FITS Headers
dmr_cio_91356_92021.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 See "Definition of the Flexible Image Transport System (FITS),"
COMMENT NASA/Science Office of Standards and Technology document 100-1.1 for
COMMENT a full description of the data format. The document is available at
COMMENT the FITS Support Office web site:
COMMENT http://www.gsfc.nasa.gov/astro/fits/fits_home.html
DATE = '19/12/98' / FITS file creation date (dd/mm/yy)
COMMENT
COMMENT FITS optional reserved keywords:
ORIGIN = 'CDAC ' / Cosmology Data Analysis Center
TELESCOP= 'COBE ' / Cosmic Background Explorer satellite
INSTRUME= 'DMR ' / Differential Microwave Radiometers
REFERENC= 'http://www.gsfc.nasa.gov/astro/cobe/cobe_home.html' /
COMMENT Other related references:
COMMENT 'C.L.Bennett, et al., 1996, APJ, 464, L1.'
COMMENT 'A.Kogut, et al., 1996, APJ, 470, 653.'
COMMENT 'G.F.Smoot, et al., 1992, APJ, 396, L1.'
COMMENT 'C.L.Bennett, et al., 1992, APJ, 396, L7.'
COMMENT 'E.L.Wright, et al., 1992, APJ, 396, L13.'
COMMENT 'A.Kogut, et al., 1992, APJ, 401, 1.'
COMMENT 'C.L.Bennett, et al., 1992, APJ, 391, 466.'
COMMENT 'G.F.Smoot, et al., 1990, APJ, 360, 685.'
COMMENT 'M.A.Janssen and S.Gulkis, 1992, in "The Infrared and Submillimeter
COMMENT Sky after COBE", eds. M.Signore and C.Dupraz (Dordrecht: Kluwer).'
COMMENT
COMMENT COBE/DMR specific keywords
VERSION = 'PASS 3 ' / Version of Data Reduction Software
TEMPTYPE= 'ANTENNA ' / Scale used for temperature fields,
COMMENT / one of 'ANTENNA ' or 'THERMO '
COMMENT The thermodynamic and antenna temperature scales are related by
COMMENT a frequency-dependent factor corresponding to the deviation of the
COMMENT Rayleigh-Jeans law from the Planck function. See DMR calibration
COMMENT paper (Bennett et.al., 1992, APJ, 391, 466) for details.
FREQ1 = 3.15E+10 / Frequency (Hz) at which Channel 31A data taken
FREQ2 = 3.15E+10 / Frequency (Hz) at which Channel 31B data taken
FREQ3 = 5.30E+10 / Frequency (Hz) at which Channel 53A data taken
FREQ4 = 5.30E+10 / Frequency (Hz) at which Channel 53B data taken
FREQ5 = 9.00E+10 / Frequency (Hz) at which Channel 90A data taken
FREQ6 = 9.00E+10 / Frequency (Hz) at which Channel 90B data taken
COMMENT / Also used to define conversion from antenna
COMMENT / to thermodynamic temperature
PLNK1 = 1.025724 / Thermodynamic temperature (31A) =
COMMENT / PLNK1 * antenna temperature (31A)
PLNK2 = 1.025724 / Thermodynamic temperature (31B) =
COMMENT / PLNK2 * antenna temperature (31B)
PLNK3 = 1.074197 / Thermodynamic temperature (53A) =
COMMENT / PLNK3 * antenna temperature (53A)
PLNK4 = 1.074197 / Thermodynamic temperature (53B) =
COMMENT / PLNK4 * antenna temperature (53B)
PLNK5 = 1.225941 / Thermodynamic temperature (90A) =
COMMENT / PLNK5 * antenna temperature (90A)
PLNK6 = 1.225941 / Thermodynamic temperature (90B) =
COMMENT / PLNK6 * antenna temperature (90B)
DATE-BEG= '22/12/91' / Data set start date
JSTART = '91356000004000' / Start time YYDDDHHMMSSHHH
DATE-END= '20/01/92' / Data set stop date
JSTOP = '92020235932000' / Stop time YYDDDHHMMSSHHH
COMMENT DATE-BEG and DATE-END give the dates during which
COMMENT the earliest and the latest data used in this product
COMMENT were obtained.
