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FORS2 trending system: HISTORY report
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Last update: 2014-01-12T03:53:52 (UT)
same group: angle_offset pol_offset instr_pol
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*Date on this monitor changes at 21:00 UT
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Plot
?		 Symb
?		 Source
*		 Average ? Thresholds ? N_
data		 QC1
parameter		 Data
downloads		 Remarks
method value unit method value
1 .QC1DB none   degree VAL-5,5 21 angle_offset this | last_yr | all difference between measured angle and catalog angle for all bands
1 •QC1DB none   degree none  0 angle_offset this | last_yr | all difference between measured angle and catalog angle for the B band
1 ♦QC1DB none   degree none  0 angle_offset this | last_yr | all difference between measured angle and catalog angle for the V band
1 ▲QC1DB none   degree none  21 angle_offset this | last_yr | all difference between measured angle and catalog angle for the R band
1 ■QC1DB none   degree none  0 angle_offset this | last_yr | all difference between measured angle and catalog angle for the I band
2 .QC1DB none   degree none  21 err_angle_offset this | last_yr | all error of the difference between measured angle and catalog angle for all bands
2 •QC1DB none   degree none  0 err_angle_offset this | last_yr | all error of the difference between measured angle and catalog angle for the B band
2 ♦QC1DB none   degree none  0 err_angle_offset this | last_yr | all error of the difference between measured angle and catalog angle for the V band
2 ▲QC1DB none   degree none  21 err_angle_offset this | last_yr | all error of the difference between measured angle and catalog angle for the R band
2 ■QC1DB none   degree none  0 err_angle_offset this | last_yr | all error of the difference between measured angle and catalog angle for the I band
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:fors2_std_pmos
(QC1 database)
dataset:
(numbers below apply to this dataset)		angle_offset.
average:none
fixed thresholds:-5...5degree
N_data plotted:21
[click on plot for closeup]
Plot 2
data source:fors2_std_pmos
(QC1 database)
dataset:
(numbers below apply to this dataset)		err_angle_offset.
average:none
thresholds:none
N_data plotted:21
[click on plot for closeup]
This plot

For polarized standard stars the pipeline determines the difference between the measured angle and the angle tabulated in the catalogue. Since polarization parameters are usually tabulated for broad-band filters the pipeline selects the broad-band filter closest to the central wavelength of the grism.
Differences may indicate problems with the zero-points of the retarder plate angle position. Only data with an error of less than 10 degrees in angle offset are trended.  

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