The two coordinates of a point on the celestial sphere. More...

#include <SkyPoint.h>

Collaboration diagram for Nice::SkyPoint:

Public Member Functions
	SkyPoint ()
	default constructor: Sets Ra, Dec and Alt, Az to NAN More...

	SkyPoint (const DMS &r, const DMS &d)
	constructor: Sets m_ra, Dec and m_ra0, Dec0 according to arguments. More...

	SkyPoint (const Nice::SkyPointVar &rd)
	Bridge constructor: Sets m_ra, Dec and m_ra0, Dec0 according to argument SpkyPointVar. More...

	SkyPoint (double r, double d)
	Default constructor using double arguments, for convenience. More...

virtual	~SkyPoint ()
	Dtor. More...

	operator Nice::SkyPointVar () const
	Cast operator SkyPointVar. More...

bool	isValidRaDec () const
	Checks if its a valid radec Does not set Altitude or Azimuth. More...

bool	isValidAltAz () const
	Checks if its a valid AltAz Does not set RaDec. More...

void	set (const DMS &r, const DMS &d)
	Sets m_ra, Dec and m_ra0, Dec0 according to arguments. More...

void	set (double r, double d)
	Sets both coordinates. More...

void	setRa (const DMS &r)
	Sets the current Right Ascension. More...

void	setRa (double r)
	Sets the right ascension. More...

void	setDec (const DMS &d)
	Sets the current Declination. More...

void	setDec (double d)
	Sets the declination. More...

void	setAlt (const DMS &alt)
	Sets the Altitude. More...

void	setAlt (double alt)
	Sets the altitude. More...

void	setAz (const DMS &az)
	Sets the Azimuth. More...

void	setAz (double az)
	Sets the azimuth. More...

DMS	ra () const

DMS	dec () const

DMS	az () const

DMS	alt () const

const DMS &	ra_ref () const

const DMS &	dec_ref () const

const DMS &	az_ref () const

const DMS &	alt_ref () const

DMS	pang (const DMS &LST, const GeoLocation &site=GeoLocation()) const
	Compute the parallactic angle. More...

DMS	pang (const DMS &HourAngle, const DMS &lat) const
	Compute the parallactic angle. More...

DMS	pangDot (const DMS &LST, const GeoLocation &site=GeoLocation())
	Compute the time derivative of the parallactic angle. More...

DMS	pangDot (const DMS &LST, const DMS &lat)
	Compute the time derivative of the parallactic angle. More...

void	EquatorialToHorizontal (const DMS &LST, const DMS &lat)
	Fix/compute the (Altitude, Azimuth) coordinates. More...

void	HorizontalToEquatorial (const DMS &LST, const DMS &lat)
	Determine the (m_ra, Dec) coordinates. More...

void	findEcliptic (const DMS &bliquity, DMS &EcLong, DMS &EcLat)
	Determine the Ecliptic coordinates of the SkyPoint, given the Julian Date. More...

void	setFromEcliptic (const DMS &Obliquity, const DMS &EcLong, const DMS &EcLat)
	Set the current (m_ra, Dec) coordinates of the SkyPoint, given pointers to its Ecliptic (Long, Lat) coordinates, and to the current obliquity angle (the angle between the equator and ecliptic). More...

void	Equatorial1950ToGalactic (DMS &galLong, DMS &galLat)
	Computes galactic coordinates from equatorial coordinates referred to epoch 1950. More...

void	GalacticToEquatorial1950 (const DMS &galLong, const DMS &galLat)
	Computes equatorial coordinates referred to 1950 from galactic ones referred to epoch B1950. More...

void	nutate (const Nice::SkyNumbers &num)
	Determine the effects of nutation for this SkyPoint. More...

void	aberrate (const Nice::SkyNumbers &num)
	Determine the effects of aberration for this SkyPoint. More...

