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chara:fringe_offsets [2019/08/13 07:10] gail_stargazer |
chara:fringe_offsets [2021/06/02 19:38] 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. | ||
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+ | Fringe offsets during 6T MIRCX observations in Mar-Apr 2021 (W2 as reference cart): The current fringe offsets change rapidly depending on hour angle. See plot of cart offset vs. hour angle. | ||
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+ | 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 | ||
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+ | Fringe offsets during 6T MIRCX observations in 2020 June (W2 as reference cart): | ||
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+ | 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): | Fringe offsets during 6T MIRCX observations in 2019 July-August (W2 as reference cart): |