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|
#-----------------------------------------------------------------------------
# WCSLIB 8.5 - an implementation of the FITS WCS standard.
# Copyright (C) 1995-2025, Mark Calabretta
#
# This file is part of WCSLIB.
#
# WCSLIB is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
# more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with WCSLIB. If not, see http://www.gnu.org/licenses.
#
# Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
# http://www.atnf.csiro.au/people/Mark.Calabretta
# $Id: bth.keyrec,v 8.5 2025/12/06 13:47:41 mcalabre Exp $
#-----------------------------------------------------------------------------
#
# FITS header keyrecords used for testing by tbth1.
#
# Use 'tofits' (supplied) to convert this file to proper FITS format via
#
# tofits < bth.keyrec > bth.fits
#
# Lines in this file beginning with '#' are ignored by tofits.
#
#-----------------------------------------------------------------------------
XTENSION= 'BINTABLE' / Binary table extension
BITPIX = 8 / 8-bit bytes
NAXIS = 2 / 2-dimensional binary table
NAXIS1 = 3330 / Width of table in bytes
NAXIS2 = 68 / Number of rows in table
PCOUNT = 0 / Size of special data area
GCOUNT = 1 / One data group (required keyword)
TFIELDS = 33 / Number of fields in each row
COMMENT wcsbth() ignores all of the above keywords except for TFIELDS which it
COMMENT only considers to be advisory. In fact, TFIELDS here is incorrect
COMMENT (deliberately) since WCS keywords are present below for column numbers
COMMENT greater than 33.
COMMENT WARNING WARNING WARNING
COMMENT -------------------------
COMMENT This header has been developed for test purposes. It contains a mix
COMMENT of WCS keywords whose presence within a single FITS header extends or
COMMENT violates the FITS WCS standard.
COMMENT
COMMENT The main extension to the standard is the presence of image header
COMMENT keywords in what is meant to be a binary table extension header. The
COMMENT usage notes for wcsbth() in wcshdr.h explains how it interprets these
COMMENT keywords.
COMMENT -----------------------------------------------------------------------
COMMENT =======================================================================
COMMENT The primary image header keywords define a coordinate representation
COMMENT using AIPS-convention WCS keywords. As it happens, no binary table
COMMENT image array inherits these keywords and consequently they define an
COMMENT "unattached" representation, one that is not associated with any
COMMENT particular table column(s). Human intervention is required to form
COMMENT such an association based on a priori knowledge.
COMMENT
COMMENT An old FITS WCS interpreter that only understood the AIPS convention
COMMENT would most likely be confused by this header because NAXIS = 2 (above)
COMMENT is fixed for a binary table. wcsbth() ignores NAXIS and deduces that
COMMENT there are four coordinate axes by looking at the highest axis number
COMMENT encoded in the WCS keywords themselves.
COMMENT
COMMENT An old FITS WCS interpreter also would not recognize the new WCSNAMEa
COMMENT keyword, though its presence should not cause it any harm. It is set
COMMENT here solely for identification purposes.
COMMENT
COMMENT This representation contains only standard image header keywords, but
COMMENT their use in a binary table header is non-standard.
COMMENT -----------------------------------------------------------------------
COMMENT The following keyrecord is not part of the AIPS convention.
WCSNAME = 'AIPS convention: TAN projection' / Name of this coordinate system
CRPIX1 = 513.0 / Pixel coordinate of reference point
CRPIX2 = 513.0 / Pixel coordinate of reference point
CRPIX3 = 1025.0 / Pixel coordinate of reference point
CRPIX4 = 1.0 / Pixel coordinate of reference point
CDELT1 = -0.10 / x-scale
CDELT2 = 0.10 / y-scale
CROTA2 = 15.0 / Bulk image rotation
CTYPE1 = 'RA---TAN' / Right ascension in a gnomonic projection
CRVAL1 = 150.0 / [deg] Right ascension at the reference point
CTYPE2 = 'DEC--TAN' / Declination in a gnomonic projection
CRVAL2 = -30.0 / [deg] Declination at the reference point
EPOCH = 2000.0 / Equinox of equatorial coordinates
CDELT3 = 62.5e3 / Frequency scale
CTYPE3 = 'FREQ ' / Frequency axis
CRVAL3 = 1.3945e9 / [Hz] Reference frequency
VELREF = 258 / Barycentric radio velocity
ALTRPIX = 0.0 / Alternate reference pixel (not handled)
ALTRVAL = 0.0 / Alternate reference value (not handled)
RESTFREQ= 1.42040575e9 / HI rest frequency
CDELT4 = 1.0 / Stokes increment
CTYPE4 = 'STOKES ' / Stokes convention axis (I, Q, U, V)
CRVAL4 = 1.0 / Stokes I
COMMENT =======================================================================
COMMENT This coordinate representation utilizing a PCi_ja matrix expresses the
COMMENT above AIPS convention header using standard WCS keywords. This set of
COMMENT image header keywords with alternate representation 'I' is defined for
COMMENT the purpose of inheritance (below) and so does not result in an
COMMENT unattached representation as did the primary image header
COMMENT representation above.
