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include <error.h>
include <imhdr.h>
include <ctype.h>
# T_SETJD -- Set Julian dates
# This task computes the Geocentric Julian date, the Helocentric Julian Date,
# and the local Julian day for a list of images. Any set of these may
# be output. The input keywords include the date of observation, the
# time of observation, the exposure time, and the RA/DEC/EPOCH of observation.
# If an exposure time specified the times are corrected to midexposure.
procedure t_setjd()
pointer imlist # List of images
pointer date_key # Date keyword
pointer time_key # Time keyword
pointer exp_key # Exposure keyword
pointer ra_key # RA keyword (hours)
pointer dec_key # DEC keyword (hours)
pointer ep_key # RA/DEC epoch keyword
pointer ujd_key # JD keyword
pointer hjd_key # HJD keyword
pointer ljd_key # Local JD keyword
bool utdate # UT date?
bool uttime # UT time?
bool listonly # List only?
pointer observatory # Observatory
bool newobs, obshead
int i, year, month, day, flags
double zone, exp, time, ra, dec, ep, epoch, ujd, hjd, ljd, lt
pointer im, obs, sp, input, date, ep_str
bool clgetb()
int nowhite(), imtgetim(), ctod(), dtm_decode()
pointer imtopenp(), immap()
double imgetd(), obsgetd(), ast_julday()
errchk immap, obsobpen, obsgetd, obsimopen, imgstr, imgetd
begin
call smark (sp)
call salloc (input, SZ_FNAME, TY_CHAR)
call salloc (observatory, SZ_FNAME, TY_CHAR)
call salloc (date_key, SZ_FNAME, TY_CHAR)
call salloc (time_key, SZ_FNAME, TY_CHAR)
call salloc (exp_key, SZ_FNAME, TY_CHAR)
call salloc (ra_key, SZ_FNAME, TY_CHAR)
call salloc (dec_key, SZ_FNAME, TY_CHAR)
call salloc (ep_key, SZ_FNAME, TY_CHAR)
call salloc (ep_str, SZ_FNAME, TY_CHAR)
call salloc (ujd_key, SZ_FNAME, TY_CHAR)
call salloc (hjd_key, SZ_FNAME, TY_CHAR)
call salloc (ljd_key, SZ_FNAME, TY_CHAR)
call salloc (date, SZ_FNAME, TY_CHAR)
# Get the parameters
imlist = imtopenp ("images")
call clgstr ("observatory", Memc[observatory], SZ_FNAME)
obs = NULL
call clgstr ("date", Memc[date_key], SZ_FNAME)
call clgstr ("time", Memc[time_key], SZ_FNAME)
call clgstr ("exposure", Memc[exp_key], SZ_FNAME)
call clgstr ("ra", Memc[ra_key], SZ_FNAME)
call clgstr ("dec", Memc[dec_key], SZ_FNAME)
call clgstr ("epoch", Memc[ep_key], SZ_FNAME)
call clgstr ("jd", Memc[ujd_key], SZ_FNAME)
call clgstr ("hjd", Memc[hjd_key], SZ_FNAME)
call clgstr ("ljd", Memc[ljd_key], SZ_FNAME)
i = nowhite (Memc[date_key], Memc[date_key], SZ_FNAME)
i = nowhite (Memc[time_key], Memc[time_key], SZ_FNAME)
i = nowhite (Memc[exp_key], Memc[exp_key], SZ_FNAME)
i = nowhite (Memc[ra_key], Memc[ra_key], SZ_FNAME)
i = nowhite (Memc[dec_key], Memc[dec_key], SZ_FNAME)
i = nowhite (Memc[ep_key], Memc[ep_key], SZ_FNAME)
i = nowhite (Memc[ujd_key], Memc[ujd_key], SZ_FNAME)
i = nowhite (Memc[hjd_key], Memc[hjd_key], SZ_FNAME)
i = nowhite (Memc[ljd_key], Memc[ljd_key], SZ_FNAME)
utdate = clgetb ("utdate")
uttime = clgetb ("uttime")
listonly = clgetb ("listonly")
# Set log header
call printf ("#%19s")
call pargstr ("Image")
if (nowhite (Memc[ujd_key], Memc[ujd_key], SZ_LINE) != 0) {
call printf (" %13s")
call pargstr (Memc[ujd_key])
}
if (nowhite (Memc[hjd_key], Memc[hjd_key], SZ_LINE) != 0) {
call printf (" %13s")
call pargstr (Memc[hjd_key])
}
if (nowhite (Memc[ljd_key], Memc[ljd_key], SZ_LINE) != 0) {
call printf (" %8s")
call pargstr (Memc[ljd_key])
}
call printf ("\n")
# Loop over all images
while (imtgetim (imlist, Memc[input], SZ_FNAME) != EOF) {
iferr {
im = NULL
if (listonly)
i = immap (Memc[input], READ_ONLY, 0)
else
i = immap (Memc[input], READ_WRITE, 0)
