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| Keyword | Sample Value | Comment | Description | |
|---|---|---|---|---|
| SIMPLE | T | Fits standard | ||
| BITPIX | -32 | Bits per pixel | -32 = 4-byte floating point | |
| NAXIS | 2 | Number of axes | ||
| NAXIS1 | 2673 | Axis length | dispersion axis | |
| NAXIS2 | 70 | Axis length | 1=spectrum, 2=sky+spectrum,3=sky | |
| EXTEND | F | File may contain extensions | ||
| ORIGIN | 'NOAO-IRAF FITS Image Kernel July 2003' | FITS file originator | ||
| DATE | '2006-03-01T15:19:47' | Date FITS file was generated | ||
| IRAF-TLM | '10:19:46 (01/03/2006)' | Time of last modification | ||
| COMMENT | FITS (Flexible Image Transport System) formt is defined in 'Astronomy | |||
| COMMENT | and Astrophysics',volume 376, page 359; bibcode: 2001A&A...376..3559H | |||
| OBJECT | '2M07073657+4602435' | SET BY COMMENT FILE | ||
| RA | '07:07:36.58' | MEAN RA | ||
| DEC | '46:02:43.4' | MEAN DEC | ||
| EPOCH | 2000 | MEAN EQUINOX | ||
| ROTANGLE | '090 ' | ROT ANGLE | ||
| FASTFOC | '970 ' | FAST FOCUS | ||
| RRA | '07:07:36.58' | REQUESTED RA | ||
| RDEC | '46:02:43.4' | REQUESTED DEC | ||
| REPOCH | 2000 | REQUESTED EQUINOX | ||
| TRA | '07:07:42.1 | RA BY TELESCOPE | ||
| TDEC | '+46:01:57.0 | DEC BY TELESCOPE | ||
| TEPOCH | 2000.000 | EPOCH BY TELESCOPE | ||
| HA | '+02:19:08' | HA BY TELESCOPE | ||
| DATE-OBS | '2006-03-01' | UT YYY-MM-DD AT START OF EXPOSURE | ||
| UT | '06:03:16' | UT HH:MM:SS AT START OF EXPOSURE | ||
| UTEND | '06:15:17' | UT HH:MM:SS AT END OF EXPOSURE | ||
| AIRMASS | 1.16 | AIR MASS BY TELESCOPE | ||
| ST | '09:27:23' | TELESCOPE SIDEREAL TIME AT END | ||
| EXPTIME | 720.004 | INTEGRATION TIME, SECONDS | ||
| GJDN | 2453795.75645 | TOPCENTRIC JULIAN DAY AT MIDDLE OF EXPOSURE | ||
| HJDN | 2453795.75925 | HELIOCENTRIC JULIAN DAY AT MIDDLE OF EXPOSURE | ||
| GAIN | 1.20 | Gain(1), electrons per ADU, set by parameters | ||
| RDNOISE | 8.6 | Read Noise(1), electrons, set by parameters | ||
| RAMPROG0 | 'serial parallel skip 99 repeat 80 add 4 end skip 93 repeat 8' | |||
| RAMPROG0 | 'add 4 end' | |||
| OBSERVAT | 'FLWO1 ' | IRAF TYPE KEY | ||
| DISPAXIS | 1 | IRAF TYPE KEY | ||
| IMAGETYP | 'OBJECT ' | IRAF TYPE KEY | object, flat, bias, dark. | |
| OBSERVER | 'P BERLIND ' | observer(s) | ||
| P.I. | 'Huchra ' | Principal Investigator Name | ||
| PROGRAM | '#141 Mapping the Nearby Univserse ' | Program Name | ||
| APERTURE | '3 ' | arcsec | ||
| DISPERSE | '300 ' | gratting (lines/mm) | ||
| TILTPOS | '600 ' | tilt position | ||
| LOGNAME | 'perry ' | LOGIN NAME | ||
| INSTRUME | 'FAST ' | instrument name | ||
| DETECTOR | 'thin_01 ' | detector identifier | ||
| DRBUFOVF | 0 | INPUT FIFO OVERLFOW - NON-ZERO = BAD DATA! | ||
| SITENAME | 'flwo1' | |||