COMMENT
COMMENT This representation contains only standard image header keywords but
COMMENT their use in a binary table header is non-standard.
COMMENT -----------------------------------------------------------------------
WCSAXESI= 4 / Number of coordinate axes
CRPIX1I = 513 / Pixel coordinate of reference point
CRPIX2I = 513 / Pixel coordinate of reference point
CRPIX3I = 1025 / Pixel coordinate of reference point
CRPIX4I = 1 / Pixel coordinate of reference point
PC1_1I = 0.965925826289 / Coordinate transformation matrix element
PC1_2I = 0.258819045103 / Coordinate transformation matrix element
PC2_1I = -0.258819045103 / Coordinate transformation matrix element
PC2_2I = 0.965925826289 / Coordinate transformation matrix element
CDELT1I = -0.1 / [deg] Coordinate increment at reference point
CDELT2I = 0.1 / [deg] Coordinate increment at reference point
CDELT3I = 62500 / [Hz] Coordinate increment at reference point
CDELT4I = 1 / Coordinate increment at reference point
CUNIT1I = 'deg' / Units of coordinate increment and value
CUNIT2I = 'deg' / Units of coordinate increment and value
CUNIT3I = 'Hz' / Units of coordinate increment and value
CTYPE1I = 'RA---TAN' / Right ascension, gnomonic projection
CTYPE2I = 'DEC--TAN' / Declination, gnomonic projection
CTYPE3I = 'FREQ' / Frequency (linear)
CTYPE4I = 'STOKES' / Coordinate type code
CRVAL1I = 150 / [deg] Coordinate value at reference point
CRVAL2I = -30 / [deg] Coordinate value at reference point
CRVAL3I = 1394500000 / [Hz] Coordinate value at reference point
CRVAL4I = 1 / Stokes I
LONPOLEI= 180 / [deg] Native longitude of celestial pole
LATPOLEI= -30 / [deg] Native latitude of celestial pole
RESTFRQI= 1420405750 / [Hz] Line rest frequency
RESTWAVI= 0 / [Hz] Line rest wavelength
WCSNAMEI= 'AIPS convention: TAN projection' / Coordinate system title
EQUINOXI= 2000 / [yr] Equinox of equatorial coordinates
SPECSYSI= 'BARYCENT' / Reference frame of spectral coordinates
COMMENT =======================================================================
COMMENT Binary table column 33 contains an image array, most of whose WCS
COMMENT keywords would be inherited from the preceding image header keywords
COMMENT with a = "I" provided that wcsbth() is invoked with an option that
COMMENT allows it (i.e. by setting the WCSHDR_ALLIMG flag in its 'relax'
COMMENT argument).
COMMENT
COMMENT Without full inheritance enabled, the presence of a single binary
COMMENT table image array keyword, WCSN33I, would not be sufficient to cause
COMMENT wcsbth() to create a wcsprm struct for this representation. However,
COMMENT with inheritance enabled, WCSN33I is sufficient to trigger this
COMMENT mechanism, in which case it overrides WCSNAMEI.
COMMENT
COMMENT Setting WCSHDR_AUXIMG alone only allows inheritance of the auxiliary
COMMENT image header keywords. In this case it would not be sufficient to
COMMENT cause wcsbth() to create a wcsprm struct for this representation
COMMENT because there are no WCS keywords, either direct or inherited, that
COMMENT allow the dimensionality of the coordinate system to be determined.
COMMENT
COMMENT The keyword is standard but such inheritance is non-standard.
COMMENT -----------------------------------------------------------------------
WCSN33I = 'All WCS keywords inherited except for this one' / WCS title
COMMENT =======================================================================
COMMENT Binary table column 44 is analogous to column 33 except with extra
COMMENT binary table image array keywords that may override the image-header
COMMENT equivalent if inheritance is enabled.