SkyPoint	Eterms ()
	Determine the E-terms of aberration In the past, the mean places of stars published in catalogs included the contribution to the aberration due to the ellipticity of the orbit of the Earth. More...

void	B1950ToJ2000 ()
	Exact precession from Besselian epoch 1950 to epoch J2000. More...

void	J2000ToB1950 ()
	Exact precession from epoch J2000 Besselian epoch 1950. More...

void	addEterms ()
	Coordinates in the FK4 catalog include the effect of aberration due to the ellipticity of the orbit of the Earth. More...

void	subtractEterms (void)
	Coordinates in the FK4 catalog include the effect of aberration due to the ellipticity of the orbit of the Earth. More...

DMS	angularDistanceTo (const SkyPoint &sp) const
	Computes the angular distance between two SkyObjects. More...

bool	operator== (const SkyPoint &p) const

double	vRSite (double vsite[3])
	Computes the velocity of any object (oberver's site) projected on the direction of the source. More...

double	vTopocentric (double vgeo, double vsite[3])
	Computes the radial velocity of a source referred to the observer site on the surface of the earth from the geocentric velovity and the velocity of the site referred to the center of the Earth. More...

double	vTopoToVGeo (double vtopo, double vsite[3])
	Computes the radial velocity of a source referred to the center of the Earth from the radial velocity referred to an observer site on the surface of the earth. More...

	SkyPoint ()

	SkyPoint (const DMS &r, const DMS &d)

	SkyPoint (const Nice::SkyPointVar &rd)

	SkyPoint (double r, double d)

virtual	~SkyPoint ()

	operator Nice::SkyPointVar () const

bool	isValidRaDec () const

bool	isValidAltAz () const

void	set (const DMS &r, const DMS &d)

void	set (double r, double d)

void	setRa (const DMS &r)

void	setRa (double r)

void	setDec (const DMS &d)

void	setDec (double d)

void	setAlt (const DMS &alt)

void	setAlt (double alt)

void	setAz (const DMS &az)

void	setAz (double az)

DMS	ra () const

DMS	dec () const

DMS	az () const

DMS	alt () const

const DMS &	ra_ref () const

const DMS &	dec_ref () const

const DMS &	az_ref () const

const DMS &	alt_ref () const

DMS	pang (const DMS &LST, const GeoLocation &site=GeoLocation()) const

DMS	pang (const DMS &HourAngle, const DMS &lat) const

DMS	pangDot (const DMS &LST, const GeoLocation &site=GeoLocation())

DMS	pangDot (const DMS &LST, const DMS &lat)

void	EquatorialToHorizontal (const DMS &LST, const DMS &lat)

void	HorizontalToEquatorial (const DMS &LST, const DMS &lat)

void	findEcliptic (const DMS &bliquity, DMS &EcLong, DMS &EcLat)

void	setFromEcliptic (const DMS &Obliquity, const DMS &EcLong, const DMS &EcLat)

void	Equatorial1950ToGalactic (DMS &galLong, DMS &galLat)

void	GalacticToEquatorial1950 (const DMS &galLong, const DMS &galLat)

void	nutate (const Nice::SkyNumbers &num)

void	aberrate (const Nice::SkyNumbers &num)

SkyPoint	Eterms ()

void	B1950ToJ2000 ()

void	J2000ToB1950 ()

void	addEterms ()

void	subtractEterms (void)

DMS	angularDistanceTo (const SkyPoint &sp) const

bool	operator== (const SkyPoint &p) const

double	vRSite (double vsite[3])

double	vTopocentric (double vgeo, double vsite[3])

double	vTopoToVGeo (double vtopo, double vsite[3])

Static Public Member Functions
static double	ParAng (double _ha, double _dec, double _phi)
	compute the parallactic angle More...

static double	ParAng (double _ha, double _dec, double _phi)

Protected Attributes
DMS	m_ra
	current true sky coordinate RA More...

DMS	m_dec
	current true sky coordinate DEC More...

DMS	m_alt
	current altitude More...

DMS	m_az
	current azimuth Apparently this is oriented with N=0, E=90, as LBTO does. More...

Detailed Description

The two coordinates of a point on the celestial sphere.

