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chara:fringe_offsets [2019/06/04 13:39] gail_stargazer |
chara:fringe_offsets [2023/08/30 16:17] gail_stargazer |
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The fringe offsets on any given night will depend on the POP configuration and the daily alignment. The table below gives a range of values where the fringes have been found for each cart on multiple nights across different POP configurations. The ranges should at least provide a guide for how far one might need to look to find fringes. The relative offsets between any pair of telescopes can be calculated from the differences between the ranges. | The fringe offsets on any given night will depend on the POP configuration and the daily alignment. The table below gives a range of values where the fringes have been found for each cart on multiple nights across different POP configurations. The ranges should at least provide a guide for how far one might need to look to find fringes. The relative offsets between any pair of telescopes can be calculated from the differences between the ranges. | ||
+ | A new baseline solution was created on 2023Jun28 and has been set as the default. The solution is based on mircx/ | ||
+ | |||
+ | S1: -0.1 mm to +0.4 mm\\ | ||
+ | S2: -0.6 mm to +0.2 mm\\ | ||
+ | E1: -0.6 mm to +0.6 mm\\ | ||
+ | E2: -0.3 mm to +0.3 mm\\ | ||
+ | W1: -0.6 mm to +0.4 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The new solution is stored as the following backup file (also copied to telescopes.chara): | ||
+ | / | ||
+ | |||
+ | Load previous solution using the following command in ople:\\ | ||
+ | initast / | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ---- | ||
+ | |||
+ | A new baseline solution was created on 2023Aug29 and has been set as the default. The solution is based on mircx/ | ||
+ | |||
+ | S1: -0.8 mm to +0.1 mm\\ | ||
+ | S2: -0.6 mm to -0.4 mm\\ | ||
+ | E1: -0.8 mm to +0.3 mm\\ | ||
+ | E2: -0.3 mm to +0.4 mm\\ | ||
+ | W1: -0.2 mm to +0.4 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The new solution is stored as the following backup file (also copied to telescopes.chara): | ||
+ | / | ||
+ | |||
+ | Load previous solution using the following command in ople:\\ | ||
+ | initast / | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ---- | ||
+ | |||
+ | A new baseline solution was created on 2023May10 and has been set as the default. The solution is based on several nights of mircx/ | ||
+ | |||
+ | S1: -0.8 mm to +1.4 mm\\ | ||
+ | S2: -1.2 mm to +0.7 mm\\ | ||
+ | E1: -0.4 mm to +0.6 mm\\ | ||
+ | E2: -0.9 mm to +0.3 mm\\ | ||
+ | W1: -1.0 mm to +0.8 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The new solution is stored as the following backup file (also copied to telescopes.chara): | ||
+ | / | ||
+ | |||
+ | Load previous solution using the following command in ople:\\ | ||
+ | initast / | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ---- | ||
+ | |||
+ | A new baseline solution was created on 2023Feb20 and has been set as the default. The solution is based on mircx/ | ||
+ | |||
+ | S1: -2.3 mm to -0.6 mm\\ | ||
+ | S2: -2.3 mm to -1.0 mm\\ | ||
+ | E1: 0.7 mm to +2.8 mm\\ | ||
+ | E2: -1.0 mm to +3.0 mm\\ | ||
+ | W1: 1.7 mm to +6.2 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The new solution is stored as the following backup file (also copied to telescopes.chara): | ||
+ | / | ||
+ | |||
+ | Load previous solution using the following command in ople:\\ | ||
+ | initast / | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ---- | ||
+ | |||
+ | A new baseline solution was created on 2022Sep07 and has been set as the default. The solution is based on mircx/ | ||
+ | |||
+ | S1: -0.9 mm to -0.1 mm\\ | ||
+ | S2: -1.2 mm to +0.7 mm\\ | ||
+ | E1: -1.1 mm to +0.4 mm\\ | ||
+ | E2: -1.1 mm to +0.9 mm\\ | ||
+ | W1: -1.4 mm to +0.2 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The new solution is stored as the following backup file (also copied to telescopes.chara): | ||
+ | / | ||
+ | |||
+ | Load previous solution using the following command in ople:\\ | ||
+ | initast / | ||
+ | |||
+ | A new baseline solution was created on 2022Jun18 and has been set as the default. | ||
+ | |||
+ | S1: -0.7 mm to +0.5 mm\\ | ||
+ | S2: -2.6 mm to +0.7 mm\\ | ||
+ | E1: -0.3 mm to +0.4 mm\\ | ||
+ | E2: -0.3 mm to +0.5 mm\\ | ||
+ | W1: -3.8 mm to +0.4 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | {{: | ||
+ | |||
