FITS Headers
DIRBE_BAND2A_ZSMA.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 = '29/05/97' / FITS file creation date (dd/mm/yy) DATE-MAP= '28/07/96' / 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 = 'ALL-SKY ' / 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 = 'B2A_ZSMA' / Band 2A map after IPD Model removal VERSION = 'Pass 3B ' / Version of Data Reduction Software WAVE2 = '2.2 microns' / nominal wavelength of Band 2 SOLELONG= '68-120 degrees' / only solar elongations in the range COMMENT / [68,120] degrees are utilized APPVEC = 'COMBINED' / data having different approach vectors COMMENT / are combined during processing ZLREMOV = T / zodiacal foreground removal indicator COMMENT / if 'T(rue)', zodi foreground has been removed COMMENT / if 'F(alse)', observed sky brightness is given ZLMODEL = 'FD6 ' / Version of DIRBE IPD Model 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 = 17 / Number of 8 bit bytes in each row NAXIS2 = 393216 / Number of rows PCOUNT = 0 / Number of bytes of data following table GCOUNT = 1 / Group count (always 1 for bintable extensions) TFIELDS = 5 / Number of fields (columns) in the table COMMENT COMMENT COMMENT ------------------------------------------------------------------- COMMENT ******************************************************************* COMMENT Zodi-Subtracted Mission Average (ZSMA) Skymap -- 2.2 microns COMMENT COMMENT This map represents the extra-Solar system sky brightness COMMENT at 2.2 microns. It is the average residual map that COMMENT results after the modelled interplanetary dust (IPD) signal COMMENT is subtracted from each of the DIRBE Weekly Skymaps COMMENT from the cryogenic mission. Individual weekly residual maps COMMENT can be reconstructed from the data supplied in the COMMENT DIRBE Sky and Zodi Atlas (DSZA). COMMENT COMMENT Not all of the available weekly residuals were used in the COMMENT construction of the mission averaged residual map. COMMENT The following relatively low-quality data were excluded: COMMENT 1) mission week 04 (89345 - 89351), band 8 COMMENT 2) mission week 24 (90120 - 90126), bands 1-8 COMMENT 3) mission weeks 39 & 40 (90225 - 90238), bands 1-8 COMMENT 4) data taken near solar elongation extrema COMMENT (solelong .GT. 120 .AND. solelong .LT. 68) COMMENT COMMENT COMMENT 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 DIRBE Sky Brightness Information: COMMENT =================================================================== COMMENT ------------------------------------------------------------------- COMMENT Mean Residual Intensity after removal of IPD Model, Band 2A. COMMENT The residual photometry reported here is the unweighted COMMENT average of NumWks weekly zodi-subtracted residuals, COMMENT as derived from the Photomet and ZL fields supplied in COMMENT the DIRBE Sky and Zodi Atlas (DSZA). COMMENT The mission-averaged residuals are given as COMMENT spectral intensities, I(nu) in MJy/sr, and COMMENT are quoted at the nominal wavelength COMMENT for a source with nu*I(nu) = constant -- i.e., COMMENT a color correction is required if the source COMMENT spectrum differs from nu*I(nu) = constant. COMMENT Data which have been replaced by flagged values COMMENT in processing have values .LE. -16375. TTYPE2 = 'Resid ' / pipeline fieldname = resid TUNIT2 = 'MJy/sr ' / TFORM2 = '1E ' / COMMENT -------------------------------------------------------------------- COMMENT Total number of individual 1/8th second observations COMMENT contributing to the mission-averaged residual. Computed COMMENT as the sum of all weekly weighted numbers of observations COMMENT (WtNumObs) used in computing the average. Values of COMMENT WtNumObs are tabulated in the DSZA product. COMMENT Range = [0,600] TTYPE3 = 'NumObs ' / pipeline fieldname = nobs TUNIT3 = ' ' / TFORM3 = '1J ' / COMMENT --------------------------------------------------------------------- COMMENT The number of weekly-averaged residuals used in computing COMMENT the mission-averaged residual. This number varies with COMMENT sky location. COMMENT Range = [0,41] TTYPE4 = 'NumWks ' / pipeline fieldname = nrec TUNIT4 = ' ' / TFORM4 = '1B ' / COMMENT --------------------------------------------------------------------- COMMENT Standard Deviation of the mean residual intensity, computed COMMENT from the deviation of individual weekly residuals COMMENT from the mission-averaged residual. COMMENT TTYPE5 = 'StdDev ' / pipeline fieldname = sigma_resid TUNIT5 = 'MJy/sr ' / TFORM5 = '1E ' / COMMENT ------------------------------------------------------------------- END