COMMENT JSTART and JSTOP delimit in a form expected by COBE software
COMMENT the interval of time during which the data used
COMMENT in this product were obtained.
BASELINE= 'MEAN ' / Baseline used
COR_MAGS= T / If "T", magnetic susceptibility corrected
COR_MEMO= T / If "T", LIA memory corrected
COR_EART= F / If "T", Earth limb corrected
COR_MOON= T / If "T", Moon corrected
COR_MARS= T / If "T", Mars corrected
COR_JUPI= T / If "T", Jupiter corrected
COR_SATU= T / If "T", Saturn corrected
VEL_SUN = T / If "T", Sun velocity corrected
VEL_EART= T / If "T", Earth velocity corrected
VEL_COBE= T / If "T", satellite velocity corrected
COMMENT Additional data corrections were also made for eclipse periods.
COMMENT See A.Kogut, et al., 1996, APJ, 470, 653.
COMMENT
COMMENT The following vector defines the dipole which has been removed
COMMENT from this dataset ("sun velocity correction").
COMMENT To restore the dipole to the SIGNAL for each datum add the dot
COMMENT product of this vector with the pointing for the observation.
COMMENT The vector is in thermodynamic temperature in Ecliptic coordinates.
DIP_MAG = 3.356230 / Magnitude in mK
COMMENT / of vector used to remove dipole
DIP_ELON= 171.8793 / Ecliptic longitude in degrees
COMMENT / of vector used to remove dipole
DIP_ELAT= -11.67802 / Ecliptic latitude in degrees
COMMENT / of vector used to remove dipole
END
DMR_CIO
XTENSION= 'BINTABLE' / Extension type is Binary Table
BITPIX = 8 / Binary data
NAXIS = 2 / Data are in a table
NAXIS1 = 40 / Number of 8 bit bytes in each row
NAXIS2 = 5184000 / Number of rows
PCOUNT = 0 / Number of bytes of data following table
GCOUNT = 1 / Group count (always 1 for bintable extensions)
TFIELDS = 10 / Number of fields (columns) in the table
COMMENT
COMMENT FITS optional reserved keywords:
EXTNAME = 'DMR_CIO '
COMMENT
COMMENT -------------------------------------------------------------------
COMMENT *******************************************************************
COMMENT ------NOTICE------
COMMENT This data compilation is a convenient summary of the data used
COMMENT in the publicly released 4-Year DMR Galactic frame sky maps.
COMMENT It should prove to be useful in testing new pixelization
COMMENT schemes or map generating algorithms which can then be
COMMENT DIRECTLY compared to the publicly available Galactic sky maps.
COMMENT These maps are available from the NSSDC.
COMMENT
COMMENT It does NOT contain the exhaustive flagging and ancilary
COMMENT spacecraft information found in the complete DMR
COMMENT Time-Ordered-Data set, also available as a data product
COMMENT from the NSSDC.
COMMENT
COMMENT -------WARNING------
COMMENT Note that slightly different time intervals were used for
COMMENT generation of the 31A and 31B Channel sky maps. The actual
COMMENT periods are summarized in sections 1.4.1 and 1.4.2 of the
COMMENT DMR Explanatory Supplements and should be retained to
COMMENT facilitate comparison of this product with the publicly
COMMENT released sky maps.
COMMENT -------------------------------------------------------------------
COMMENT *******************************************************************
COMMENT ---- DMR Calibrated Individual Observations ---
COMMENT
COMMENT Calibrated individual observations of the sky as
COMMENT measured by each of the 6 DMR detectors during the
COMMENT specified canonical month.
COMMENT
COMMENT Observations are Time-Ordered in 0.5 second increments
COMMENT between JSTART and JSTOP. No explicit time-stamp is
COMMENT provided for any given observation but can be constructed
COMMENT by the appropriate multiple 0.5 second increment from
COMMENT JSTART, which is assigned a value in the primary FITS header.
