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ISAAC trending system: HISTORY plot
Last update: 2009-01-12T01:48:12 (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
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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
  • 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
?		 Symb
?		 Source
*		 Average ? Thresholds ? N_
data		 QC1
parameter		 Data
downloads		 Remarks
method value unit method value
1 ♦QC1DB MEDIAN -0.03167 ADU/pixel VAL-0.1,0.1 39 qc_grad_x this | last_yr | all H-band: FOV gradient in x-direction of standard star flux
1 •QC1DB MEDIAN -0.01642 ADU/pixel VAL-0.1,0.1 48 qc_grad_x this | last_yr | all Js-band: FOV gradient in x-direction of standard star flux
1 oQC1DB MEDIAN -0.02114 ADU/pixel VAL-0.1,0.1 38 qc_grad_x this | last_yr | all J-band: FOV gradient in x-direction of standard star flux
1 [19]QC1DB MEDIAN -0.02685 ADU/pixel VAL-0.1,0.1 50 qc_grad_x this | last_yr | all Ks-band: FOV gradient in x-direction of standard star flux
2 ♦QC1DB MEDIAN -0.02598 ADU/pixel VAL-0.1,0.1 39 qc_grad_y this | last_yr | all H-band: FOV gradient in y-direction of standard star flux
2 •QC1DB MEDIAN -0.02554 ADU/pixel VAL-0.1,0.1 48 qc_grad_y this | last_yr | all Js-band: FOV gradient in y-direction of standard star flux
2 oQC1DB MEDIAN -0.01735 ADU/pixel VAL-0.1,0.1 38 qc_grad_y this | last_yr | all J-band: FOV gradient in y-direction of standard star flux
2 [19]QC1DB MEDIAN -0.02288 ADU/pixel VAL-0.1,0.1 50 qc_grad_y this | last_yr | all Ks-band: FOV gradient in y-direction of standard star flux
3 ♦QC1DB MEDIAN 0.02369 ADU/pixel VAL0,0.075 39 qc_grad_dx this | last_yr | all H-band: RMS in x-gradient
3 •QC1DB MEDIAN 0.02666 ADU/pixel VAL0,0.075 48 qc_grad_dx this | last_yr | all Js-band: RMS in x-gradient
3 oQC1DB MEDIAN 0.01855 ADU/pixel VAL0,0.075 38 qc_grad_dx this | last_yr | all J-band: RMS in x-gradient
3 [19]QC1DB MEDIAN 0.02985 ADU/pixel VAL0,0.075 50 qc_grad_dx this | last_yr | all Ks-band: RMS in x-gradient
4 ♦QC1DB MEDIAN 0.02934 ADU/pixel VAL0,0.075 39 qc_grad_dy this | last_yr | all H-band: RMS of y-gradient
4 •QC1DB MEDIAN 0.0197 ADU/pixel VAL0,0.075 48 qc_grad_dy this | last_yr | all Js-band: RMS of y-gradient
4 oQC1DB MEDIAN 0.02007 ADU/pixel VAL0,0.075 38 qc_grad_dy this | last_yr | all J-band: RMS of y-gradient
4 [19]QC1DB MEDIAN 0.02871 ADU/pixel VAL0,0.075 50 qc_grad_dy this | last_yr | all Ks-band: RMS of y-gradient
*Data sources: 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