The sky coordinates of a point in the sky. The coordinates are stored in both Equatorial (Right Ascension, Declination) and Horizontal (Azimuth, Altitude) coordinate systems. Provides set/get functions for each coordinate angle, and functions to convert between the Equatorial and Horizon coordinate systems.

Because the coordinate values change slowly over time (due to precession, nutation), the "catalog coordinates" are stored (m_ra0, Dec0), which were the true coordinates on Jan 1, 2000. The true coordinates (m_ra, Dec) at any other epoch can be found from the catalog coordinates using updateCoords(). Stores DMS coordinates for a point in the sky. for converting between coordinate systems.

Author: Jason Harris

Version: 11.02.04

Constructor & Destructor Documentation

◆ SkyPoint() [1/8]

Nice::SkyPoint::SkyPoint ( )

default constructor: Sets Ra, Dec and Alt, Az to NAN

◆ SkyPoint() [2/8]

Nice::SkyPoint::SkyPoint	(	const DMS &	r,
		const DMS &	d
	)

constructor: Sets m_ra, Dec and m_ra0, Dec0 according to arguments.

Does not set Altitude or Azimuth.

Parameters

r	Right Ascension
d	Declination

◆ SkyPoint() [3/8]

Nice::SkyPoint::SkyPoint ( const Nice::SkyPointVar & rd )

Bridge constructor: Sets m_ra, Dec and m_ra0, Dec0 according to argument SpkyPointVar.

Does not set Altitude or Azimuth.

Parameters

rd

◆ SkyPoint() [4/8]

Nice::SkyPoint::SkyPoint	(	double	r,
		double	d
	)

explicit

Default constructor using double arguments, for convenience.

It behaves essentially like the default constructor.

Parameters

r	Right Ascension, expressed as a double
d	Declination, expressed as a double

◆ ~SkyPoint() [1/2]

Nice::SkyPoint::~SkyPoint ( )

virtual

Dtor.

Does nothing. Actually this is superfluous becuase the default dtor would work as a POD.

◆ SkyPoint() [5/8]

Nice::SkyPoint::SkyPoint ( )

◆ SkyPoint() [6/8]

Nice::SkyPoint::SkyPoint	(	const DMS &	r,
		const DMS &	d
	)

◆ SkyPoint() [7/8]

Nice::SkyPoint::SkyPoint ( const Nice::SkyPointVar & rd )

◆ SkyPoint() [8/8]

Nice::SkyPoint::SkyPoint	(	double	r,
		double	d
	)

explicit

◆ ~SkyPoint() [2/2]

virtual Nice::SkyPoint::~SkyPoint ( )

virtual

Member Function Documentation

◆ aberrate() [1/2]

void Nice::SkyPoint::aberrate ( const Nice::SkyNumbers & num )

Determine the effects of aberration for this SkyPoint.

Parameters

num	pointer to SkyNumbers object containing current values of time-dependent variables.

◆ aberrate() [2/2]

void Nice::SkyPoint::aberrate ( const Nice::SkyNumbers & num )

◆ addEterms() [1/2]

void Nice::SkyPoint::addEterms ( )

Coordinates in the FK4 catalog include the effect of aberration due to the ellipticity of the orbit of the Earth.

Coordinates in the FK5 catalog do not include these terms. In order to convert from B1950 (FK4) to actual mean places one has to use this function.

◆ addEterms() [2/2]

void Nice::SkyPoint::addEterms ( )

◆ alt() [1/2]

Nice::DMS Nice::SkyPoint::alt ( ) const

Returns: the current Altitude.

◆ alt() [2/2]

DMS Nice::SkyPoint::alt ( ) const

◆ alt_ref() [1/2]

const DMS& Nice::SkyPoint::alt_ref ( ) const

inline

◆ alt_ref() [2/2]

const DMS& Nice::SkyPoint::alt_ref ( ) const

inline

◆ angularDistanceTo() [1/2]

Nice::DMS Nice::SkyPoint::angularDistanceTo ( const SkyPoint & sp ) const

Computes the angular distance between two SkyObjects.

