General description: This file contains raw spectro data from the spectro CCDs. Simultaneous frames in different chips all have the same frame number. Which frames are what type of observation is indicated by the FLAVOR keyword in each header. HDU 0 contains the raw counts as integers (2128x2069). This description applies to old SDSS-I,-II raw spectro data. For current BOSS spectro data, see BOSS sdR files.
Naming convention: sdR-[br][12]-[FRAME].fit, indicating which blue or red spectrograph (1 or 2), and the frame number.
Approximate size: 8815680 bytes.
File type: FITS
Read by products: ???
Written by products: ???
Example header:
SIMPLE = F / FIT STANDARD BITPIX = 16 / FITS BITS/PIXEL NAXIS = 2 / NUMBER OF AXES NAXIS1 = 2128 / WIDTH (TOTAL!) NAXIS2 = 2069 / HEIGHT (TOTAL!) SDSS / THIS HEADER CONTAINS SPECIAL SDSS KEYWORDS UNSIGNED / UNSIGNED DATA - NO BSCALE OR BZERO KEYWORDS TAI = 4709606631.06 / 1st row Number of seconds since Nov 17 1858 RA = 173.99963 / 1st row RA of telescope boresight (deg) DEC = -0.000071 / 1st row Dec of telescope boresight (degrees) SPA = 0.045 / 1st row Cam col position angle wrt N (deg) IPA = 23.651 / 1st row Inst rotator position angle (deg) IPARATE = -0.0052 / 1st row Inst rotator anglr velocity (deg/sec) AZ = 28.416100 / 1st row Azimuth (encoder) of tele (0=N?) (deg) ALT = 53.721029 / 1st row Altitude (encoder) of tele (degrees) FOCUS = 95.000000 / 1st row - Focus piston (microns?) DATE-OBS= '2008-02-13' / 1st row - TAI date TAIHMS = '08:03:51.05' / 1st row TAI time HH:MM:SS.SS DATASUM = '2974642878' / Data checksum created 2008-02-13T08:04:49 CHECKSUM= 'MEXaNCWXMCWaMCWW' / HDU checksum created 2008-02-13T08:04:49 TIMESYS = 'tai ' / TAI, not UTC TAI-BEG = 4.70960504800000E+09 / Exposure Start Time TAI-END = 4.70960657700000E+09 / Exposure End Time MJD = 54509 / MJD of observation VERSION = 'v4_38_0 ' / version of IOP CAMVER = 'SPEC1 v4_8' / Camera code version OBSERVER= 'kpan ' OBSCOMM = 'science ' TELESCOP= 'SDSS 2-5m' SEQID = 49976 / Spectro sequence number, unique over EXPOSURE= 49979 / Spectro exposure number, unique over EXPTIME = 1.50000000000000E+03 / Exposure time. (seconds) DARKTIME= 1.52900000000000E+03 / Time between flush charge and read-ou FLAVOR = 'target ' / Flavor of this sequence (e.g., dome f QUALITY = 'excellent' / night/image quality RADEG = 1.74000000000000E+02 / Right Ascension. (degrees) DECDEG = 0.00000000000000E+00 / Declination. (degrees) PLATEID = 2877 / Plate Id TILEID = 8400 / Tile Id CARTID = 3 / Cartridge Id REDDEN = '0 0 0 0 0' / Median reddening vector for plate MAPID = 5450801 / Map Id NAME = '2877-54508-01' / Name of target; PlateId-MJD-Mapper Re PLUGMAPO= '/data/spectro/plugMapM/plPlugMapM-2877-54508-01.par' / plPlugMap load CAMERAS = 'r1 ' / camera ID in this