COMMENT
COMMENT wcsbth() would always create at least a 2D coordinate representation
COMMENT for column 44, regardless of what other keywords were inherited. If
COMMENT WCSHDR_ALLIMG was set, then a 4D representation would be constructed
COMMENT from inherited keywords. WCSHDR_AUXIMG would not be sufficient for
COMMENT this; however it would cause LONPOLEI and LATPOLEI to be inherited
COMMENT (and four others) and these would affect the interpretation of the
COMMENT coordinate system.
COMMENT
COMMENT The keywords are standard but such inheritance is non-standard.
COMMENT -----------------------------------------------------------------------
WCSN44I = 'Most WCS keywords inherited' / WCS title
1CTY44I = 'RA---SIN' / Right ascension, orthographic projection
2CTY44I = 'DEC--SIN' / Declination, orthographic projection
COMMENT =======================================================================
COMMENT Binary table keywords for the image array in column 77 with alternate
COMMENT representation 'B'.
COMMENT
COMMENT This coordinate representation utilizing a PC (ijPCna) matrix
COMMENT expresses the above gnomonic (TAN) projection as a slant zenithal
COMMENT perspective projection (SZP) in order to test the reading of a number
COMMENT of PVi_ma keywords. It also includes a linear time axis.
COMMENT
COMMENT This representation contains only standard keywords and usage. In
COMMENT particular, it is is self-contained, i.e. no inheritance.
COMMENT -----------------------------------------------------------------------
WCAX77B = 4 / Number of coordinate axes
1CRP77B = 513 / Pixel coordinate of reference point
2CRP77B = 513 / Pixel coordinate of reference point
3CRP77B = 1025 / Pixel coordinate of reference point
4CRP77B = 1 / Pixel coordinate of reference point
11PC77B = 0.866025404 / Coordinate transformation matrix element
12PC77B = 0.5 / Coordinate transformation matrix element
21PC77B = -0.5 / Coordinate transformation matrix element
22PC77B = 0.866025404 / Coordinate transformation matrix element
1CDE77B = -0.1 / [deg] Coordinate increment at reference point
2CDE77B = 0.1 / [deg] Coordinate increment at reference point
3CDE77B = -9.635265432e-06 / [m] Coordinate increment at reference point
4CDE77B = 1 / [s] Coordinate increment at reference point
1CUN77B = 'deg' / Units of coordinate increment and value
2CUN77B = 'deg' / Units of coordinate increment and value
3CUN77B = 'm' / Units of coordinate increment and value
4CUN77B = 's' / Units of coordinate increment and value
1CTY77B = 'RA---SZP' / Right ascension, slant zenithal perspective pro
2CTY77B = 'DEC--SZP' / Declination, slant zenithal perspective project
3CTY77B = 'WAVE-F2W' / Vacuum wavelength (linear in frequency)
4CTY77B = 'TIME' / Coordinate type code
1CRV77B = 150 / [deg] Coordinate value at reference point
2CRV77B = -30 / [deg] Coordinate value at reference point
3CRV77B = 0.214982042 / [m] Coordinate value at reference point
4CRV77B = -2000 / [s] Coordinate value at reference point
1V77_1B = 0 / [deg] Native longitude of the reference point
1V77_2B = 90 / [deg] Native latitude of the reference point
1V77_3B = 195 / [deg] alias for LONP77A (has precedence)
1V77_4B = -30 / [deg] alias for LATP77A (has precedence)
2V77_1B = 0 / SZP projection parameter
2V77_2B = 180 / SZP projection parameter
2V77_3B = 45 / SZP projection parameter
4S77_0B = 'UTC' / Coordinate transformation parameter
LONP77B = 195 / [deg] Native longitude of celestial pole
LATP77B = -30 / [deg] Native latitude of celestial pole
RFRQ77B = 1420405750 / [Hz] Line rest frequency
RWAV77B = 0.211061141 / [Hz] Line rest wavelength
WCSN77B = 'St''d representation: SZP projection' / Coordinate system title
1CNA77B = 'Right ascension (J2000)' / Axis name for labelling purposes
2CNA77B = 'Declination (J2000)' / Axis name for labelling purposes
3CNA77B = 'Wavelength' / Axis name for labelling purposes
4CNA77B = 'Time offset' / Axis name for labelling purposes
3CRD77B = 1e-11 / [m] Random error in coordinate
3CSY77B = 1e-12 / [m] Systematic error in coordinate
DOBS77 = '1957-02-14T15:00:00' / ISO-8601 observation date
MJDOB77 = 35883.625000 / [d] MJD of observation
DAVG77 = '1957-02-14T16:48:00' / ISO-8601 time at midpoint of observation
MJDA77 = 35883.700000 / [d] MJD at midpoint of observation
OBSGX77 = -4554231.5 / [m] observatory X-coordinate
COMMENT OBSGEO-Y (below) should be inherited for OBSGY77.
