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[TRES Data Processing] [Data Directories] [Reduced Data Keywords]
The following keywords are in the primary header of a raw TRES file:
| Keyword | Sample Value | Comment | Description | |
|---|---|---|---|---|
| SIMPLE | T | Primary FITS image array | ||
| BITPIX | 16 | Bits per pixel | IEEE single precision floating point | |
| NAXIS | 0 | Number of axes | Primary FITS extension contains no data | |
| EXTEND | T | File contains extensions | ||
| OBJECT | 'Vega' | OBJECT NAME | ||
| RA | '18:36:56.3' | MEAN RA | ||
| DEC | '+38:47:01.' | MEAN DEC | ||
| EPOCH | 2000 | MEAN EQUINOX | ||
| AIR | 1.07 | AIR MASS BY TELESCOPE | ||
| RRA | '18:36:56.3' | REQUESTED RA | ||
| RDEC | '+38:47:01.' | REQUESTED DEC | ||
| REPOCH | 2000 | REQUESTED EQUINOX | ||
| TRA | ' 18:36:54.943' | RA BY TELESCOPE | ||
| TDEC | ' 38:48:45.23' | DEC BY TELESCOPE | ||
| TEPOCH | 2000.000 | EPOCH BY TELESCOPE | ||
| ST | '20:15:17.50' | Telescope Sidereal Time at start of exposure | ||
| HA | ' 01:37:58.03' | Hour Angle hh:mm:ss at start of exposure | ||
| GFWHM | ' ' | GUIDE FWHM ARC SEC | ||
| SFOCUS | 2.0700 | TRES FOCUS FLOAT | ||
| PERI | 'OUT ' | Periscope position (IN or OUT) | ||
| COMPTIME | '0.0 ' | FLASH TIME (seconds) | ||
| FIBSIZE | '2.3 ' | TRES FIBER SIZE (arcseconds) | ||
| IODINE | 'OUT ' | IODINE POSITION | ||
| CTEMPS | ' -110.1C - 100% ' | Chip temperatures | ||
| BTEMPS | '23.491 23.610 -265.320 19.789' | Bench temperatures- BOT OPT HTR AC | ||
| PRES_HUM | '779.60 31.81 ' | Air Pressure and Rel Humidity | ||
| DATE-OBS | '2023-07-19T07:51:20' | UT date/time at start | ||
| UTOPEN | '07:51:20 ' | UT time at start | ||
| UTEND | '07:51:24 ' | UT time at end | ||
| MJD | 60144.327315 | MODIFIED JULIAN DATE | ||
| OBSERVER | 'P Berlind ' | Observer | ||
| P.I. | 'Latham ' | Principal Investigator | ||
| PROGRAM | '149 dwlmisc.mct ' | TRES Observing Program | ||
| OSSWITCH | ' NO ' | OBJECT/SKY SWAP (YES or NO) | ||
| SITENAME | 'flwo1' | Observatory name = FLWO 1.5 m | ||
| SITELONG | '+110:52:39.0' | Observatory longitude in degrees west of 0 ddd:mm:ss | ||
| SITELAT | '+31:40:51.4' | Observatory latitude in degrees dd:mm:ss | ||
| SITEELEV | 2320.0 | Observatory elevation in meters | ||
| DETECTOR | tres | DETECTOR ID | ||
| EXPTIME | 15.0000000000 | INTEGRATION TIME, SECONDS | ||
| DARKTIME | 5.000 | ELAPSED TIME, SECONDS | ||
| ADC | 'PA -103.6 A=336.4 B=176.4 HA= 01:33:9.524 defl=10.0 AD=226.1 BD=206.1' | ADC correction | ||
| CALPOS | 'Thar ' | LAMP SELECTED | ||
| PROJPOS | 'N/A ' | ARM POSITION | ||
| STAGEPOS | 'out ' | Calibration stage position (in or out) | ||
| IMAGETYP | 'OBJECT ' | IRAF TYPE KEY OBJECT FLAT COMP ZERO DARK | ||
| FIBKEY | 'OS ' | Fiber Decoding Object, Sky, Flat, Comp, Bias, Dark | ||
| RFN | '20230717.0044' | Reduced file number, [yyyymmdd.nnnn] | ||
| END | Last line of Primary Data Header | |||
The following keywords are in each of the headers of the two image extensions of a raw TRES file:
| Keyword | Sample Value | Comment | Description |
|---|---|---|---|
| SIMPLE | T | FITS data extension image array | |
| BITPIX | 16 | Bits per pixel | IEEE single precision floating point |
| NAXIS | 2 | Number of axes | |
| NAXIS1 | 545 | Number of pixels in cross-dispersion axis | |
| NAXIS2 | 2313 | Number of pixels in dispersion axis | |
| INHERIT | T | If T, inherit parameters from the primary FITS header | |
| BZERO | 32768.0000000 | True value = BSCALE * (BZERO + value) | |
| BSCALE | 1.0000000 | True value = BSCALE * (BZERO + value) | |
| EXTNAME | 'IM1 or IM2 ' | Name of this extension | |
| EXTVER | 1 | Extension version | |
| DETSIZE | '[1:2400,1:4800] ' | Unbinned detector amplifier size | |
| CCDSUM | '2 2 ' | Binning in X and Y during readout | |
| CD1_1 | -0.0001667 | Rotation Matrix | |
| CD1_2 | 0.0000000 | Rotation Matrix | |
| CD2_1 | 0.0000000 | Rotation Matrix | |
| CD2_2 | 0.0001667 | Rotation Matrix | |
| GAIN | 1.0800000 | Gain multiplier | |
| RDNOISE | 5.1100000 | Readout noise in counts | |
| NAMPS | 2 | Number of amplifiers (file extensions) | |
| DETSEC | '[334:1357,97:4704]' | Unbinned amp | |
| CCDSEC | '[1:1024,1:4608] ' | Unbinned amp size | |
| DATASEC | '[26:537,2:2305] ' | Binned amp data section | |
| BIASSEC | '[539:545,2:2313] ' | Binned amp bias section | |
| TRIMSEC | '[26:537,2:2305] ' | Raw image data section | |
| ORIGSEC | '[1:512,1:2304] ' | Binned amp after trimming | |
| LTM1_1 | 0.5000000 | First coordinate of first data pixel | |
| LTM2_2 | 0.5000000 | Second coordinate of first data pixel | |
| LTV1 | 25.2500000 | Raw first coordinate of first data pixel | |
| LTV2 | 1.2500000 | Raw second coordinate of first idata pixel | |
| RADECSYS | 'FK5 ' | Coordinate system | |
| DETECTOR | 'tres ' | Detector ID | |
| EXPTIME | 4.000 | Integration time in seconds | |
| END | Last line of each amplifier data header | ||