CAAPrecession_AdjustPositionUsingUniformProperMotion: CAAPrecession_AdjustPositionUsingUniformProperMotion

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

Description

CAAPrecession_AdjustPositionUsingUniformProperMotion

Usage

CAAPrecession_AdjustPositionUsingUniformProperMotion(t, Alpha, Delta, PMAlpha, PMDelta)

Arguments

t	t The number of years from the starting epoch, negative in the past and positive in the future.
Alpha	Alpha The right ascension expressed as an hour angle.
Delta	Delta The declination in degrees.
PMAlpha	PMAlpha The proper motion in right ascension in arc seconds per year.
PMDelta	PMDelta The proper motion in declination in arc seconds per year.

Value

Returns the converted equatorial coordinates in a CAA2DCoordinate class. The x value in the class corresponds to the right ascension expressed as an hour angle and the y value corresponds to the declination in degrees.

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_AdjustPositionUsingUniformProperMotion(t = 55, Alpha = 11.20, Delta = 45, PMAlpha = 1.22, PMDelta = 1.01)

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