OBSGZ77 = -3454036.3 / [m] observatory Z-coordinate
RADE77B = 'FK5' / Equatorial coordinate system
EQUI77B = 2000 / [yr] Equinox of equatorial coordinates
SPEC77B = 'BARYCENT' / Reference frame of spectral coordinates
SOBS77B = 'TOPOCENT' / Reference frame of spectral observation
VSYS77B = 1500 / [m/s] Velocity towards source
ZSOU77B = 0.0025 / Redshift of the source
SSRC77B = 'LSRK' / Reference frame of source redshift
VANG77B = 0.00 / [deg] Velocity orientation angle
COMMENT =======================================================================
COMMENT Pixel list keywords with axes in columns 8, 9 and 10 and alternate
COMMENT representation 'P'.
COMMENT
COMMENT In the IRAF representation, if one CDi_ja (TCDn_ka) keyword is given
COMMENT then the default is zero for any that are omitted. CDELTia (TCDLTna)
COMMENT and CROTAn (TCROTna) keywords are included for informational purposes
COMMENT only and otherwise are to be ignored.
COMMENT
COMMENT This representation uses the non-standard long form for some pixel
COMMENT list keywords with non-blank alternate version specifier (these forms
COMMENT are standard for a = ' ' only):
COMMENT TCRPXna instead of TCRPna
COMMENT TCDn_ka TCn_ka
COMMENT TCDLTna TCDEna
COMMENT TCUNIna TCUNna
COMMENT TCTYPna TCTYna
COMMENT TCRVLna TCRVna
COMMENT TPVn_ma TVn_ma
COMMENT TCNAMna TCNAna
COMMENT TCRDEna TCRDna
COMMENT TCSYEna TCSYna
COMMENT Also, strictly speaking, alternate version codes are not defined for
COMMENT TCROTn (e.g. TCROT9P below), and WCSNna should be TWCSna. However,
COMMENT these are considered to be natural extensions that all FITS WCS
COMMENT interpreters should support. Apart from that, this representation
COMMENT contains standard keywords and usage.
COMMENT
COMMENT For reasons explained in the usage notes for wcsbth() in wcshdr.h,
COMMENT OBSGX99, OBSGEO-Y, and OBSGZ77, which appears above, apply to the
COMMENT pixel list image in this header.
COMMENT -----------------------------------------------------------------------
TCRPX8P = 513 / Pixel coordinate of reference point
TCRPX9P = 513 / Pixel coordinate of reference point
TCRPX10P= 1025 / Pixel coordinate of reference point
TCD8_8P = -0.08660254 / Coordinate transformation matrix element
TCD8_9P = -0.05 / Coordinate transformation matrix element
TCD9_8P = -0.05 / Coordinate transformation matrix element
TCD9_9P = 0.08660254 / Coordinate transformation matrix element
TC10_10P= -4.565153674e-5 / Coordinate transformation matrix element
TCDLT8P = -0.10 / [deg] Coordinate increment at reference point
TCDLT9P = 0.10 / [deg] Coordinate increment at reference point
TCDLT10P= -4.565153674e-5 / Coordinate increment at reference point
TCROT9P = 30.0 / [deg] Bulk image rotation
TCUNI8P = 'deg' / Units of coordinate increment and value
TCUNI9P = 'deg' / Units of coordinate increment and value
TCTYP8P = 'RA---ZPN' / Right ascension, zenithal/azimuthal polynomial
TCTYP9P = 'DEC--ZPN' / Declination, zenithal/azimuthal polynomial proj
TCTYP10P= 'ZOPT-F2W' / Redshift (linear in frequency)
TCRVL8P = 150 / [deg] Coordinate value at reference point
TCRVL9P = -30 / [deg] Coordinate value at reference point
TCRVL10P= 0.018577089 / Coordinate value at reference point
TPV9_1P = 1 / ZPN projection parameter
TPV9_3P = 0.333333333 / ZPN projection parameter
TPV9_5P = 0.133333333 / ZPN projection parameter
TPV9_7P = 0.053968254 / ZPN projection parameter
TPV9_9P = 0.021869489 / ZPN projection parameter
TPV9_11P= 0.008863236 / ZPN projection parameter
TPV9_13P= 0.003592128 / ZPN projection parameter