The algorithm to compute this distance is: cos(distance) = sin(d1)*sin(d2) + cos(d1)*cos(d2)*cos(a1-a2) where a1,d1 are the coordinates of the first object and a2,d2 are the coordinates of the second object. However this algorithm is not accurate when the angular separation is small. Meeus provides a different algorithm in page 111 which we implement here.

Parameters

sp	SkyPoint to which distance is to be calculated

Returns: DMS angle representing angular separation.

◆ angularDistanceTo() [2/2]

DMS Nice::SkyPoint::angularDistanceTo ( const SkyPoint & sp ) const

◆ az() [1/2]

Nice::DMS Nice::SkyPoint::az ( ) const

Returns: the current Azimuth.

◆ az() [2/2]

DMS Nice::SkyPoint::az ( ) const

◆ az_ref() [1/2]

const DMS& Nice::SkyPoint::az_ref ( ) const

inline

◆ az_ref() [2/2]

const DMS& Nice::SkyPoint::az_ref ( ) const

inline

◆ B1950ToJ2000() [1/2]

void Nice::SkyPoint::B1950ToJ2000 ( )

Exact precession from Besselian epoch 1950 to epoch J2000.

The coordinates referred to the first epoch are in the FK4 catalog, while the latter are in the Fk5 one. Reference: Smith, C. A.; Kaplan, G. H.; Hughes, J. A.; Seidelmann, P. K.; Yallop, B. D.; Hohenkerk, C. Y. Astronomical Journal, vol. 97, Jan. 1989, p. 265-279 This transformation requires 4 steps:

Correct E-terms
Precess from B1950 to 1984, January 1st, 0h, using Newcomb expressions
Add zero point correction in right ascension for 1984
Precess from 1984, January 1st, 0h to J2000

◆ B1950ToJ2000() [2/2]

void Nice::SkyPoint::B1950ToJ2000 ( )

◆ dec() [1/2]

Nice::DMS Nice::SkyPoint::dec ( ) const

Returns: the current Declination.

◆ dec() [2/2]

DMS Nice::SkyPoint::dec ( ) const

◆ dec_ref() [1/2]

const DMS& Nice::SkyPoint::dec_ref ( ) const

inline

◆ dec_ref() [2/2]

const DMS& Nice::SkyPoint::dec_ref ( ) const

inline

◆ Equatorial1950ToGalactic() [1/2]

void Nice::SkyPoint::Equatorial1950ToGalactic	(	DMS &	galLong,
		DMS &	galLat
	)

◆ Equatorial1950ToGalactic() [2/2]

void Nice::SkyPoint::Equatorial1950ToGalactic	(	Nice::DMS &	galLong,
		Nice::DMS &	galLat
	)

Computes galactic coordinates from equatorial coordinates referred to epoch 1950.

m_ra and Dec are, therefore assumed to be B1950 coordinates.

◆ EquatorialToHorizontal() [1/2]

void Nice::SkyPoint::EquatorialToHorizontal	(	const DMS &	LST,
		const DMS &	lat
	)

◆ EquatorialToHorizontal() [2/2]

void Nice::SkyPoint::EquatorialToHorizontal	(	const DMS &	LST,
		const DMS &	lat
	)

Fix/compute the (Altitude, Azimuth) coordinates.

There is no return value, because the coordinates are stored internally. Start from (m_ra, Dec) coordinates, given the local sidereal time and the observer's latitude.

Parameters

LST	The local sidereal time
lat	The geographic latitude

◆ Eterms() [1/2]

Nice::SkyPoint Nice::SkyPoint::Eterms ( )

Determine the E-terms of aberration In the past, the mean places of stars published in catalogs included the contribution to the aberration due to the ellipticity of the orbit of the Earth.

These terms, known as E-terms were almost constant, and in the newer catalogs (FK5) are not included. Therefore to convert from FK4 to FK5 one has to compute these E-terms.

