FITS Headers
DIRBE_DCAFINDEX_P3B_FACE0.FITS
Primary Header
SIMPLE = T / file does conform to FITS standard BITPIX = 32 / number of bits per data pixel NAXIS = 0 / number of data axes EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format defined in Astronomy and COMMENT Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365. COMMENT Contact the NASA Science Office of Standards and Technology for the COMMENT FITS Definition document #100 and other FITS information. DATE = '09/04/97' / FITS file creation date (dd/mm/yy) DATE-MAP= '04/04/96' / Date of original file creation (dd/mm/yy) ORIGIN = 'CDAC ' / Cosmology Data Analysis Center TELESCOP= 'COBE ' / Cosmic Background Explorer satellite INSTRUME= 'DIRBE ' / COBE instrument [DIRBE, DMR, FIRAS] OBJECT = 'FACE0 ' / part of sky given [e.g., ALL-SKY, WEEKLY-SKY, COMMENT / DAILY-SKY, GAL-SLICE, FACE ...] EQUINOX = 2000.0 / equinox of coords in following tables REFERENC= 'COBE/DIRBE Explanatory Supplement,' / REFERENC= 'ed. M.G. Hauser, T. Kelsall, D. Leisawitz, and J. Weiland,' / REFERENC= 'COBE Ref. Pub. No. 97-A (Greenbelt,MD: NASA/GSFC),' / REFERENC= 'available in electronic form from the NSSDC.' / COMMENT COMMENT COBE specific keywords DATE-BEG= '11/12/89' / date of initial data represented (dd/mm/yy) DATE-END= '21/09/90' / date of final data represented (dd/mm/yy) PIXRESOL= 9 / Quad tree pixel resolution [6, 9] COMMENT COMMENT DIRBE specific keywords PRODUCT = 'DCAFINDEX_F0' / Pixel Index file for DCAF, Face 0 VERSION = 'Pass 3B ' / Version of Data Reduction Software COMMENT COMMENT END
Extension Header 2
XTENSION= 'BINTABLE' / Extension type is Binary Table BITPIX = 8 / Binary data NAXIS = 2 / Data are in a table NAXIS1 = 14 / Number of 8 bit bytes in each row NAXIS2 = 65536 / Number of rows PCOUNT = 0 / Number of bytes of data following table GCOUNT = 1 / Group count (always 1 for bintable extensions) TFIELDS = 3 / Number of fields (columns) in the table COMMENT COMMENT COMMENT ------------------------------------------------------------------- COMMENT ******************************************************************* COMMENT DIRBE Calibrated Annual File, Face 0 : Pixel Index COMMENT COMMENT This is the companion pixel index to the DIRBE COMMENT Calibrated Annual File (DCAF) for Face 0 of the COBE COMMENT Quadrilateralized Spherical Cube: i.e., the index to DCAF COMMENT data tabulated for DIRBE pixel numbers 0 - 65535. COMMENT The pixel index is intended to simplify and expedite data COMMENT retrieval for a user-selected subset of pixels in the COMMENT DCAF. There is one row in the index table for each DIRBE COMMENT pixel (resolution 9) on the cube face. Pixels are listed COMMENT in ascending order. For each pixel, the pixel index COMMENT table gives the number of the LAST row within the COMMENT corresponding DCAF table which contains observations for COMMENT that pixel, and specifies which mission weeks contain COMMENT observations for that pixel. COMMENT ******************************************************************* COMMENT ------------------------------------------------------------------- COMMENT =================================================================== COMMENT Coordinate Information (Spatial): COMMENT =================================================================== COMMENT ------------------------------------------------------------------- COMMENT DIRBE Pixel number (resolution 9) TTYPE1 = 'Pixel_no' / pipeline fieldname = Pixel_no TUNIT1 = ' ' / TFORM1 = '1J ' / COMMENT --------------------------------------------------------------------- COMMENT =================================================================== COMMENT Pixel Indexing Information: COMMENT =================================================================== COMMENT ------------------------------------------------------------------- COMMENT Number of the last row within the corresponding DCAF COMMENT binary table which contains information for this pixel number. COMMENT Row numbers are counted starting at 1. COMMENT TTYPE2 = 'LastRow ' / pipeline fieldname = last_data_record TUNIT2 = ' ' / TFORM2 = '1J ' / COMMENT -------------------------------------------------------------------- COMMENT Mission week numbers for which data are available on this COMMENT pixel. Stored as a 6 byte (48 bit) vector, where each bit COMMENT corresponds to a specific week number in the mission. COMMENT Bit numbers start with 0 as the LSB in byte 1, 8 as the COMMENT LSB in byte 2, etc., and are related to mission week COMMENT numbers as follows: COMMENT Week number = bit number + 4 COMMENT Thus, for example, if the LSB in byte 3 is set to 1, then COMMENT data are available for mission week 20. Week numbers range COMMENT from 4 to 44. A list of week numbers and their corresponding COMMENT times is provided in the Explanatory Supplement. COMMENT TTYPE3 = 'WksObs ' / pipeline fieldname = weeks_observed TUNIT3 = ' ' / TFORM3 = '6B ' / TDIM3 = '(6) ' / COMMENT -------------------------------------------------------------------- END
