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chara:fringe_offsets [2025/06/10 15:16]
gail_stargazer 		chara:fringe_offsets [2025/06/17 19:30] (current)
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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 2025Jun03 and has been set as the default on UT 2025Jun04. The solution is based on observations from UT 2024Feb28 through 2025Jun03. It was created using the IDL routine compute_baseline_solution.pro and weighting by time. The following links shows {{:chara:files:baseline_offsets_2025_jun_04_05.pdf|plots of the residuals}}.+A new baseline solution was created on 2025Jun11 and has been set as the default on UT 2025Jun12. The solution is based on observations from UT 2025Feb21 through 2025Jun11. It was created using the IDL routine compute_baseline_solution.pro and weighting. The following links shows {{:chara:files:baseline_solution_2025feb21_2025jun11.pdf|plots of the residuals}}.
  
-S1: -0.16 mm to +3.19 mm\\ +S1: -0.72 mm to +1.75 mm\\ 
-S2: -0.29 mm to +2.63 mm\\ +S2: -1.05 mm to +0.76 mm\\ 
-E1: -0.21 mm to +4.74 mm\\+E1: -1.53 mm to +0.46 mm\\ 
 +E2: -0.66 mm to +1.29 mm\\ 
 +W1: +1.04 mm to +1.86 mm\\ 
 +W2: Reference Cart 
 + 
 +The new solution is stored as the following backup file (also copied to telescopes.chara):\\ 
 +/ctrscrut/chara/etc/telescopes.chara.2025_06_11 
 + 
 +Load previous solution using the following command in ople:\\ 
 +initast /ctrscrut/chara/etc/telescopes.chara.2025_06_03_weight 
 + 
 +{{:chara:files:baseline_offsets_2025_jun_12_17.pdf|Offsets plotted against hour angle, elevation, and time for UT 2025 Jun 12-17.}} 
 + 
 +---- 
 + 
 +A new baseline solution was created on 2025Jun03 and has been set as the default on UT 2025Jun04. The solution is based on observations from UT 2024Feb28 through 2025Jun03. It was created using the IDL routine compute_baseline_solution.pro and weighting by time. The following links shows {{:chara:files:baseline_solution_2024feb28_2025jun03_tweight.pdf|plots of the residuals}}. 
 + 
 +S1: +0.80 mm to +3.19 mm\\ 
 +S2: +0.90 mm to +2.63 mm\\ 
 +E1: +1.0 mm to +4.74 mm\\
 E2: +1.37 mm to +4.65 mm\\ E2: +1.37 mm to +4.65 mm\\
 W1: -2.60 mm to +3.23 mm\\ W1: -2.60 mm to +3.23 mm\\
 W2: Reference Cart W2: Reference Cart
 +
 +The new solution is stored as the following backup file (also copied to telescopes.chara):\\
 +/ctrscrut/chara/etc/telescopes.chara.2025_06_03_weight
 +
 +Load previous solution using the following command in ople:\\
 +initast /ctrscrut/chara/etc/telescopes.chara.2025_05_07
 +
 +{{:chara:files:baseline_offsets_2025_jun_04_10.pdf|Offsets plotted against hour angle, elevation, and time for UT 2025 Jun 04 - 10.}}
  
 ---- ----
chara/fringe_offsets.1749582991.txt.gz · Last modified: 2025/06/10 15:16 by gail_stargazer

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