◆ Eterms() [2/2]

SkyPoint Nice::SkyPoint::Eterms ( )

◆ findEcliptic() [1/2]

void Nice::SkyPoint::findEcliptic	(	const DMS &	bliquity,
		DMS &	EcLong,
		DMS &	EcLat
	)

◆ findEcliptic() [2/2]

void Nice::SkyPoint::findEcliptic	(	const DMS &	bliquity,
		Nice::DMS &	EcLong,
		Nice::DMS &	EcLat
	)

Determine the Ecliptic coordinates of the SkyPoint, given the Julian Date.

The ecliptic coordinates are returned as reference arguments (since they are not stored internally)

◆ GalacticToEquatorial1950() [1/2]

void Nice::SkyPoint::GalacticToEquatorial1950	(	const DMS &	galLong,
		const DMS &	galLat
	)

◆ GalacticToEquatorial1950() [2/2]

void Nice::SkyPoint::GalacticToEquatorial1950	(	const DMS &	galLong,
		const DMS &	galLat
	)

Computes equatorial coordinates referred to 1950 from galactic ones referred to epoch B1950.

m_ra and Dec are, therefore assumed to be B1950 coordinates.

◆ HorizontalToEquatorial() [1/2]

void Nice::SkyPoint::HorizontalToEquatorial	(	const DMS &	LST,
		const DMS &	lat
	)

◆ HorizontalToEquatorial() [2/2]

void Nice::SkyPoint::HorizontalToEquatorial	(	const DMS &	LST,
		const DMS &	lat
	)

Determine the (m_ra, Dec) coordinates.

There is no return value, because the coordinates are stored internally. Start from its (Altitude, Azimuth) coordinates, given the local sidereal time and the observer's latitude.

Parameters

LST	the local sidereal time
lat	the geographic latitude

◆ isValidAltAz() [1/2]

bool Nice::SkyPoint::isValidAltAz ( ) const

◆ isValidAltAz() [2/2]

bool Nice::SkyPoint::isValidAltAz ( ) const

Checks if its a valid AltAz Does not set RaDec.

◆ isValidRaDec() [1/2]

bool Nice::SkyPoint::isValidRaDec ( ) const

◆ isValidRaDec() [2/2]

bool Nice::SkyPoint::isValidRaDec ( ) const

Checks if its a valid radec Does not set Altitude or Azimuth.

◆ J2000ToB1950() [1/2]

void Nice::SkyPoint::J2000ToB1950 ( void )

Exact precession from epoch J2000 Besselian epoch 1950.

The coordinates referred to the first epoch are in the FK4 catalog, while the latter are in the Fk5 one. Reference: Smith, C. A.; Kaplan, G. H.; Hughes, J. A.; Seidelmann, P. K.; Yallop, B. D.; Hohenkerk, C. Y. Astronomical Journal, vol. 97, Jan. 1989, p. 265-279 This transformation requires 4 steps:

Precess from J2000 to 1984, January 1st, 0h
Add zero point correction in right ascension for 1984
Precess from 1984, January 1st, 0h, to B1950 using Newcomb expressions
Correct E-terms

◆ J2000ToB1950() [2/2]

void Nice::SkyPoint::J2000ToB1950 ( )

◆ nutate() [1/2]

void Nice::SkyPoint::nutate ( const Nice::SkyNumbers & num )

Determine the effects of nutation for this SkyPoint.

Parameters

num	pointer to SkyNumbers object containing current values of time-dependent variables.

◆ nutate() [2/2]

void Nice::SkyPoint::nutate ( const Nice::SkyNumbers & num )

◆ operator Nice::SkyPointVar() [1/2]

Nice::SkyPoint::operator Nice::SkyPointVar ( ) const

Cast operator SkyPointVar.

◆ operator Nice::SkyPointVar() [2/2]

Nice::SkyPoint::operator Nice::SkyPointVar ( ) const

◆ operator==() [1/2]

bool Nice::SkyPoint::operator== ( const SkyPoint & p ) const

inline

◆ operator==() [2/2]

bool Nice::SkyPoint::operator== ( const SkyPoint & p ) const

inline

◆ pang() [1/4]

DMS Nice::SkyPoint::pang	(	const DMS &	LST,
		const GeoLocation &	site = `GeoLocation()`
	)		const

◆ pang() [2/4]

Nice::DMS Nice::SkyPoint::pang	(	const DMS &	LST,
		const GeoLocation &	site = `GeoLocation()`
	)		const

Compute the parallactic angle.