| SITELONG | '+110:52:39.0' | LONGITUDE, DEGREES WEST OF ZERO | ||
| SITELAT | '+31:40:51.4' | LATITUDE, DEGREES | ||
| SITEELEV | 2320.0 | ELEVATON, METERS | ||
| TELESCOP | 'TILLINGHAST' | 1.5 m (60 inch) telescope | ||
| DISKDIR | '/fast/flwo1/2006/02/28' | ORIGINAL RAW DIRECTORY | ||
| DISKFILE | 61 | FILE NO. IN ORIGINAL RAW DIRECTORY | ||
| COMMENT | Object: 2M07073657+4602435 | |||
| COMMENT | Observer: P Berlind | |||
| COMMENT | P.I.: Huchra | |||
| COMMENT | Program: #141 Mapping the Nearby Universe | |||
| COMMENT | Seeing: 1-2" | |||
| COMMENT | Aperture: 3 | |||
| COMMENT | Disperse: 300 | |||
| COMMENT | Tiltpos: 600 | |||
| COMMENT | Comment: | |||
| COMMENT | Focus: 970 | |||
| COMMENT | Clouds: lost all over | |||
| FINDOBJ | '38:44' | |||
| FINDBACK | '10:35,48:57,63:70' | from Quicklook - may or may not be present | ||
| FINDSPEC | ' procdata.findspec 2.2a 28-Feb-2006 23:15 obj = 38:44' | from Quicklook - may or may not be present | ||
The following keywords are added by image data reduction tasks:
| WCSDIM | 3 | Number of WCS dimensions | |
| LTM1_1 | 1. | see note 1 | |
| LTM1_2 | 1. | see note 1 | |
| WAT0_001 | 'system=equispec' | IRAF WCS | |
| WAT1_001 | 'wtype-linear label=Wavelength units=angstroms' | IRAF WCS | |
| WAT2_001 | 'wtype-linear' | IRAF WCS | |
| FIXPIX | 'Mar 1 10:19 Bad pixel file is badpix4.pl' | ||
| CCDSEC | '[5:2677,6:75]' | data section after image trimmed | |
| CCDMEAN | 73.21655 | ||
| CCDMEANT | 825675586 | ||
| CCDPROC | 'Mar 1 10:19 CCD processing done' | ||
| TRIM | 'Mar 1 10:19 Trim data section is [5:2677,6:75]' | ||
| OVERSCAN | 'Mar 1 10:19 Overscan section is [2695:2717,1:81] with mean=645.9997' | ||
| ZEROCOR | 'Mar 1 10:19 Zero level correction image is zero' | ||
| FLATCOR | 'Mar 1 10:19 Flat field image is norm with scale=1' | ||
| DCLOG1 | 'Transform' | Reference wavelength calibration spectrum | |
| DC-FLAG | 0 | Wavelength axis is linear, not log wavelength | |
| CTYPE1 | 'LINEAR ' | X-axis WCS is linear | |
| CTYPE2 | 'LINEAR ' | Y-axis WCS is linear | |
| CRVAL1 | 3476.54223632812 | WCS (wavelength) value at X-axis reference pixel | |
| CRPIX1 | 1. | X-axis WCS (wavelength) reference pixel | |
| CD1_1 | 1.46894121170044 | X-axis WCS units (Angstroms) per pixel | |
| CD2_2 | 1. | Y-axis WCS units (spectra) per pixel | |
| HISTORY | procdata.findspec 2.2a 28-Feb-2006 23:15 obj = 38:44 | ||
| BANDID1 | 'spectrum - background fit, weights variance, clean yes' | ||
| BANDID2 | 'raw - background fit, weights none, clean no' | ||
| BANDID3 | 'background - background fit' | ||
| BANDID4 | 'sigma - background fit, weights variance, clean yes' | ||
| APNUM1 | '1 0 32.00 39.00' | ||
| CTYPE3 | 'LINEAR ' | ||
| CD3_3 | 1. | ||
| LTM3_3 | 1. | ||
| WAT3_001 | 'wtype=linear' | ||
