / Row unit SDSSFMT = 'GPROC 1 2' / type major minor version for this file IMGBACK = 1821.0 / crude background for entire image. For displays SEEING = 1.733515205482617 / Estimate of current seeing, arcsec fwhm GCAMSCAL= 0.026 / guide camera plate scale (mm/pixel) PLATSCAL= 217.7358 / plug plate scale (mm/degree) OBJSYS = 'ICRS ' / The TCC objSys RA = 346.000329 / RA of telescope boresight (deg) DEC = 0.001893 / Dec of telescope boresight (deg) RADEG = 346.0 / RA of telescope pointing(deg) DECDEG = 0.0 / Dec of telescope pointing (deg) ROTTYPE = 'Obj ' / Rotator request type -------------------------------- ROTPOS = 0.0 / Rotator request position (deg) Ask Russell BOREOFFX= 0.0 / TCC Boresight offset, deg BOREOFFY= 0.0 / TCC Boresight offset, deg ARCOFFX = 0.000329 / TCC ObjArcOff, deg ARCOFFY = 0.001893 / TCC ObjArcOff, deg OBJOFFX = 0.0 / TCC ObjOff, deg OBJOFFY = 0.0 / TCC ObjOff, deg CALOFFX = 0.0 / TCC CalibOff, deg CALOFFY = 0.0 / TCC CalibOff, deg CALOFFR = 0.0 / TCC CalibOff, deg GUIDOFFX= 0.0 / TCC GuideOff, deg GUIDOFFY= 0.0 / TCC GuideOff, deg GUIDOFFR= 0.019667 / TCC GuideOff, deg AZ = 2.222 / Azimuth axis pos. (approx, deg) ALT = 57.284 / Altitude axis pos. (approx, deg) IPA = 181.833 / Rotator axis pos. (approx, deg) SPA = 1.642730458961487 / TCC SpiderInstAng FOCUS = 491.23 / User-specified focus offset (um) M2PISTON= 996.71 / TCC SecOrient M2XTILT = -3.98 / TCC SecOrient M2YTILT = -8.960000000000001 / TCC SecOrient M2XTRAN = 10.17 / TCC SecOrient M2YTRAN = 77.39 / TCC SecOrient M1PISTON= -790.01 / TCC PrimOrient M1XTILT = -3.04 / TCC PrimOrient M1YTILT = 5.26 / TCC PrimOrient M1XTRAN = 277.25 / TCC PrimOrient Ask Russell M1YTRAN = 178.07 / TCC PrimOrient --------------------------- SCALE = 1.00008 / User-specified scale factor **2.5 Telescope scale factor to match project sky on focal plane FF = '0 0 0 0 ' / FF lamps 1:on 0:0ff NE = '0 0 0 0 ' / NE lamps 1:on 0:0ff HGCD = '0 0 0 0 ' / HGCD lamps 1:on 0:0ff FFS = '0 0 0 0 0 0 0 0' / Flatfield Screen 1:closed 0:open NAME = '3564-55145-01' / The name of the currently loaded plate PLATEID = 3564 / The currently loaded plate CARTID = 11 / The currently loaded cartridge MAPID = 1 / The mapping version of the loaded plate POINTING= 'A ' / The currently specified pointing DRA = 5.666343482725871E-06 / measured offset in RA, deg **by how much the guider thinks the telescope is wrong DDEC = 1.981334345452099E-05 / measured offset in Dec, deg " DROT = 0.0003566108349008755 / measured rotator offset, deg " DFOCUS = -8.278618687226965 / measured focus offset, um " DSCALE = 2.031682903707919E-05 / measured scale offset, % " FILTRA = -3.399806089635522E-06 / filtered offset in RA, deg **measured offsets modified by PID loop coeffs FILTDEC = -1.188800607271259E-05 / filtered offset in Dec, deg " FILTROT = -0.0001783054174504378 / filtered rotator offset, deg " FILTFCUS= 0.8278618687226965 / filtered focus offset, um " FILTSCLE= -1.01584145185396E-05 / filtered scale offset, % " OFFRA = -3.399806089635522E-06 / applied offset in RA, deg **offsets actually applied, typically same as filtered value unless correction is off OFFDEC = -1.188800607271259E-05 / applied offset in Dec, deg " OFFROT = -0.0001783054174504378 / applied rotator offset, deg " OFFFOCUS= 0.8278618687226965 / applied focus offset, um " OFFSCALE= 0.0 / applied scale offset, % " END
HDU 1: The bitmask image for image 0
XTENSION= 'IMAGE ' / Image extension BITPIX = 8 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 512 NAXIS2 = 512 PCOUNT = 0 / number of parameters GCOUNT = 1 / number of groups
HDU 2: guide fiber rotated images nominally 16 for BOSS
XTENSION= 'IMAGE ' / Image extension BITPIX = 16 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 19 NAXIS2 = 285 PCOUNT = 0 / number of parameters GCOUNT = 1 / number of groups
HDU 3: guider rotated masks
XTENSION= 'IMAGE ' / Image extension BITPIX = 8 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 19 NAXIS2 = 285 PCOUNT = 0 / number of parameters GCOUNT = 1 / number of groups
HDU 4: nominally 2 acquisition fibers for BOSS
XTENSION= 'IMAGE ' / Image extension BITPIX = 16 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 59 NAXIS2 = 118 PCOUNT = 0 / number of parameters GCOUNT = 1 / number of groups END
HDU 5: masks for acquisition fibers for BOSS
XTENSION= 'IMAGE ' / Image extension BITPIX = 16 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 59 NAXIS2 = 118 PCOUNT = 0 / number of parameters GCOUNT = 1 / number of groups END
HDU 6: A binary table containing information about the guide probes and guide stars. Each entry is for one guide probe; data is listed in probe number order (starting from 1).
XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 99 / length of dimension 1 NAXIS2 = 17 / length of dimension 2 PCOUNT = 0 / number of group parameters GCOUNT = 1 / number of groups TFIELDS = 24 / number of table fields TTYPE1 = 'exists ' TFORM1 = 'L ' TTYPE2 = 'enabled ' TFORM2 = 'L ' TTYPE3 = 'flags ' TFORM3 = 'L ' TTYPE4 = 'xFocal ' TFORM4 = 'E ' TTYPE5 = 'yFocal ' TFORM5 = 'E ' TTYPE6 = 'xCenter ' TFORM6 = 'E ' TTYPE7 = 'yCenter ' TFORM7 = 'E ' TTYPE8 = 'radius ' TFORM8 = 'E ' TTYPE9 = 'xFerruleOffset' TFORM9 = 'E ' TTYPE10 = 'yFerruleOffset' TFORM10 = 'E ' TTYPE11 = 'rotation' TFORM11 = 'E ' TTYPE12 = 'rotStar2Sky' TFORM12 = 'E ' TTYPE13 = 'focusOffset' TFORM13 = 'E ' TTYPE14 = 'fiber_type' TFORM14 = '20A ' TTYPE15 = 'xstar ' TFORM15 = 'E ' TTYPE16 = 'ystar ' TFORM16 = 'E ' TTYPE17 = 'dx ' TFORM17 = 'E ' TTYPE18 = 'dy ' TFORM18 = 'E ' TTYPE19 = 'dRA ' TFORM19 = 'E ' TTYPE20 = 'dDec ' TFORM20 = 'E ' TTYPE21 = 'fwhm ' TFORM21 = 'E ' TTYPE22 = 'poserr ' TFORM22 = 'E ' TTYPE23 = 'stampSize' TFORM23 = 'I ' TTYPE24 = 'stampIdx' TFORM24 = 'I ' END