Parameters

LST	local siderial time
site	Observatory geographic location. The default argument is the LBT location on Mt Graham, AZ.

Returns: the parallactic angle.

Since: 2016-11-17

◆ pang() [3/4]

DMS Nice::SkyPoint::pang	(	const DMS &	HourAngle,
		const DMS &	lat
	)		const

◆ pang() [4/4]

Nice::DMS Nice::SkyPoint::pang	(	const DMS &	HourAngle,
		const DMS &	lat
	)		const

Compute the parallactic angle.

Parameters

HourAngle	The hour angle of the object.
lat	The geographic latitude.

Returns: the parallactic angle.

See also: eq. (A6) in arxiv:astro-ph/0608273

Since: 2016-11-18

◆ pangDot() [1/4]

DMS Nice::SkyPoint::pangDot	(	const DMS &	LST,
		const GeoLocation &	site = `GeoLocation()`
	)

◆ pangDot() [2/4]

Nice::DMS Nice::SkyPoint::pangDot	(	const DMS &	LST,
		const GeoLocation &	site = `GeoLocation()`
	)

Compute the time derivative of the parallactic angle.

Parameters

LST	local siderial time
site	Observatory geographic location. The default argument is the LBT location on Mt Graham, AZ.

Returns: the change of the parallactic angle over time. This is in units of DMS divided by seconds.

Since: 2017-04-06

◆ pangDot() [3/4]

DMS Nice::SkyPoint::pangDot	(	const DMS &	LST,
		const DMS &	lat
	)

◆ pangDot() [4/4]

Nice::DMS Nice::SkyPoint::pangDot	(	const DMS &	LST,
		const DMS &	lat
	)

Compute the time derivative of the parallactic angle.

Parameters

LST	local siderial time
lat	The geographic latitude.

Returns: the change of the parallactic angle with time. This is in units of DMS (intrinsically degrees) over seconds.

Since: 2017-04-06

◆ ParAng() [1/2]

static double Nice::SkyPoint::ParAng	(	double	_ha,
		double	_dec,
		double	_phi
	)

static

◆ ParAng() [2/2]

double Nice::SkyPoint::ParAng	(	double	ha,
		double	dec,
		double	phi
	)

static

compute the parallactic angle

Parameters

ha	Hour angle of the star in radians.
dec	Declination of the star in radians.
phi	Geographic latitude of the observer in radians.

Returns: The parallactic angle in radians

◆ ra() [1/2]

DMS Nice::SkyPoint::ra ( ) const

◆ ra() [2/2]

Nice::DMS Nice::SkyPoint::ra ( ) const

Returns: the current Right Ascension.

◆ ra_ref() [1/2]

const DMS& Nice::SkyPoint::ra_ref ( ) const

inline

◆ ra_ref() [2/2]

const DMS& Nice::SkyPoint::ra_ref ( ) const

inline

◆ set() [1/4]

void Nice::SkyPoint::set	(	const DMS &	r,
		const DMS &	d
	)

Sets m_ra, Dec and m_ra0, Dec0 according to arguments.

Does not set Altitude or Azimuth.

Parameters

r	Right Ascension
d	Declination

◆ set() [2/4]

void Nice::SkyPoint::set	(	const DMS &	r,
		const DMS &	d
	)

◆ set() [3/4]

void Nice::SkyPoint::set	(	double	r,
		double	d
	)

Sets both coordinates.

Parameters

r	Right Ascension in hours.
d	Declination in degrees.

◆ set() [4/4]

void Nice::SkyPoint::set	(	double	r,
		double	d
	)

◆ setAlt() [1/4]

void Nice::SkyPoint::setAlt ( const DMS & alt )

inline

Sets the Altitude.

Parameters

alt Altitude.

◆ setAlt() [2/4]

void Nice::SkyPoint::setAlt ( const DMS & alt )

inline

◆ setAlt() [3/4]

void Nice::SkyPoint::setAlt ( double alt )

inline

Sets the altitude.

