General description: This file contains raw spectro data from the BOSS 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 (4352x4224).
Naming convention: sdR-[br][12]-[FRAME].fit, indicating which blue or red spectrograph (1 or 2), and the frame number.
Approximate size: 36771840 bytes.
File type: FITS
Read by products:
idlspec2d, sdssproc.pro
Written by products: ???
The overscan regions for each amplifier are currently hardcoded in
sdssproc. They are (in IDL slice notation):
| data[ 119:2175, 48:2111] | bias[ 10:100, 48:2111] |
| data[2176:4232, 48:2111] | bias[4250:4340, 48:2111] |
| data[ 119:2175, 2112:4175] | bias[ 10:100, 2112:4175] |
| data[2176:4232, 2112:4175] | bias[4250:4340, 2112:4175] |
| data[ 128:2175, 56:2111] | bias[ 10:67, 56:2111] |
| data[2176:4223, 56:2111] | bias[4284:4340, 56:2111] |
| data[ 128:2175, 2112:4167] | bias[ 10:67, 2112:4167] |
| data[2176:4223, 2112:4167] | bias[4284:4340, 2112:4167] |
Fiber 1 is on the left with wavelengths running up. MJD<55113 have images rotated 180 degrees.
SIMPLE = T / conforms to FITS standard BITPIX = 16 / array data type NAXIS = 2 / number of array dimensions NAXIS1 = 4352 NAXIS2 = 4224 BSCALE = 1 BZERO = 32768 EXTEND = T TELESCOP= 'SDSS 2-5m' FILENAME= 'sdR-r1-00103239.fit' CAMERAS = 'r1 ' EXPOSURE= 103239 DAQVER = '1.2.7 ' CAMDAQ = '1.2.0:28' ERRCNT = 'NONE ' SYNCERR = 'NONE ' SLINES = 'NONE ' PIXERR = 'NONE ' PLINES = 'NONE ' FLAVOR = 'arc ' / exposure type, SDSS spectro style FF = '0 0 0 0 ' / FF lamps 1:on 0:0ff NE = '1 1 1 1 ' / NE lamps 1:on 0:0ff HGCD = '1 1 1 1 ' / HGCD lamps 1:on 0:0ff FFS = '1 1 1 1 1 1 1 1' / Flatfield Screen 1:closed 0:open RA = 346.0 / RA of telescope boresight (deg) DEC = 0.0 / Dec of telescope boresight (deg) AZ = 42.223 / Azimuth axis position (deg) ALT = 49.077 / Altitude axis position (deg) IPA = 214.347 / Rotator position (deg) FOCUS = 300.0 / User-specified focus offset (um) NAME = '3564-55145-01' / The name of the currently loaded plate PLATEID = 3564 / The currently loaded plate CARTID = 11 / The currently loaded cartridge MAPID = 1 / The mapping version of the currently loaded pla POINTING= 'A ' / The currently specified pointing MJD = 55146 / APO MJD day at start of exposure TAI-BEG = 4764618153.0 / MJD(TAI) seconds at start of exposure DATE-OBS= '2009-11-11T01:02:33' / TAI date at start of exposure COLLA = 23783 / The position of the A collimator motor COLLB = 23721 / The position of the B collimator motor COLLC = 23769 / The position of the C collimator motor HARTMANN= 'Left ' / Hartmanns: Left,Right,Out,Both,Invalid,Unknown EXPTIME = 4.892613983154297 / exposure time DATASUM = '0000000000000000' COMMENT sp1red cards follow END