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Sample header info
Folks,
I think that it would be a mistake to not include easily
computable information like airmass and heliocentric JD in the
header at the time of image creation. This removes an inevitable
impediment to progress later on. I also think that it *is* a
good idea to record the steps of how the image has been mutilated.
Here is a FITS header from a WIYN image I took a few years back
for reference. It is overkill, to be sure, but it does illustrate
what others have done. (I would have added HJD, as well).
Cheers,
Doug
dcd0009.imh[2043,2042][real]: M13 B 15sec
No bad pixels, min=unknown, max=unknown
Line storage mode, physdim [2048,2042], length of user area 2512 s.u.
Created Mon 16:03:34 08-Mar-1999, Last modified Mon 16:03:34 08-Mar-1999
Pixel file "HDR$dcd0009.pix" [ok]
'KPNO-IRAF' /
'15-07-97' /
New copy of dcd0009.imh
IRAF-MAX= 0.000000E0 / DATA MAX
IRAF-MIN= 0.000000E0 / DATA MIN
IRAF-BPX= 32 / DATA BITS/PIXEL
IRAFTYPE= 'REAL ' / PIXEL TYPE
HDR_REV = '1.010 13Jul94 (title @ end of pic; UTSHUT)' /
ORIGPIC = 'obj0371' / Original picture file name
OPICNUM = 371 / Original picture number
NAMPSYX = '1 1' / Num amps in y & x (eg. '2 2'=quad)
AMPLIST = '11' / Readout order in y,x
OBSERVAT= 'KPNO' / Origin of data
TELESCOP= 'WIYN3.5m' / Specific system
DETECTOR= 's2kb' / Detector (CCD type, photon counter, etc.)
IMAGETYP= 'OBJECT' / Type of picture (object, dark, etc.)
PREFLASH= 0.000000 / Preflash time in secs
CCDSUM = '1 1' / On chip summation (X,Y)
CCDSEC = '[1:2043,3:2044]' / Section in full CCD for DATASEC
CAMTEMP = -110.3 / CCD Temperature
DEWTEMP = -176.2 / Dewar Temperature
DATE-OBS= '13/07/97' / Date (dd/mm/yy) of observation
UTSHUT = '16:34:45.0' / UT of shutter open
EXPTIME = 15.000 / Exposure time in secs
DARKTIME= 18.247 / Total elapsed time in secs
DCS_TIME= 3000 / (ns) DCS integrator slope time
GAIN = '7.5' / electrons per ADU
RDNOISE = '14' / electrons
READTIME= 20200 / (ns) unbinned pixel read time
WAVEFILE= 's2kb Sat Jul 12 16:02:11 1997' /
RECID = 'wiyn.imager.970715.064520' / archive ID for observation
UT = ' 6:45:19.02' / universal time
ST = '18:51:34.34' / sidereal time
EL = '62:55:40.75' / elevation
AZ = '-71:26:34.29' / azimuth
TRACK = 'enabled' / tracking
COORDS = 'Helio. mean FK5' / coordinate system
RA = '16:41:49.16' / Telescope RA
DEC = '36:27:13.16' / Telescope DEC
RAOFFST = '00:00:0.00' / Telescope RA offset
DECOFFST= '00:00:0.00' / Telescope DEC offset
RADECSYS= 'FK5' / coordinate system
TARGRA = '16:39:54.19' / right ascension
TARGDEC = '36:33:16.30' / declination
EQUINOX = 1997.6 / equinox of position
EPOCH = 1997.6 / same as EQUINOX (for back compat.)
ZD = 27.112 / zenith distance
AIRMASS = 1.123176 / airmass at start of exposure
ROTANGLE= -27.1 / rotator angle, degrees CW from N
FILTERS = 'Harris_B' / fsa filter name
FILTNUM = 6 / fsa filter number
FILTWHEL= 2 / fsa filter wheel
TRIM = 'Jul 15 15:40 Trim data section is [1:2043,3:2044]'
OVERSCAN= 'Jul 15 15:40 Overscan section is [2049:2080,1:2048] with mean=757.98'
ZEROCOR = 'Jul 15 15:40 Zero level correction image is Zero'
CCDPROC = 'Mar 8 16:03 CCD processing done'
HISTORY New copy of obj0371.imh
WCSDIM = 2
LTV2 = -2.
LTM1_1 = 1.
LTM2_2 = 1.
WAT0_001= 'system=physical'
WAT1_001= 'wtype=linear'
WAT2_001= 'wtype=linear'
FLATCOR = 'Mar 8 16:03 Flat field image is FlatHarris_B with scale=11798.85'