Parameters

alt	Altitude in degrees.

◆ setAlt() [4/4]

void Nice::SkyPoint::setAlt ( double alt )

inline

◆ setAz() [1/4]

void Nice::SkyPoint::setAz ( const DMS & az )

inline

Sets the Azimuth.

Parameters

az Azimuth.

◆ setAz() [2/4]

void Nice::SkyPoint::setAz ( const DMS & az )

inline

◆ setAz() [3/4]

void Nice::SkyPoint::setAz ( double az )

inline

◆ setAz() [4/4]

void Nice::SkyPoint::setAz ( double az )

inline

Sets the azimuth.

Parameters

az	Azimuth in degrees.

◆ setDec() [1/4]

void Nice::SkyPoint::setDec ( const DMS & d )

inline

Sets the current Declination.

Parameters

d	Declination.

◆ setDec() [2/4]

void Nice::SkyPoint::setDec ( const DMS & d )

inline

◆ setDec() [3/4]

void Nice::SkyPoint::setDec ( double d )

inline

Sets the declination.

Parameters

d	Declination in degrees.

◆ setDec() [4/4]

void Nice::SkyPoint::setDec ( double d )

inline

◆ setFromEcliptic() [1/2]

void Nice::SkyPoint::setFromEcliptic	(	const DMS &	Obliquity,
		const DMS &	EcLong,
		const DMS &	EcLat
	)

Set the current (m_ra, Dec) coordinates of the SkyPoint, given pointers to its Ecliptic (Long, Lat) coordinates, and to the current obliquity angle (the angle between the equator and ecliptic).

◆ setFromEcliptic() [2/2]

void Nice::SkyPoint::setFromEcliptic	(	const DMS &	Obliquity,
		const DMS &	EcLong,
		const DMS &	EcLat
	)

◆ setRa() [1/4]

void Nice::SkyPoint::setRa ( const DMS & r )

inline

◆ setRa() [2/4]

void Nice::SkyPoint::setRa ( const DMS & r )

inline

Sets the current Right Ascension.

Parameters

r	Right Ascension.

◆ setRa() [3/4]

void Nice::SkyPoint::setRa ( double r )

inline

◆ setRa() [4/4]

void Nice::SkyPoint::setRa ( double r )

inline

Sets the right ascension.

Parameters

r	Right Ascension in hours.

◆ subtractEterms() [1/2]

void Nice::SkyPoint::subtractEterms ( void )

◆ subtractEterms() [2/2]

void Nice::SkyPoint::subtractEterms ( void )

Coordinates in the FK4 catalog include the effect of aberration due to the ellipticity of the orbit of the Earth.

Coordinates in the FK5 catalog do not include these terms. In order to convert from FK5 coordinates to B1950 (FK4) one has to use this function.

◆ vRSite() [1/2]

double Nice::SkyPoint::vRSite ( double vsite[3] )

◆ vRSite() [2/2]

double Nice::SkyPoint::vRSite ( double vsite[3] )

Computes the velocity of any object (oberver's site) projected on the direction of the source.

Parameters

vsite velocity of that object in cartesian coordinates

Returns: velocity of the object projected on the direction of the source kms-1

◆ vTopocentric() [1/2]

double Nice::SkyPoint::vTopocentric	(	double	vgeo,
		double	vsite[3]
	)

◆ vTopocentric() [2/2]

double Nice::SkyPoint::vTopocentric	(	double	vgeo,
		double	vsite[3]
	)

Computes the radial velocity of a source referred to the observer site on the surface of the earth from the geocentric velovity and the velocity of the site referred to the center of the Earth.

Parameters

vgeo	radial velocity of the source referred to the center of the earth in km/s
vsite	Velocity at which the observer moves referred to the center of the earth.

Returns: Radial velocity of the source referred to the observer's site in km/s

◆ vTopoToVGeo() [1/2]

double Nice::SkyPoint::vTopoToVGeo	(	double	vtopo,
		double	vsite[3]
	)

Computes the radial velocity of a source referred to the center of the Earth from the radial velocity referred to an observer site on the surface of the earth.

