diff options
Diffstat (limited to 'ast/erfa/atoc13.c')
| -rw-r--r-- | ast/erfa/atoc13.c | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/ast/erfa/atoc13.c b/ast/erfa/atoc13.c deleted file mode 100644 index 8f0932c..0000000 --- a/ast/erfa/atoc13.c +++ /dev/null @@ -1,233 +0,0 @@ -#include "erfa.h" - -int eraAtoc13(const char *type, double ob1, double ob2, - double utc1, double utc2, double dut1, - double elong, double phi, double hm, double xp, double yp, - double phpa, double tc, double rh, double wl, - double *rc, double *dc) -/* -** - - - - - - - - - - -** e r a A t o c 1 3 -** - - - - - - - - - - -** -** Observed place at a groundbased site to to ICRS astrometric RA,Dec. -** The caller supplies UTC, site coordinates, ambient air conditions -** and observing wavelength. -** -** Given: -** type char[] type of coordinates - "R", "H" or "A" (Notes 1,2) -** ob1 double observed Az, HA or RA (radians; Az is N=0,E=90) -** ob2 double observed ZD or Dec (radians) -** utc1 double UTC as a 2-part... -** utc2 double ...quasi Julian Date (Notes 3,4) -** dut1 double UT1-UTC (seconds, Note 5) -** elong double longitude (radians, east +ve, Note 6) -** phi double geodetic latitude (radians, Note 6) -** hm double height above ellipsoid (m, geodetic Notes 6,8) -** xp,yp double polar motion coordinates (radians, Note 7) -** phpa double pressure at the observer (hPa = mB, Note 8) -** tc double ambient temperature at the observer (deg C) -** rh double relative humidity at the observer (range 0-1) -** wl double wavelength (micrometers, Note 9) -** -** Returned: -** rc,dc double ICRS astrometric RA,Dec (radians) -** -** Returned (function value): -** int status: +1 = dubious year (Note 4) -** 0 = OK -** -1 = unacceptable date -** -** Notes: -** -** 1) "Observed" Az,ZD means the position that would be seen by a -** perfect geodetically aligned theodolite. (Zenith distance is -** used rather than altitude in order to reflect the fact that no -** allowance is made for depression of the horizon.) This is -** related to the observed HA,Dec via the standard rotation, using -** the geodetic latitude (corrected for polar motion), while the -** observed HA and RA are related simply through the Earth rotation -** angle and the site longitude. "Observed" RA,Dec or HA,Dec thus -** means the position that would be seen by a perfect equatorial -** with its polar axis aligned to the Earth's axis of rotation. -** -** 2) Only the first character of the type argument is significant. -** "R" or "r" indicates that ob1 and ob2 are the observed right -** ascension and declination; "H" or "h" indicates that they are -** hour angle (west +ve) and declination; anything else ("A" or -** "a" is recommended) indicates that ob1 and ob2 are azimuth -** (north zero, east 90 deg) and zenith distance. -** -** 3) utc1+utc2 is quasi Julian Date (see Note 2), apportioned in any -** convenient way between the two arguments, for example where utc1 -** is the Julian Day Number and utc2 is the fraction of a day. -** -** However, JD cannot unambiguously represent UTC during a leap -** second unless special measures are taken. The convention in the -** present function is that the JD day represents UTC days whether -** the length is 86399, 86400 or 86401 SI seconds. -** -** Applications should use the function eraDtf2d to convert from -** calendar date and time of day into 2-part quasi Julian Date, as -** it implements the leap-second-ambiguity convention just -** described. -** -** 4) The warning status "dubious year" flags UTCs that predate the -** introduction of the time scale or that are too far in the -** future to be trusted. See eraDat for further details. -** -** 5) UT1-UTC is tabulated in IERS bulletins. It increases by exactly -** one second at the end of each positive UTC leap second, -** introduced in order to keep UT1-UTC within +/- 0.9s. n.b. This -** practice is under review, and in the future UT1-UTC may grow -** essentially without limit. -** -** 6) The geographical coordinates are with respect to the ERFA_WGS84 -** reference ellipsoid. TAKE CARE WITH THE LONGITUDE SIGN: the -** longitude required by the present function is east-positive -** (i.e. right-handed), in accordance with geographical convention. -** -** 7) The polar motion xp,yp can be obtained from IERS bulletins. The -** values are the coordinates (in radians) of the Celestial -** Intermediate Pole with respect to the International Terrestrial -** Reference System (see IERS Conventions 