+ | A new baseline solution was created on 2022May19 and has been in use since 2022May22. There seems to be a small dependence on elevation for some of the telescopes. | ||
+ | |||
+ | S1: -1 mm on pop1 down to -6 mm on pop5 [note S1 optics removed and put back in for recoating]\\ | ||
+ | S2: -0.8 mm to +0.3 mm\\ | ||
+ | E1: -0.1 mm to +1.8 mm\\ | ||
+ | E2: -0.7 mm to +0.9 mm\\ | ||
+ | W1: +1.4 mm to +1.7 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | {{: | ||
+ | |||
+ | A new baseline solution was created on 2022Mar21 and has been in use since 2022Apr03. | ||
+ | |||
+ | S1: -2.1 mm to 1.5 mm\\ | ||
+ | S2: -0.8 mm to +0.6 mm\\ | ||
+ | E1: +0.1 mm to +1.5 mm\\ | ||
+ | E2: -0.1 mm to +3.5 mm\\ | ||
+ | W1: +1.1 mm to +2.9 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | {{: | ||
+ | |||
+ | Starting in 2022, it seems the baseline solution has drifted, and the offsets are again trending negative with increasing hour angle. Here are the ranges of recent offsets from March 2022 (look on the positive side of these ranges for early (-) hour angles and toward the negative side for late (+) hour angles): | ||
+ | |||
+ | S1: -0.5 mm to 3.8 mm\\ | ||
+ | S2: -1.5 mm to +2.6 mm\\ | ||
+ | E1: +1.5 mm to +4.4 mm\\ | ||
+ | E2: -3.0 mm to +4.0 mm\\ | ||
+ | W1: -0.5 mm to +4.5 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | (hour angle +3 hr on negative side, hour angle -2 hr on positive side) | ||
+ | |||
+ | A new baseline solution was created on October 18, 2021 and accounts for changes in elevation. The offsets are more stable over the night, but there seems to be some differences between pop configurations. There is a new fringe predictor tool that plots offsets for the last 5 nights based on mircx headers. Log on to spooler@mircx and type " | ||
+ | |||
+ | S1: -0.2 mm to +1.2 mm\\ | ||
+ | S2: -0.6 mm to +0.8 mm\\ | ||
+ | E1: 0.5 mm to +2.0 mm\\ | ||
+ | E2: -0.2 mm to +1.6 mm\\ | ||
+ | W1: 1.0 mm to +3.0 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | The offsets on S2 changed after the primary mirror recoating and realignment in September 2021. We are still using the baseline solution created July 29, 2021. The fringe offsets change rapidly with hour angle of the target. Early hour angles tend to have more negative offsets, positive hour angles tend to have more positive offsets. {{: | ||
+ | |||
+ | S1: -2.5 mm to +1.0 mm\\ | ||
+ | S2: -1.2 mm to +2.4 mm\\ | ||
+ | E1: -2.4 mm to +1.0 mm\\ | ||
+ | E2: -2.8 mm to +1.2 mm\\ | ||
+ | W1: -3.5 mm to +0.8 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | A new baseline solution was created on July 29, 2021. The fringe offsets continue to change rapidly over time depending on hour angle. See {{: | ||
+ | |||
+ | S1: -2.5 mm to +1.0 mm\\ | ||
+ | S2: -2.0 mm to +0.6 mm\\ | ||
+ | E1: -1.8 mm to +0.9 mm\\ | ||
+ | E2: -1.5 mm to +1.0 mm\\ | ||
+ | W1: -1.5 mm to +0.8 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | Fringe offsets during 6T MIRCX observations in 2021 Mar-Apr (W2 as reference cart): For the current baseline solution, the fringe offsets change rapidly depending on hour angle. See {{: | ||
+ | |||
+ | S1: -2.0 mm to +2.0 mm\\ | ||
+ | S2: -2.0 mm to +2.0 mm\\ | ||
+ | E1: +0.0 mm to +3.0 mm\\ | ||
+ | E2: +0.0 mm to +3.0 mm\\ | ||
+ | W1: -1.5 mm to +2.0 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | Fringe offsets during 6T MIRCX observations in 2020 June (W2 as reference cart): | ||
+ | |||
+ | S1: -0.7 mm to +1.1 mm\\ | ||
+ | S2: -0.2 mm to +0.6 mm\\ | ||
+ | E1: +0.2 mm to +0.8 mm\\ | ||
+ | E2: +0.6 mm to +1.6 mm\\ | ||
+ | W1: +0.8 mm to +1.3 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | Fringe offsets during 6T MIRCX observations in 2019 July-August (W2 as reference cart): | ||
+ | |||
+ | S1: -1.3 mm to +0.2 mm\\ | ||
+ | S2: -1.1 mm to +0.2 mm\\ | ||
+ | E1: -2.0 mm to +0.5 mm\\ | ||
+ | E2: -0.8 mm to +0.7 mm\\ | ||
+ | W1: -0.6 mm to +0.2 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | Fringe offsets during 6T MIRCX observations in 2019 July (W2 as reference cart): | ||
+ | |||
+ | S1: -0.8 mm to +0.2 mm\\ | ||
+ | S2: -0.6 mm to +0.2 mm\\ | ||
+ | E1: -1.1 mm to +0.5 mm\\ | ||
+ | E2: -0.4 mm to +0.6 mm\\ | ||
+ | W1: -0.2 mm to +0.2 mm\\ | ||
+ | W2: Reference Cart | ||
+ | |||
+ | NOTE: Theo installed a new baseline solution on 2019Jun26. This is based on Aaron' | ||
+ | \\ | ||
Fringe offsets during 6T MIRCX observations on 2019 May 31 - June 2 (W2 as reference cart): | Fringe offsets during 6T MIRCX observations on 2019 May 31 - June 2 (W2 as reference cart): | ||