ISAAC trending system: HISTORY plot
Last update: 2007-05-24T08:28:48 (UT)
same group: SW_extinct   FOV-grad SW-arm SW-band/LW-arm LW-arm
close window history: 2002 2003 2004 2005   2006   2007   2008 2009 2010 2011 2012 2013   HEALTH
  ... ... ... ... ... ... ... ... ...
*Date on this monitor changes at 21:00 UT
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  • Outliers in the gradient (dF/dx) are only meaningful when the RMS(dF/dy) is small, otherwise the deviation of dF/dx is due to a larger scatter in the measurement (e.g. non-photometric conditions, or high sky-variations). The same holds for dF/dy; here the RMS(dF/dx) should be low.
Plot Symbol
[info]		 Source* Average [info] Thresholds [info] N_data Data downloads Remarks
method value unit method value
1 ♦QC1DB none  ADU none   47 this | last_yr | all H-band: FOV gradient in x-direction of standard star flux
1 •QC1DB none  ADU none   49 this | last_yr | all Js-band: FOV gradient in x-direction of standard star flux
1 oQC1DB none  ADU none   46 this | last_yr | all J-band: FOV gradient in x-direction of standard star flux
1 [19]QC1DB none  ADU none   44 this | last_yr | all Ks-band: FOV gradient in x-direction of standard star flux
2 ♦QC1DB none  ADU none   47 this | last_yr | all H-band: FOV gradient in y-direction of standard star flux
2 •QC1DB none  ADU none   49 this | last_yr | all Js-band: FOV gradient in y-direction of standard star flux
2 oQC1DB none  ADU none   46 this | last_yr | all J-band: FOV gradient in y-direction of standard star flux
2 [19]QC1DB none  ADU none   44 this | last_yr | all Ks-band: FOV gradient in y-direction of standard star flux
3 ♦QC1DB none  ADU none   47 this | last_yr | all H-band: RMS in x-gradient
3 •QC1DB none  ADU none   49 this | last_yr | all Js-band: RMS in x-gradient
3 oQC1DB none  ADU none   46 this | last_yr | all J-band: RMS in x-gradient
3 [19]QC1DB none  ADU none   44 this | last_yr | all Ks-band: RMS in x-gradient
4 ♦QC1DB none  ADU none   47 this | last_yr | all H-band: RMS of y-gradient
4 •QC1DB none  ADU none   49 this | last_yr | all Js-band: RMS of y-gradient
4 oQC1DB none  ADU none   46 this | last_yr | all J-band: RMS of y-gradient
4 [19]QC1DB none  ADU none   44 this | last_yr | all Ks-band: RMS of y-gradient
*Data sources: OPSLOG: Paranal ops logs; QC1DB: QC1 database; LOCAL: local text file
This plot

This is the trending plot for the ISAAC QC parameters derived from photometric zeropoint frames. These plots describe:
1. The spatial gradient of the photometric zeropoint along the x-axis.
2. The spatial gradient of the photometric zeropoint along the y-axis.
3. The RMS of the gradient in x derived from the linear regression analysis
4. The RMS of the gradient in y derived from the linear regression analysis

The FOV gradients are derived from the five single raw frame exposures. Since the five measurements are acquired at five different positions on the detector, a simple spatial photometry can be derived for reasons of health check. These measurements serve as a quick look.

This QC check is complementory to the annualy acquired illumination checks. The illumination checks puts the star on a finer grid on the detetctor and fits a non-linear 2-dim polynomial. Find more information about ISAAC ZPOINT calibrations here.

Other QC parameters related to detector properties (like photometric zeropoints, linearity) 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