im = i
# Get time zone for the observatory.
call obsimopen (obs, im, Memc[observatory], NO, newobs, obshead)
if (newobs)
call obslog (obs, "SETJD", "timezone", STDOUT)
zone = obsgetd (obs, "timezone")
# Determine the date and time of observation.
call imgstr (im, Memc[date_key], Memc[date], SZ_LINE)
if (dtm_decode (Memc[date],year,month,day,time,flags) == ERR)
call error (1, "Error in date keyword")
if (IS_INDEFD(time))
time = imgetd (im, Memc[time_key])
# Correct to midexposure if desired.
if (Memc[exp_key] != EOS) {
if (Memc[exp_key] == '-')
exp = -imgetd (im, Memc[exp_key+1])
else
exp = imgetd (im, Memc[exp_key])
time = time + exp / (2 * 3600.)
}
# Compute UJD and LJD.
call ast_date_to_epoch (year, month, day, time, epoch)
ujd = ast_julday (epoch)
if (utdate) {
if (uttime)
ljd = ujd - zone / 24.
else {
ljd = ujd
ujd = ljd + zone / 24.
}
} else {
if (uttime) {
if (time - zone < 0.)
ujd = ujd + 1
if (time + zone >= 24.)
ujd = ujd - 1
ljd = ujd - zone / 24.
} else {
ljd = ujd
ujd = ljd + zone / 24.
}
}
# Get RA, DEC, EPOCH if needed.
if (Memc[hjd_key] != EOS) {
ra = imgetd (im, Memc[ra_key])
dec = imgetd (im, Memc[dec_key])
ep = INDEFD
if (Memc[ep_key] != EOS) {
call imgstr (im, Memc[ep_key], Memc[ep_str], SZ_FNAME)
if (nowhite (Memc[ep_str],Memc[ep_str],SZ_FNAME) > 0) {
call strupr (Memc[ep_str])
i = 1
if (Memc[ep_str] == 'B' || Memc[ep_str] == 'J')
i = 2
if (ctod (Memc[ep_str], i, ep) == 0)
call error (0, "Epoch not understood")
if (ep < 1800. || ep > 2100.) {
call eprintf (
"# Warning: Epoch %d is unlikely.\n")
call pargstr (Memc[ep_str])
}
}
}
}
# Print results.
call printf ("%20s")
call pargstr (Memc[input])
if (Memc[ujd_key] != EOS) {
call imaddd (im, Memc[ujd_key], ujd)
call printf (" %13.5f")
call pargd (ujd)
}
if (Memc[hjd_key] != EOS) {
call ast_precess (ra, dec, ep, ra, dec, epoch)
call ast_jd_to_hjd (ra, dec, ujd, lt, hjd)
call imaddd (im, Memc[hjd_key], hjd)
call printf (" %13.5f")
call pargd (hjd)
}
if (Memc[ljd_key] != EOS) {
ljd = int (ljd)
call imaddd (im, Memc[ljd_key], ljd)
call printf (" %8d")
call pargi (int (ljd))
}
call printf ("\n")
} then
call erract (EA_WARN)
if (im != NULL)
call imunmap (im)
}
call obsclose (obs)
call sfree (sp)
end
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