Description Usage Arguments Details Value Author(s) References See Also Examples

Calculate changes to right ascension and declination due to astronomical aberration

1 | ```
co_aberration(jd, ra, dec, eps)
``` |

`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), |

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

`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). |

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

R adaptation by Arnab Chakraborty (June 2013)

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

1 | ```
co_aberration(2456469.5,253.215,-32.449)
``` |

```
$d_ra
[1] 22.31268
$d_dec
[1] -3.324864
$eps
[1] 0.4090281
```

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