TPV9_15P= 0.001455834 / ZPN projection parameter
TPV9_17P= 0.000590027 / ZPN projection parameter
TPV9_19P= 0.000239129 / ZPN projection parameter
LONP8P = 195 / [deg] Native longitude of celestial pole
LATP8P = -30 / [deg] Native latitude of celestial pole
RFRQ8P = 1420405750 / [Hz] Line rest frequency
RWAV8P = 0.211061141 / [Hz] Line rest wavelength
WCSN8P = 'IRAF representation: ZPN projection' / Coordinate system title
TCNAM8P = 'Right ascension (J2000)' / Axis name for labelling purposes
TCNAM9P = 'Declination (J2000)' / Axis name for labelling purposes
TCNAM10P= 'Redshift' / Axis name for labelling purposes
TCRDE10P= 5e-11 / Random error in coordinate
TCSYE10P= 5e-12 / Systematic error in coordinate
DOBS8 = '1957-02-14T15:00:00' / ISO-8601 time of observation
MJDOB8 = 35883.625000 / [d] MJD of observation
DAVG8 = '1957-02-14T16:48:00' / ISO-8601 time at midpoint of observation
MJDA8 = 35883.700000 / [d] MJD at midpoint of observation
OBSGX99 = -4554231.53 / [m] observatory X-coordinate
RADE8P = 'FK5' / Equatorial coordinate system
EQUI8P = 2000 / [yr] Equinox of equatorial coordinates
SPEC8P = 'BARYCENT' / Reference frame of spectral coordinates
SOBS8P = 'TOPOCENT' / Reference frame of spectral observation
VSYS8P = 1500 / [m/s] Velocity towards source
ZSOU8P = 0.00250000001174 / Redshift of the source
SSRC8P = 'LSRK' / Reference frame of source redshift
VANG8P = 0.00 / [deg] Velocity orientation angle
COMMENT =======================================================================
COMMENT By themselves, these primary image header auxiliary WCS keywords
COMMENT should not be sufficient to cause a wcsprm struct to be created for
COMMENT representation X, nor should they affect any of the others.
COMMENT -----------------------------------------------------------------------
LONPOLEX= 180.0 / [deg] Native longitude of the NCP
LATPOLEX= 999.0 / [deg] Native latitude of the NCP
RESTFRQX= 1.42040575e9 / [Hz] HI rest frequency
RESTWAVX= 0.211061141 / [m] HI rest wavelength
WCSNAMEX= 'eXtraneous' / Name of this coordinate system
RADESYSX= 'ICRS' / Mean equatorial coordinates, IAU 1984 system
EQUINOXX= 2000.0 / [yr] Equinox of equatorial coordinates
SPECSYSX= 'BARYCENT' / Reference frame of spectral coordinates
SSYSOBSX= 'TOPOCENT' / Reference frame of observation
VELOSYSX= 1500.0 / [m/s] Bary-topo velocity towards the source
ZSOURCEX= 0.0025 / Redshift of the source
SSYSSRCX= 'LSRK' / Reference frame of source redshift
VELANGLX= 35.25 / [deg] Velocity orientation angle
COMMENT =======================================================================
COMMENT The following global keywords have no alternates. Except where
COMMENT overridden by their binary table equivalents, they apply to each
COMMENT coordinate representation, even that of the AIPS convention for
COMMENT which, strictly, only the DATE-OBS keyword should be recognized.
COMMENT
COMMENT For test purposes, the remaining standard global WCS-related keywords
COMMENT are included here, even though there is considerable overlap between
COMMENT them. Specifically, the keywords in the following groups all convey
COMMENT the same information, only one need be given:
COMMENT - MJDREF, MJDREFI + MJDREFF, JDREF, and JDREFI + JDREFF;
COMMENT - DATE-OBS, MJD-OBS, JEPOCH, and BEPOCH;
COMMENT - DATE-AVG and MJD-AVG;
COMMENT - DATE-BEG, MJD-BEG, and TSTART;
COMMENT - DATE-END, MJD-END, and TSTOP;
COMMENT - OBSGEO-[XYZ] and OBSGEO-[LBH];
COMMENT - TELAPSE, DATE-END - DATE-BEG, MJD-END - MJD-BEG, and
COMMENT TSTOP - TSTART.
