m42_B_100s_00009_df.fits
TARGET  = '                '   / target
EXPTIME =                 100. / exposure time (seconds)
FILTER  = ' (2) B (375-490)'   / filter
DATE-OBS= '2012-11-18T06:33:06.291' / date of observation (UT)

m42_R_100s_00011_df.fits
TARGET  = '                '   / target
EXPTIME =                 100. / exposure time (seconds)
FILTER  = ' (4) R (570-690) '  / filter
DATE-OBS= '2012-11-18T06:30:04.692' / date of observation (UT)

m42_V_100s_00010_df.fits
TARGET  = '                '   / target
EXPTIME =                 100. / exposure time (seconds)
FILTER  = ' (3) V (490-580)  ' / filter
DATE-OBS= '2012-11-18T06:27:11.356' / date of observation (UT)