## PointingModelOffsets » History » Version 9

*Lucas Beaufore, 07/12/2013 12:28 PM *

1 | 1 | Lucas Beaufore | h1. Pointing Model Offsets |
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2 | 1 | Lucas Beaufore | |

3 | 1 | Lucas Beaufore | In order to study the effects the pointing model may have on the offsets, new offsets were calculated with possible corrections from the effects of the hexapod trim values. |

4 | 2 | Lucas Beaufore | |

5 | 2 | Lucas Beaufore | The following histograms show the distribution of the offsets before trim corrections, and with a trim correction of both addition and subtraction. |

6 | 2 | Lucas Beaufore | |

7 | 2 | Lucas Beaufore | |

8 | 3 | Lucas Beaufore | RA offset with: No correction, addition of a scaled (.0176 arcsec/micron) trim_dy value, subtraction of the scaled trim_dy value |

9 | 3 | Lucas Beaufore | |

10 | 2 | Lucas Beaufore | |!{width:100%}dec_standard.png! |!{width:100%}dec_corrected_y.png! | |!{width:100%}dec_corrected_minus_y.png! | |

11 | 3 | Lucas Beaufore | |

12 | 3 | Lucas Beaufore | Dec offset with: No correction, addition of a scaled (.0176 arcsec/micron) trim_dx value, subtraction of the scaled trim_dx value |

13 | 3 | Lucas Beaufore | |

14 | 2 | Lucas Beaufore | |!{width:100%}ra_standard.png! |!{width:100%}ra_corrected_x.png! | |!{width:100%}ra_corrected_minus_x.png! | |

15 | 4 | Lucas Beaufore | |

16 | 4 | Lucas Beaufore | The effect of the corrections are arguably more visible on a 3D plot. The following show the tweak values and exposure ID values (essentially time, in order to better show the exposure groups) |

17 | 6 | Lucas Beaufore | versus the offsets. |

18 | 1 | Lucas Beaufore | |

19 | 6 | Lucas Beaufore | Blue = Original offsets |

20 | 6 | Lucas Beaufore | Green = Original offsets + (.0176 * trim) |

21 | 6 | Lucas Beaufore | Red = Original offsets + (.0176 * trim) |

22 | 6 | Lucas Beaufore | |

23 | 1 | Lucas Beaufore | Declination offsets vs trim_dy (vs expid): |

24 | 1 | Lucas Beaufore | |

25 | 9 | Lucas Beaufore | |!{width:100%}dec_all_corrections_back.png! | !{width:100%}dec_all_corrections_side.png! | |

26 | 5 | Lucas Beaufore | |

27 | 6 | Lucas Beaufore | RA offsets vs trim_dx (vs expid): |

28 | 7 | Lucas Beaufore | |!{width:70%}ra_all_corrections_side.png! | |