2003), measured along the -** meridians 0 and 90 deg west respectively. For many -** applications, xp and yp can be set to zero. -** -** 8) If hm, the height above the ellipsoid of the observing station -** in meters, is not known but phpa, the pressure in hPa (=mB), is -** available, an adequate estimate of hm can be obtained from the -** expression -** -** hm = -29.3 * tsl * log ( phpa / 1013.25 ); -** -** where tsl is the approximate sea-level air temperature in K -** (See Astrophysical Quantities, C.W.Allen, 3rd edition, section -** 52). Similarly, if the pressure phpa is not known, it can be -** estimated from the height of the observing station, hm, as -** follows: -** -** phpa = 1013.25 * exp ( -hm / ( 29.3 * tsl ) ); -** -** Note, however, that the refraction is nearly proportional to -** the pressure and that an accurate phpa value is important for -** precise work. -** -** 9) The argument wl specifies the observing wavelength in -** micrometers. The transition from optical to radio is assumed to -** occur at 100 micrometers (about 3000 GHz). -** -** 10) The accuracy of the result is limited by the corrections for -** refraction, which use a simple A*tan(z) + B*tan^3(z) model. -** Providing the meteorological parameters are known accurately and -** there are no gross local effects, the predicted astrometric -** coordinates should be within 0.05 arcsec (optical) or 1 arcsec -** (radio) for a zenith distance of less than 70 degrees, better -** than 30 arcsec (optical or radio) at 85 degrees and better -** than 20 arcmin (optical) or 30 arcmin (radio) at the horizon. -** -** Without refraction, the complementary functions eraAtco13 and -** eraAtoc13 are self-consistent to better than 1 microarcsecond -** all over the celestial sphere. With refraction included, -** consistency falls off at high zenith distances, but is still -** better than 0.05 arcsec at 85 degrees. -** -** 11) It is advisable to take great care with units, as even unlikely -** values of the input parameters are accepted and processed in -** accordance with the models used. -** -** Called: -** eraApco13 astrometry parameters, ICRS-observed -** eraAtoiq quick observed to CIRS -** eraAticq quick CIRS to ICRS -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - int j; - eraASTROM astrom; - double eo, ri, di; - - -/* Star-independent astrometry parameters. */ - j = eraApco13(utc1, utc2, dut1, elong, phi, hm, xp, yp, - phpa, tc, rh, wl, &astrom, &eo); - -/* Abort if bad UTC. */ - if ( j < 0 ) return j; - -/* Transform observed to CIRS. */ - eraAtoiq(type, ob1, ob2, &astrom, &ri, &di); - -/* Transform CIRS to ICRS. */ - eraAticq(ri, di, &astrom, rc, dc); - -/* Return OK/warning status. */ - return j; - -/* Finished. */ - -} -/*---------------------------------------------------------------------- -** -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** All rights reserved. -** -** This library is derived, with permission, from the International -** Astronomical Union's "Standards of Fundamental Astronomy" library, -** available from http://www.iausofa.org. -** -** The ERFA version is intended to retain identical functionality to -** the SOFA library, but made distinct through different function and -** file names, as set out in the SOFA license conditions. The SOFA -** original has a role as a reference standard for the IAU and IERS, -** and consequently redistribution is permitted only in its unaltered -** state. The ERFA version is not subject to this restriction and -** therefore can be included in distributions which do not support the -** concept of "read only" software. -** -** Although the intent is to replicate the SOFA API (other than -** replacement of prefix names) and results (with the exception of -** bugs; any that are discovered will be fixed), SOFA is not -** responsible for any errors found in this version of the library. -** -** If you wish to acknowledge the SOFA heritage, please acknowledge -** that you are using a library derived from SOFA, rather than SOFA -** itself. -** -** -** TERMS AND CONDITIONS -** -** Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions -** are met: -** -** 1 Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** -** 2 Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** -** 3 Neither the name of the Standards Of Fundamental Astronomy Board, -** the International Astronomical Union nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -** POSSIBILITY OF SUCH DAMAGE. -** -*/ |