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LSST Data Management Base Package
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ProperMotion.cc
Go to the documentation of this file.
1// -*- LSST-C++ -*-
2/*
3 * This file is part of jointcal.
4 *
5 * Developed for the LSST Data Management System.
6 * This product includes software developed by the LSST Project
7 * (https://www.lsst.org).
8 * See the COPYRIGHT file at the top-level directory of this distribution
9 * for details of code ownership.
10 *
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 */
24
25#include <cmath>
26#include <iostream>
29#include "lsst/jointcal/Point.h"
30
31namespace lsst {
32namespace jointcal {
33
34Point ProperMotion::apply(const Point& star, double timeDeltaYears) const {
35 geom::SpherePoint spherePoint(star.x, star.y, geom::degrees);
36 double amount = std::hypot(_ra * timeDeltaYears, _dec * timeDeltaYears);
37 // If delta-time is negative, the correction is in the opposite direction.
38 amount = timeDeltaYears < 0 ? -amount : amount;
39 auto result = spherePoint.offset(_offsetBearing * geom::radians, amount * geom::radians);
40 Point newStar(star);
41 newStar.x = result.getRa().asDegrees();
42 newStar.y = result.getDec().asDegrees();
43 return newStar;
44}
45
47 stream << "pm_ra*cos(dec)=" << pm._ra << "rad/yr, pm_dec=" << pm._dec << "rad/yr, pm_raErr=" << pm._raErr
48 << "rad/yr, pm_decErr=" << pm._decErr << "rad/yr, pm_raDecCov=" << pm._raDecCov;
49 return stream;
50}
51
52} // namespace jointcal
53} // namespace lsst
Point in an unspecified spherical coordinate system.
Definition SpherePoint.h:57
SpherePoint offset(Angle const &bearing, Angle const &amount) const
Return a point offset from this one along a great circle.
A point in a plane.
Definition Point.h:37
double x
coordinate
Definition Point.h:42
Point apply(const Point &star, double timeDeltaYears) const
Apply proper motion correction to the input star, returning a star with PM-corrected coordinates.
ProperMotion(double ra, double dec, double raErr, double decErr, double raDecCov=0)
T hypot(T... args)
AngleUnit constexpr degrees
constant with units of degrees
Definition Angle.h:110
AngleUnit constexpr radians
constant with units of radians
Definition Angle.h:109
basic_ostream< char, traits > & operator<<(basic_ostream< char, traits > &, const char *)