CAAPrecession_EquatorialPMToEcliptic: CAAPrecession_EquatorialPMToEcliptic

In helixcn/skycalc: Computational Astronomy in R based on PJ Naughter's AA+ library

Description

CAAPrecession_EquatorialPMToEcliptic

Usage

CAAPrecession_EquatorialPMToEcliptic(Alpha, Delta, Beta, PMAlpha, PMDelta, Epsilon)

Arguments

Alpha	Alpha The right ascension expressed as an hour angle.
Delta	Delta The declination in degrees.
Beta	Beta The ecliptical latitude of the star in degrees.
PMAlpha	PMAlpha The proper motion in right ascension in arc seconds per year.
PMDelta	PMDelta The proper motion of the declination in arc seconds per year.
Epsilon	Epsilon The obliquity of the ecliptic in degrees.

Value

Returns the converted ecliptic proper motions in a CAA2DCoordinate class. The x value in the class corresponds to the proper motion in ecliptical longitude in arc seconds per year and the y value corresponds to the proper motion in ecliptical latitude in arc seconds per year.

Author(s)

C++ code by PJ Naughter, imported to R by Jinlong Zhang

References

Meeus, J. H. (1991). Astronomical algorithms. Willmann-Bell, Incorporated.

Examples

CAAPrecession_EquatorialPMToEcliptic(Alpha = 12.54, Delta = 10, 
    Beta = 67, PMAlpha = 0.01, PMDelta = 0.21, Epsilon = 0.1)

helixcn/skycalc documentation built on March 31, 2021, 5:45 a.m.