1SIMPLE = T / conforms to FITS standard BITPIX = -32 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 2048 NAXIS2 = 4096 EXTEND = T RUN = 418552 / Run number OBSERVAT= 'LAPALMA ' / Name of observatory (IRAF style) OBSERVER= 'Drew ' / Name of principal investigator OBJECT = 'intphas_4970 Ha' / Title of observation LATITUDE= 28.761929 / Telescope latitude (degrees), +28:45:42.9 LONGITUD= -17.877577 / Telescope longitude (degrees), -17:52:39.3 HEIGHT = 2348 / [m] Height above sea level. SLATEL = 'LPO2.5 ' / Telescope name known to SLALIB TELESCOP= 'INT ' / 2.5m Isaac Newton Telescope MJD-OBS = 53240.9816151 / Modified Julian Date of midtime of observation JD = 2453241.4816151 / Julian Date of midtime of observation PLATESCA= 6.856013 / [d/m] Platescale ( 24.68arcsec/mm) TELFOCUS= 0.043969 / Telescope focus (metres) AIRMASS = 1.048846 / Effective mean airmass DATE-OBS= '2004-08-23T23:32:32.4' / UTC date start of observation UTSTART = '23:32:32.4' / UTC of start of observation TEMPTUBE= 10.15365 / Truss Temperature (degrees Celsius) INSTRUME= 'WFC ' / INT wide-field camera is in use. WFFPOS = 1 / Position-number of deployed filter WFFBAND = 'Halpha ' / Waveband of filter WFFID = '197 ' / Unique identifier of filter SECPPIX = 0.333 / Arcseconds per pixel DETECTOR= 'WFC ' / Formal name of camera CCDSPEED= 'FAST ' / Readout speed CCDXBIN = 1 / Binning factor in x axis CCDYBIN = 1 / Binning factor in y axis CCDSUM = '1 1 ' / Binning factors (IRAF style) CCDTEMP = 156.114 / [K] Cryostat temperature NWINDOWS= 0 / Number of readout windows CCDNAME = 'A5506-4 ' / Name of detector chip. CCDXPIXE= 1.35E-05 / [m] Size of pixels in x. CCDYPIXE= 1.35E-05 / [m] Size of pixels in y. AMPNAME = 'LH ' / Name of output amplifier. GAIN = 2.8 / Nominal Photo-electrons per ADU. READNOIS= 6.4 / Nominal Readout noise in electrons. NUMBRMS = 257 / Number of standards used STDCRMS = 0.067 / Astrometric fit error (arcsec) PERCORR = 0.0 / Sky calibration correction (mags) EXTINCT = 0.09 / Extinction coefficient (mags) RADESYSA= 'ICRS ' EQUINOX = 2000.0 CTYPE1 = 'RA---ZPN' / Algorithm type for axis 1 CTYPE2 = 'DEC--ZPN' / Algorithm type for axis 2 CRPIX1 = -337.20001 / [pixel] Reference pixel along axis 1 CRPIX2 = 3040.5 / [pixel] Reference pixel along axis 2 CRVAL1 = 292.20508 / [deg] Right ascension at the reference pixel CRVAL2 = 18.582556 / [deg] Declination at the reference pixel CRUNIT1 = 'deg ' / Unit of right ascension coordinates CRUNIT2 = 'deg ' / Unit of declination coordinates CD1_1 = -1.3007094E-06 / Transformation matrix element CD1_2 = -9.2396054E-05 / Transformation matrix element CD2_1 = -9.2389091E-05 / Transformation matrix element CD2_2 = 1.3203634E-06 / Transformation matrix element PV2_1 = 1.0 / Coefficient for r term PV2_2 = 0.0 / Coefficient for r**2 term PV2_3 = 220.0 / Coefficient for r**3 term ORIGZPT = 21.53 / Original nightly ZP; uncorrected for extinctionMAGZPT = 21.40896253966641 / Re-calibrated DR2 zeropoint EXPTIME = 120.02 / [sec] Exposure time assumed by the pipeline CHECKSUM= '7RREBPRB9PRBAPRB' / HDU checksum updated 2014-02-06T12:02:07 DATASUM = '1660673036' / data unit checksum updated 2014-02-06T12:02:07 HISTORY 20041004 14:45:42 HISTORY $Id: cir_create_file.c,v 1.10 2004/09/03 10:48:45 jim Exp $ HISTORY 20041004 14:45:43 HISTORY $Id: cir_ccdproc.c,v 1.9 2004/09/07 14:18:51 jim Exp $ HISTORY 20041004 22:52:54 HISTORY $Id: cir_imcore.c,v 1.11 2004/09/07 14:18:52 jim Exp $ HISTORY 20041004 22:52:56 HISTORY $Id: cir_platesol.c,v 1.9 2004/09/07 14:18:54 jim Exp $ HISTORY 20041005 16:05:06 HISTORY $Id: cir_imcore.c,v 1.11 2004/09/07 14:18:52 jim Exp $ HISTORY 20041006 07:31:07 HISTORY $Id: cir_platesol.c,v 1.9 2004/09/07 14:18:54 jim Exp $ HISTORY 20131220 22:36:15 HISTORY Headers updated by Geert Barentsen as part of DR2. HISTORY This included changes to MAGZPT, EXPTIME and the WCS. COMMENT Calibration info COMMENT ================ COMMENT The MAGZPT keyword in this header has been corrected for atmospheric COMMENT extinction and gain (PERCORR) and has been re-calibrated as part of DR2.COMMENT COMMENT Hence to obtain calibrated magnitudes relative to Vega, use: COMMENT mag(Vega) = MAGZPT - 2.5*log(pixel value / EXPTIME) END