co_aberration: Calculate changes to right ascension and declination due to...

In astrolibR: Astronomy Users Library

Description

Calculate changes to right ascension and declination due to astronomical aberration

Usage

co_aberration(jd, ra, dec, eps)

Arguments

jd	Julian Date [scalar or vector]
ra	right ascension, in degrees (scalar or N-vector)
dec	declination, in degrees (scalar or N-vector)
eps	true obliquity of the ecliptic, in radians (optional),

Details

Algorithm described in Meeus (1991), Chap 23. Accuracy is much better than 1 arcsecond.

Value

d_ra	corrections to ra due to aberration (must then be added to ra to get corrected values).
d_dec	corrections to dec due to aberration (must then be added to dec to get corrected values).
eps	true obliquity of the ecliptic (in radians).

Author(s)

Original IDL program by Chris O'Dell, U. of Wisconsin (June 2002)

R adaptation by Arnab Chakraborty (June 2013)

References

Meeus, J., Astronomical Algorithms, Willmann-Bell, 1991

See Also

co_refract

Examples

co_aberration(2456469.5,253.215,-32.449)

Example output

$d_ra
[1] 22.31268

$d_dec
[1] -3.324864

$eps
[1] 0.4090281

astrolibR documentation built on May 2, 2019, 3:26 a.m.