Parameters

vtopo	radial velocity of the source referred to the observer's site in km/s
vsite	Velocity at which the observer moves referred to the center of the earth.

Returns: Radial velocity of the source referred the center of the earth in km/s

◆ vTopoToVGeo() [2/2]

double Nice::SkyPoint::vTopoToVGeo	(	double	vtopo,
		double	vsite[3]
	)

Member Data Documentation

◆ m_alt

DMS Nice::SkyPoint::m_alt

protected

current altitude

◆ m_az

DMS Nice::SkyPoint::m_az

protected

current azimuth Apparently this is oriented with N=0, E=90, as LBTO does.

◆ m_dec

DMS Nice::SkyPoint::m_dec

protected

current true sky coordinate DEC

◆ m_ra

DMS Nice::SkyPoint::m_ra

protected

current true sky coordinate RA

The documentation for this class was generated from the following files:

/home/nirva/insroot/include/Nice/Map/SkyPoint.h
TwiceAsNice/nice/src/libNice/Nice/Map/SkyPoint.cc

Public Member Functions

Static Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ SkyPoint() [1/8]

◆ SkyPoint() [2/8]

◆ SkyPoint() [3/8]

◆ SkyPoint() [4/8]

◆ ~SkyPoint() [1/2]

◆ SkyPoint() [5/8]

◆ SkyPoint() [6/8]

◆ SkyPoint() [7/8]

◆ SkyPoint() [8/8]

◆ ~SkyPoint() [2/2]

Member Function Documentation

◆ aberrate() [1/2]

◆ aberrate() [2/2]

◆ addEterms() [1/2]

◆ addEterms() [2/2]

◆ alt() [1/2]

◆ alt() [2/2]

◆ alt_ref() [1/2]

◆ alt_ref() [2/2]

◆ angularDistanceTo() [1/2]

◆ angularDistanceTo() [2/2]

◆ az() [1/2]

◆ az() [2/2]

◆ az_ref() [1/2]

◆ az_ref() [2/2]

◆ B1950ToJ2000() [1/2]

◆ B1950ToJ2000() [2/2]

◆ dec() [1/2]

◆ dec() [2/2]

◆ dec_ref() [1/2]

◆ dec_ref() [2/2]

◆ Equatorial1950ToGalactic() [1/2]

◆ Equatorial1950ToGalactic() [2/2]

◆ EquatorialToHorizontal() [1/2]

◆ EquatorialToHorizontal() [2/2]

◆ Eterms() [1/2]

◆ Eterms() [2/2]

◆ findEcliptic() [1/2]

◆ findEcliptic() [2/2]

◆ GalacticToEquatorial1950() [1/2]

◆ GalacticToEquatorial1950() [2/2]

◆ HorizontalToEquatorial() [1/2]

◆ HorizontalToEquatorial() [2/2]

◆ isValidAltAz() [1/2]

◆ isValidAltAz() [2/2]

◆ isValidRaDec() [1/2]

◆ isValidRaDec() [2/2]

◆ J2000ToB1950() [1/2]

◆ J2000ToB1950() [2/2]

◆ nutate() [1/2]

◆ nutate() [2/2]

◆ operator Nice::SkyPointVar() [1/2]

◆ operator Nice::SkyPointVar() [2/2]

◆ operator==() [1/2]

◆ operator==() [2/2]

◆ pang() [1/4]

◆ pang() [2/4]

◆ pang() [3/4]

◆ pang() [4/4]

◆ pangDot() [1/4]

◆ pangDot() [2/4]

◆ pangDot() [3/4]

◆ pangDot() [4/4]

◆ ParAng() [1/2]

◆ ParAng() [2/2]

◆ ra() [1/2]

◆ ra() [2/2]

◆ ra_ref() [1/2]

◆ ra_ref() [2/2]

◆ set() [1/4]

◆ set() [2/4]

◆ set() [3/4]

◆ set() [4/4]

◆ setAlt() [1/4]

◆ setAlt() [2/4]