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ISAAC trending system: HISTORY plot
Last update: 2010-12-30T21:19:49 (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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- 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 -0.03763 ADU/pixel VAL-0.1,0.1 17 qc_grad_x this | last_yr | all H-band: FOV gradient in x-direction of standard star flux
1 •QC1DB MEDIAN -0.01857 ADU/pixel VAL-0.1,0.1 18 qc_grad_x this | last_yr | all Js-band: FOV gradient in x-direction of standard star flux
1 oQC1DB MEDIAN -0.06184 ADU/pixel VAL-0.1,0.1 18 qc_grad_x this | last_yr | all J-band: FOV gradient in x-direction of standard star flux
1 ■QC1DB MEDIAN -0.01214 ADU/pixel VAL-0.1,0.1 19 qc_grad_x this | last_yr | all Ks-band: FOV gradient in x-direction of standard star flux
2 ♦QC1DB MEDIAN -0.01892 ADU/pixel VAL-0.1,0.1 17 qc_grad_y this | last_yr | all H-band: FOV gradient in y-direction of standard star flux
2 •QC1DB MEDIAN -0.0146 ADU/pixel VAL-0.1,0.1 18 qc_grad_y this | last_yr | all Js-band: FOV gradient in y-direction of standard star flux
2 oQC1DB MEDIAN -0.00487 ADU/pixel VAL-0.1,0.1 18 qc_grad_y this | last_yr | all J-band: FOV gradient in y-direction of standard star flux
2 ■QC1DB MEDIAN -0.03447 ADU/pixel VAL-0.1,0.1 19 qc_grad_y this | last_yr | all Ks-band: FOV gradient in y-direction of standard star flux
3 ♦QC1DB MEDIAN 0.01993 ADU/pixel VAL0,0.075 17 qc_grad_dx this | last_yr | all H-band: RMS in x-gradient
3 •QC1DB MEDIAN 0.01951 ADU/pixel VAL0,0.075 18 qc_grad_dx this | last_yr | all Js-band: RMS in x-gradient
3 oQC1DB MEDIAN 0.01146 ADU/pixel VAL0,0.075 18 qc_grad_dx this | last_yr | all J-band: RMS in x-gradient
3 ■QC1DB MEDIAN 0.04165 ADU/pixel VAL0,0.075 19 qc_grad_dx this | last_yr | all Ks-band: RMS in x-gradient
4 ♦QC1DB MEDIAN 0.03454 ADU/pixel VAL0,0.075 17 qc_grad_dy this | last_yr | all H-band: RMS of y-gradient
4 •QC1DB MEDIAN 0.02408 ADU/pixel VAL0,0.075 18 qc_grad_dy this | last_yr | all Js-band: RMS of y-gradient
4 oQC1DB MEDIAN 0.0595 ADU/pixel VAL0,0.075 18 qc_grad_dy this | last_yr | all J-band: RMS of y-gradient
4 ■QC1DB MEDIAN 0.05902 ADU/pixel VAL0,0.075 19 qc_grad_dy this | last_yr | all Ks-band: RMS of y-gradient
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:isaac_zp
(QC1 database)
parameter | dataset:
(numbers applicable to ♦ )		qc_grad_x♦
median:-0.03763ADU/pixel
fixed thresholds:-0.1...0.1ADU/pixel
N_data:17
[click on plot for closeup]
Plot 2
data source:isaac_zp
(QC1 database)
parameter | dataset:
(numbers applicable to ♦ )		qc_grad_y♦
median:-0.01892ADU/pixel
fixed thresholds:-0.1...0.1ADU/pixel
N_data:17
[click on plot for closeup]
Plot 3
data source:isaac_zp
(QC1 database)
parameter | dataset:
(numbers applicable to ♦ )		qc_grad_dx♦
median:0.01993ADU/pixel
fixed thresholds:0.0...0.075ADU/pixel
N_data:17
[click on plot for closeup]
Plot 4
data source:isaac_zp
(QC1 database)
parameter | dataset:
(numbers applicable to ♦ )		qc_grad_dy♦
median:0.03454ADU/pixel
fixed thresholds:0.0...0.075ADU/pixel
N_data:17
[click on plot for closeup]
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