This table should contain only information about the MOS hardware. For the sake of convenience the column OBJ_PKEY is included. This denotes the object to which each fiber is assigned; however, inclusion of OBJ_PKEY denormalizes the schema of the tables as a database.
Detailed definitions of the FITS keywords used in this HDU are available in a data dictionary.
XTENSION= 'TABLE ' / ASCII table extension BITPIX = 8 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = xxx / number of chars needed to describe members NAXIS2 = xxx / number of fibers on the MOS PCOUNT = 0 / required FITS extension keyword GCOUNT = 1 / required FITS extension keyword TFIELDS = 11 / Number of columns in the table EXTNAME = 'MOS_Hardware' / This table describes a MOS Configuration EXTVER = 1 / Unique index of this Config table in file GRPID1 = 1 / member of group with EXTVER=1 in same file COMMENT Because GRPID1 is positive we need no GRPLC1 card DATE = 'yyyy-mm-ddThh:mm:ss.sssZ' / Date of construction of Config table COMMENT Various keywords related to the construction of the MOS COMMENT It could be argued that these should be in columns. BUTNDIAM= 0.006400 / [meter] HYPODIAM= 0.000900 / [meter] GYDBDIAM= 0.009000 / [meter] GYDFDIAM= 0.007000 / [meter] LEEWAY = 0.005000 / [meter] TPRIMKEY= 'PIVOTID' / Database Primary Key COMMENT In a relational sense this key should not be placed here. COMMENT Its presence permits the possibility of data that disagree. NFORKY = 1 / Number of foreign key joins described TFORKY1 = 'OBJ_PKEY' / Foreign key TFOREF1 = 'MOS_Input_Catalog' / some kind of reference to the other table TBCOL1 = xx / First character in column TFORM1 = 'I3 ' / Fortran 77 format of column TTYPE1 = 'PIVOTID ' / TBCOL2 = xx / First character in column TFORM2 = 'I3 ' / Fortran 77 format of column TTYPE2 = 'SLITID ' / TBCOL3 = xx / First character in column TFORM3 = 'A5 ' / Fortran 77 format of column TTYPE3 = 'FIBERID ' / TBCOL4 = xx / First character in column TFORM4 = 'I3 ' / Fortran 77 format of column TTYPE4 = 'FIBSTAT ' / TBCOL5 = xx / First character in column TFORM5 = 'I6 ' / Fortran 77 format of column TTYPE5 = 'OBJ_PKEY' / Key pointing into object table(s) TNULL5 = ' 0 ' / Indicates fiber not on any cataloged object TBCOL6 = xx / First character in column TFORM6 = 'F9.6 ' / Fortran 77 format of column TTYPE6 = 'PIV_POSX' / TUNIT6 = 'meter ' / Unit of measure of column TBCOL7 = xx / First character in column TFORM7 = 'F9.6 ' / Fortran 77 format of column TTYPE7 = 'PIV_POSY' / TUNIT7 = 'meter ' / Unit of measure of column TBCOL8 = xx / First character in column TFORM8 = 'F9.6 ' / Fortran 77 format of column TTYPE8 = 'PRK_POSX' / TUNIT8 = 'meter ' / Unit of measure of column TBCOL9 = xx / First character in column TFORM9 = 'F9.6 ' / Fortran 77 format of column TTYPE9 = 'PRK_POSY' / TUNIT9 = 'meter ' / Unit of measure of column TBCOL10 = xx / First character in column TFORM10 = 'F9.6 ' / Fortran 77 format of column TTYPE10 = 'HYPOLEN ' / TUNIT10 = 'meter ' / Unit of measure of column TBCOL11 = xx / First character in column TFORM11 = 'F7.3 ' / Fortran 77 format of column TTYPE11 = 'ANGMAX ' / TUNIT11 = 'degree ' / Unit of measure of column ENDThe header is padded with ASCII blanks such that it consists of a positive integer multiple of 2880 bytes (36 card images of 80 characters).
The value of the keyword EXTNAME deserves further scrutiny.
Other kinds of FITS groups for MOS data may become desirable; e.g.,
groups which relate calibration exposures to sky exposures. It may
also be desirable to insert other kinds of documentary data using
additional standard and/or MOS-specific keywords. The DATE
keyword presents an obvious problem as we enter a new century, but
the FITS community has not yet developed an alternative scheme.