COMMENT Interpretation is undefined if there are any inconsistencies between
COMMENT them.
COMMENT
COMMENT The keycomments for OBSGEO-Y and OBSGEO-Z have been omitted
COMMENT deliberately for test purposes.
COMMENT -----------------------------------------------------------------------
TIMESYS = 'UTC' / Time scale
TREFPOS = 'TOPOCENTRE' / Time reference position, with OBSGEO-[XYZLBH]
TREFDIR = 'RA_NOM,DEC_NOM' / Time reference direction
PLEPHEM = 'DE405' / Ephemerides used for pathlength delays
TIMEUNIT= 's' / Time units
DATEREF = '1957-02-14T15:00:00'/ ISO-8601 fiducial time
MJDREF = 35883.625000 / [d] MJD of fiducial time
MJDREFI = 35883 / [d] MJD of fiducial time, integer part
MJDREFF = 0.625000 / [d] MJD of fiducial time, fractional part
JDREF = 2435884.125000 / [d] JD of fiducial time
JDREFI = 2435884 / [d] JD of fiducial time, integer part
JDREFF = 0.125000 / [d] JD of fiducial time, fractional part
TIMEOFFS= 0.010 / [s] Clock correction
DATE-OBS= '1957-02-14T15:00:00'/ ISO-8601 time of observation
MJD-OBS = 35883.625000 / [d] MJD of observation
JEPOCH = 1957.125598905 / [a] Julian epoch of observation
BEPOCH = 1957.125960663 / [a] Besselian epoch of observation
DATE-BEG= '1957-02-14T15:00:00'/ ISO-8601 time at start of observation
MJD-BEG = 35883.625000 / [d] MJD at start of observation
TSTART = 0.0 / [s] Time elapsed since fiducial time at start
DATE-AVG= '1957-02-14T16:48:00'/ ISO-8601 time at midpoint of observation
MJD-AVG = 35883.700000 / [d] MJD at midpoint of observation
DATE-END= '1957-02-14T18:36:00'/ ISO-8601 time at end of observation
MJD-END = 35883.775000 / [d] MJD at end of observation
TSTOP = 12960.0 / [s] Time elapsed since fiducial time at end
XPOSURE = 12960.0 / [s] Exposure (integration) time
TELAPSE = 12960.0 / [s] Elapsed time (start to stop)
TIMSYER = 5E-5 / [s] Systematic error in time measurements
TIMRDER = 1E-9 / [s] Relative error in time measurements
TIMEDEL = 1.0 / [s] Time resolution
TIMEPIXR= 0.5 / Reference position of timestamp in binned data
OBSGEO-X= -4554231.533 / [m] WGS84 coordinates of Parkes radiotelescope
OBSGEO-Y= 2816759.109 /
OBSGEO-Z= -3454036.323
OBSGEO-L= 148.263510 / [deg] WGS84, IAU(1976) ellipsoid, longitude
OBSGEO-B= -32.998406 / [deg] WGS84, IAU(1976) ellipsoid, latitude
OBSGEO-H= 411.793 / [m] WGS84, IAU(1976) ellipsoid, height
OBSORBIT= 'sputnik-1957.eph' / Spacecraft orbit ephemeris file
COMMENT =======================================================================
COMMENT The following global auxiliary keywords are non-standard but widely
COMMENT used in particular fields of astronomy. They reside within the
COMMENT auxprm struct in wcsprm. Their presence here should cause that
COMMENT struct to be allocated and filled.
COMMENT -----------------------------------------------------------------------
RSUN_REF= 696E+6 / [m] Solar radius
DSUN_OBS= 150.7E+9 / [m] Distance from centre of Sun to observer
CRLN_OBS= 120.0 / [deg] Carrington heliographic lng of observer
HGLN_OBS= 0.0 / [deg] Stonyhurst heliographic lng of observer
HGLT_OBS= 7.25 / [deg] Heliographic latitude of the observer
A_RADIUS= 12.0E+7 / [m] Object ellipsoid semi-major axis
B_RADIUS= 11.0E+7 / [m] Object ellipsoid semi-intermediate axis
C_RADIUS= 10.0E+7 / [m] Object ellipsoid semi-minor axis
BLON_OBS= 155.0 / [deg] Bodycentric longitude of observer
BLAT_OBS= -33.0 / [deg] Bodycentric latitude of observer
BDIS_OBS= 137E+9 / [m] Bodycentric distance of observer
END
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