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UVES trending system: HISTORY report
Last update: 2012-05-08T09:46:28 (UT)
same group: 346B_CD1 437B_CD2 580U_CD3 860U_CD4 580L_CD3 860L_CD4   Thermal_BLUE REDU REDL
close window history: 2000 2001 2002 2003 2004   2005   2006   2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022   HEALTH FULL
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*Date on this monitor changes at 21:00 UT
Print: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
Plot
?
Symb
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Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB MEAN 12.85173 [C] none   752 ins_temp1_mean this | last_yr | all Mean temperature of CAMERA
2 QC1DB MEAN 12.85173 [C] none   752 ins_temp1_mean this | last_yr | all temperature (repeated)
3 QC1DB MEAN 12.85173 [C] none   752 ins_temp1_mean this | last_yr | all temperature (repeated)
4 +QC1DB MEDIAN -2.265 [pix] none   132 mean_dx this | last_yr | all DX between solution and Physical Model, CD#1, 346nm, 1x1
5 +QC1DB MEDIAN 0.033 [pix] none   132 mean_dy this | last_yr | all DY between solution and Physical Model
6 +QC1DB MEDIAN 851.0 NONE none   132 nlin_sel this | last_yr | all Number of lines used in solution
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:uves_fmtchk
(QC1 database)
dataset:ins_temp1_mean
mean:12.85173[C]
thresholds:none 
N_data plotted:752
[click on plot for closeup]
Plot 2
data source:uves_fmtchk
(QC1 database)
dataset:ins_temp1_mean
mean:12.85173[C]
thresholds:none 
N_data plotted:752
[click on plot for closeup]
Plot 3
data source:uves_fmtchk
(QC1 database)
dataset:ins_temp1_mean
mean:12.85173[C]
thresholds:none 
N_data plotted:752
[click on plot for closeup]
Plot 4
data source:uves_fmtchk
(QC1 database)
dataset:mean_dx+
median:-2.265[pix]
thresholds:none 
N_data plotted:132
[click on plot for closeup]
Plot 5
data source:uves_fmtchk
(QC1 database)
dataset:mean_dy+
median:0.033[pix]
thresholds:none 
N_data plotted:132
[click on plot for closeup]
Plot 6
data source:uves_fmtchk
(QC1 database)
dataset:nlin_sel+
median:851.0NONE
thresholds:none 
N_data plotted:132
[click on plot for closeup]
This plot

This is the trending report for UVES QC parameters derived from the format check calibrations taken in wavelength setting 346 (BLUE or DICHR).

Calibrating SCIENCE observations made during the night with calibrations taken during the day relies on the stability and reproducibility of the positioning of the instrument components. To insure an accurate wavelength calibration, one of the critical criteria is the accuracy of the positioning of the gratings. If the highest possible accuracy is required for the wavelength calibration, an attached wavelength calibration should be taken with the science. Alternatively, since the exact grating position can not be measured in the science image itself, we rely on the daily health check format check data to verify the stability and reproducibility from day to day, assuming that this is a reaasonable indication of the reproducibility between nighttime science and daytime calibrations.

With this in mind the important aspects in these plots are the day to day scatter. The absolute level, within reason (i.e. plus or minus 10 pixels) is not important.

From time to time there are sudden jumps in the mean levels, often due to earthquakes, but often the cause of the jump is far from obvious. Such jumps are not in themselves a cause for immediate concern. Only if they are happening frequently, and liable to be happening during the night. Or if they take the instrument so far from the Physical Model that the pipeline will have serious difficulties to converge to a solution, as a rule of thumb, intervention to realign should be considered if the residuals exceed plus or minus 10 pixels.

The individual plots describe:

  1. average air temperature of the camera [C] (INS.TEMP4.NAME). Trends in the residuals correlate with temperature.
  2. same as 1
  3. same as 1
  4. the mean residual in X of the fitted position of the emission lines with respect to the positions expected from the Physical Model
  5. the mean residual in Y of the fitted position of the emission lines with respect to the positions expected from the Physical Model
  6. the number of emmision lines selected in the final solution. Trends in this parameter can be due to lamp aging effects (but not always...)

Find more information about UVES Grating Position monitoring here.  


General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow ( or )
  • you can download the data for each parameter set if the 'Data downloads' link shows up