| VELOCITY | 5682.95229569052 | Best redshift velocity in km/sec | |
| Z | 0.0189562857499454 | Best redshift | |
| CZERR | 29.7334202046412 | Redshift velocity error in km/sec | |
| ZERR | 9.91800001822634E-5 | Redshift error | |
| VELQUAL | 'Q ' | Velocity quality (_=not set, Q=good, X=bad, ?=uncertain) from rvsao.qplot | |
| BCV | -23.281608581543 | Barycentric velocity correction in km/sec from rvsao.xcsao | |
| CZXC | 5682.95229569052 | Best cross-correlation redshift velocity in km/sec from rvsao.xcsao | |
| ZXC | 0.0189562857499454 | Best cross-correlation redshift from rvsao.xcsao | |
| CZXCERR | 25.6724809293096 | Best cross-correlation redshift velocity error in km/sec from rvsao.xcsao | |
| CZXCR | 9.95683609617909 | Best cross-correlation redshift R-value from rvsao.xcsao | |
| BESTTEMP | 'fabtemp97' | Name of best cross-correlation template file from rvsao.xcsao | |
| CZPARAMS | '7 4096 1 5 20 250 500 0.05' | rvsao.xcsao parameters: number of templates, number of log-wavelength pixels, zpad flag, 4 filter limits, apodization | |
| XCTEMP1 | 'fabtemp97 5682.952 25.672 9.95684 0.455 368.727 5710.612 0.000 yes 0' | ||
| XCTEMP2 | 'ztemp 5657.932 23.931 7.62014 0.350 271.526 5683.628 0.000 yes 1' | ||
| XCTEMP3 | 'femtemp97 5681.463 16.106 7.84364 0.311 189.606 5705.060 0.000 no 3' | ||
| XCTEMP4 | 'fs2temp 5688.228 29.451 6.97068 0.384 308.778 5712.022 0.000 yes 0' | ||
| XCTEMP5 | 'fglotemp 5687.937 33.178 6.64375 0.403 333.615 5714.514 0.000 yes 0' | ||
| XCTEMP6 | 'fm32temp 5691.932 33.021 7.05591 0.404 349.376 5718.735 0.000 yes 0' | ||
| XCTEMP7 | 'fn7331temp 5662.130 31.278 7.37931 0.399 344.429 5673.537 0.000 yes' | ||
| XCSAO | 'rvsao.xcsao 2.4.8 01-Mar-2006 10:43 CZXC = 5682.95 R = 9.96' | ||
| QPLOT | 'rvsao.xcsao 2.4.8 01-Mar-2006 10:43 VELOCITY = 5682.95 Q = Q' | ||
| COMMENT | 19 blank lines | ||
| END | |||
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Note 1 The image coordinate system (Ic,Il) refers to the recorded image pixel array. The image array may include other information such as overscan and prescan. Thus the actual data pixels from the CCD may occupy only a region of the image. However the image coordinate system begins with (1,1) for the first pixel in the image. The first data pixel will begin with some coordinate (Ic1,Il1). The data pixels then increment by one for each "binned" pixel. As with the amplifier coordinate system the general linear coordinate transformation between the CCD and image coordinates is given by: Ic = LTM1_1 * Cx + LTM1_2 * Cy + LTV1 Il = LTM2_1 * Cx + LTM2_2 * Cy + LTV2 Cx = ( LTM2_2 * (Ic - LTV1) - LTM1_2 * (Il - LTV2)) / (LTM1_1 * LTM2_2 - LTM1_2 * LTM2_1) Cy = (-LTM2_1 * (Ic - LTV1) + LTM1_1 * (Il - LTV2)) / (LTM1_1 * LTM2_2 - LTM1_2 * LTM2_1) | |||