exposure CAMCOL = 4 / CCD ID in this exposure COLBIN = 1 / Binning factor perpendicular to the c ROWBIN = 1 / Binning factor perpendicular to the r PROGRAM = 'binning 1 1 ' / Identifying name for CCD program AMPLL = 0 / which amp 0,1,2,3 corresponds to low AMPLR = 2 / which amp 0,1,2,3 corresponds to low AMPUL = 1 / which amp 0,1,2,3 corresponds to high AMPUR = 3 / which amp 0,1,2,3 corresponds to high SECFOCUS= 9.50000000000000E+01 / Secondary Mirror Position as reported GUIDEIMG= '/data/spectro/guider/gimg1011.fits' / Last archived guider image WTIME = 1.20288970700000E+09 / weatherData(timeStamp) AIRTEMP = 7.00000000000000E-01 / weatherData(airtemp) DEWPOINT= -9.8000000000000E+00 / weatherData(dewpoint) DEWDEP = 1.04000000000000E+01 / weatherData(dewpointDep) DUSTA = 1.39770000000000E+04 / weatherData(dusta) DUSTB = 2.91000000000000E+02 / weatherData(dustb) DUSTC = 7.68200000000000E+03 / weatherData(dustc) DUSTD = 1.21000000000000E+02 / weatherData(dustd) GUSTD = 9.40000000000000E+00 / weatherData(gustd) GUSTS = 1.48000000000000E+01 / weatherData(gusts) HUMIDITY= 4.54000000000000E+01 / weatherData(humidity) HUMIDOUT= 4.50000000000000E+01 / weatherData(humidout) PRESSURE= 2.14280000000000E+01 / weatherData(pressure) WINDD = 1.43000000000000E+01 / weatherData(windd) WINDS = 1.18000000000000E+01 / weatherData(winds) MC1HUMHT= 3.02000000000000E+01 / sp1 mech hartmann humidity MC1HUMCO= 2.77000000000000E+01 / sp1 mech cen opt humidity MC1TEMDN= 2.40000000000000E+00 / sp1 mech median temp MC1THT = 2.10000000000000E+00 / sp1 mech Temp_Hartmann_Top MC1TRCB = 2.00000000000000E+00 / sp1 mech Temp_Red_Cam_Bot MC1TRCT = 2.90000000000000E+00 / sp1 mech Temp_Red_Cam_Top MC1TBCB = 2.60000000000000E+00 / sp1 mech Temp_Blue_Cam_Bot MC1TBCT = 2.40000000000000E+00 / sp1 mech Temp_Blue_Cam_Top MC2HUMHT= -2.4500000000000E+01 / sp2 mech hartmann humidity MC2HUMCO= 2.59000000000000E+01 / sp2 mech cen opt humidity MC2TEMDN= 1.10000000000000E+00 / sp2 mech median temp MC2THT = 1.70000000000000E+00 / sp2 mech Temp_Hartmann_Top MC2TRCB = 1.70000000000000E+00 / sp2 mech Temp_Red_Cam_Bot MC2TRCT = 1.10000000000000E+00 / sp2 mech Temp_Red_Cam_Top MC2TBCB = 1.10000000000000E+00 / sp2 mech Temp_Blue_Cam_Bot MC2TBCT = 1.50000000000000E+00 / sp2 mech Temp_Blue_Cam_Top FFS = '0 0 0 0 0 0 0 0' / FlatField Screen 1:closed 0:open FF = '0 0 0 0 ' / FlatField Lamps 1:on 0:off NE = '0 0 0 0 ' / Ne Lamps 1:on 0:off HGCD = '0 0 0 0 ' / Hgcd Lamps 1:on 0:off SPEC1 = '1 0 1 1 ' / Dr_opn Dr_cls Latch Slithead (1:inpla SPEC2 = '1 0 1 1 ' / Dr_opn Dr_cls Latch Slithead (1:inpla TEMP01 = -9.3750000000000E+01 / CCD 01 Temperature TEMP02 = -9.3750000000000E+01 / CCD 02 Temperature TEMP03 = -9.2970000000000E+01 / CCD 03 Temperature TEMP04 = -9.2970000000000E+01 / CCD 04 Temperature