COMMENT For example, the data in row 1 of this table were obtained at
COMMENT JSTART, and the data in the ith row were obtained at time
COMMENT (i-1)*0.5 + JSTART.
COMMENT
COMMENT The temperature measurements have been calibrated and
COMMENT corrected for systematic errors as computed in the GALACTIC
COMMENT coordinate frame and described in detail in
COMMENT A.Kogut, et al., 1996, APJ, 470, 653.
COMMENT
COMMENT *******************************************************************
COMMENT --------------------------------------------------------------------
COMMENT ====================================================================
COMMENT DMR Sky Temperature Information:
COMMENT ====================================================================
COMMENT --------------------------------------------------------------------
COMMENT The following 6 columns tabulate the 0.5 second differential
COMMENT antenna temperature samples taken for each of the 6
COMMENT DMR detectors at the time of observation.
COMMENT The radiometric measurements
COMMENT are given as antenna temperatures in mK.
COMMENT Data which have been replaced by flagged (sentinel) values
COMMENT in processing have values .EQ. -16375.0
COMMENT
COMMENT Antenna temperature for Channel 31A
TTYPE1 = 'SIGNAL_31A' /
TUNIT1 = 'mK ' /
TFORM1 = '1E ' /
COMMENT Antenna temperature for Channel 31B
TTYPE2 = 'SIGNAL_31B' /
TUNIT2 = 'mK ' /
TFORM2 = '1E ' /
COMMENT Antenna temperature for Channel 53A
TTYPE3 = 'SIGNAL_53A' /
TUNIT3 = 'mK ' /
TFORM3 = '1E ' /
COMMENT Antenna temperature for Channel 53B
TTYPE4 = 'SIGNAL_53B' /
TUNIT4 = 'mK ' /
TFORM4 = '1E ' /
COMMENT Antenna temperature for Channel 90A
TTYPE5 = 'SIGNAL_90A' /
TUNIT5 = 'mK ' /
TFORM5 = '1E ' /
COMMENT Antenna temperature for Channel 90B
TTYPE6 = 'SIGNAL_90B' /
TUNIT6 = 'mK ' /
TFORM6 = '1E ' /
COMMENT --------------------------------------------------------------------
COMMENT ====================================================================
COMMENT Spatial Coordinate Information:
COMMENT ====================================================================
COMMENT --------------------------------------------------------------------
COMMENT The following 4 columns tabulate the components
COMMENT of the 4-component Attitude Quaternion vector
COMMENT used to quantify the DMR pointing information.
COMMENT Section 5.7.1.2 of the COBE/DIRBE Explanatory Supplement,
COMMENT ed. M.G. Hauser, T. Kelsall, D. Leisawitz, and J. Weiland,
COMMENT COBE Ref. Pub. No. 97-A (Greenbelt,MD: NASA/GSFC),
COMMENT available in electronic form from the NSSDC, describes,
COMMENT for example, how quaternions can be converted to RA and DEC.
COMMENT The DIRBE Explanatory Supplement can be obtained from the COBE
COMMENT Home Page at http://www.gsfc.nasa.gov/astro/cobe/cobe_home.html
COMMENT A fortran subroutine DMR_QUATERNIONS_TO_ATTITUDE, available
COMMENT from the COBE Home Page, converts the vector into pointing
COMMENT information for the two horns of the requested DMR Channel
COMMENT (eg. 31A).
COMMENT
COMMENT Component 1 of Quaternion vector: Q(i) i = 1
TTYPE7 = 'Q1 '
TUNIT7 = ' '
TFORM7 = '1E '
COMMENT Component 2 of Quaternion vector: Q(i) i = 2
TTYPE8 = 'Q2 '
TUNIT8 = ' '
TFORM8 = '1E '
COMMENT Component 3 of Quaternion vector: Q(i) i = 3
TTYPE9 = 'Q3 '
TUNIT9 = ' '
TFORM9 = '1E '
COMMENT Component 4 of Quaternion vector: Q(i) i = 4
TTYPE10 = 'Q4 '
TUNIT10 = ' '
TFORM10 = '1E '
COMMENT --------------------------------------------------------------------
END
