QA for run 4233 (rerun 40, strip 39S), fields: 18-42

Data reduced with astrom v3_7 and photo v5_4_26
QA (version 2.3.4) produced by jen_a on Fri Apr 20 20:30:45 CDT 2007
Note that entries in the first column are linked to PS plots

Click here for the summary table.

Table of Contents

  • Field Quality Statistics
  • Principal Color Distributions
  • Background Brightness Analysis
  • PSF Photometry
  • Relative Astrometry
  • Flatfield Errors and Data Files

    • Field Quality Statistics


    Summary of Field Quality Table Entries
    BAD: photometry very bad (>0.05 mag) in at least one band, or r band seeing > 3 arcsec
    ACCEPTABLE: average, or below average, photometry (<0.05 mag)
    GOOD: average, or above average, photometry (<0.03 mag)
    EXCELLENT: photometry exceptionally good (<0.02 mag), and seeing < 2 arcsec

    Field Quality Statistics
    Quantity: BAD ACCEPTABLE GOOD EXCELLENT
    col. 1 0.040 0.120 0.280 0.560
    col. 2 0.000 0.000 0.160 0.840
    col. 3 0.040 0.000 0.160 0.800
    col. 4 0.000 0.080 0.160 0.760
    col. 5 0.000 0.000 0.120 0.880
    col. 6 0.000 0.000 0.080 0.920
    mean value 0.013 0.033 0.160 0.793

    *Red entries are triggered by entry < 0 0 0 0
    or entry > 0.1 0.5 1 1
    Legend:
    The links in the first column point to data files which list:
    run rerun camCol field opdbQAflag PSPstatus(u-z) PSFwidth(u-z) median(ap7-psf)(u-z) rms(ap7-psf)(u-z)
    For relevant plots go to PSF Photometry Section

    Here is the QAwizhard's Field Quality Table


    Principal Color Distributions

    This analysis tests the photometric accuracy and stability

    For implied photometric zeropoint errors please see the summary file


    Summary of Principal Color Table Entries
    Median - the median (for all bins) of the median (for bin) PC color
    Max|PC| - maximum excursion from the above median
    Rms - the rms scatter of the median PC color (per bin)
    Width - the median of the rms scatter (per bin)
    MaxWidth - the maximum value of the width normalized by the above median
    Nall - Total number of stars per bin
    NblueTail - Number of stars in the blue tail (>2 sigma bluer than median)
    NredTail - Number of stars in the red tail (>2 sigma redder than median)

    The s color distribution

    s=-0.249u+0.794g-0.555r+0.234

    The s color distribution
    Quantity: Median Max|PC| Rms Width MaxWidth Nall NblueTail NredTail
    col. 1 -0.021* 0.012 0.006 0.026 1.10 238 6 2
    col. 2 -0.006 0.008 0.005 0.027 1.16 259* 4 6
    col. 3 -0.001 0.007 0.004 0.026 1.11 266* 4 5
    col. 4 -0.015* 0.008 0.004 0.028 1.09 270* 6 6
    col. 5 -0.016* 0.005 0.002 0.028 1.11 274* 6 5
    col. 6 -0.010 0.007 0.004 0.027 1.16 292* 8 4
    mean value -0.011* 0.008 0.004 0.027 1.122 266.500* 5.667 4.667

    *Red entries are triggered by entry < -0.01 0 0.0 0.0 0 0 0 0
    or entry > 0.01 0.03 0.015 0.06 1.75 250 50 50
    Legend:
    s color is perpendicular to the stellar locus in the g-r vs. u-g diagram
    Blue tail is selected by s < -0.06 and red tail by s > 0.06 (for all r < 19)
    Rms is the scatter around the median, Width is the median locus width
    The links in the first column are for the cmd and cc diagrams
    Click here for the main s color plot.

    The w color distribution

    w=-0.227g+0.792r-0.567i+0.050

    The w color
    Quantity: Median Max|PC| Rms Width MaxWidth Nall NblueTail NredTail
    col. 1 0.004 0.003 0.001 0.020 1.13 436* 6 5
    col. 2 -0.001 0.006 0.003 0.023 1.05 444* 8 7
    col. 3 -0.011* 0.004 0.002 0.020 1.09 446* 4 6
    col. 4 0.001 0.005 0.002 0.021 1.09 464* 6 6
    col. 5 0.003 0.005 0.003 0.021 1.11 461* 6 6
    col. 6 -0.004 0.004 0.002 0.020 1.21 478* 4 6
    mean value -0.001 0.005 0.002 0.021 1.113 454.833* 5.667 6.000

    *Red entries are triggered by entry < -0.01 0 0.0 0.0 0 0 0 0
    or entry > 0.01 0.02 0.01 0.05 1.75 400 50 50
    Legend:
    w color is perpendicular to the blue stellar locus in the r-i vs. g-r diagram
    Blue tail is selected by w < -0.05 and red tail by w > 0.05 (for all r < 19)
    Rms is the scatter around the median, Width is the median locus width
    The links in the first column are for the cmd and cc diagrams
    Click here for the main w color plot.

    The x color distribution

    x=0.707g-0.707r-0.983

    The x color
    Quantity: Median Max|PC| Rms Width MaxWidth Nall NblueTail NredTail
    col. 1 -0.019* 0.014 0.006 0.034 1.40 40 1 1
    col. 2 0.001 0.010 0.006 0.038 1.01 45 0 0
    col. 3 0.002 0.011 0.008 0.035 1.40 42 1 0
    col. 4 -0.009 0.010 0.008 0.036 1.17 42 1 0
    col. 5 -0.005 0.017 0.008 0.039 1.16 44 0 2
    col. 6 -0.003 0.005 0.003 0.037 1.17 36 2 0
    mean value -0.005 0.011 0.006 0.036 1.218 41.500 0.833 0.500

    *Red entries are triggered by entry < -0.01 0 0.0 0.0 0 0 0 0
    or entry > 0.01 0.04 0.02 0.08 1.75 100 30 30
    Legend:
    x color is perpendicular to the red stellar locus in the r-i vs. g-r diagram
    Blue tail is selected by x < -0.08 and red tail by x > 0.08 (for all r < 19)
    Rms is the scatter around the median, Width is the median locus width
    The links in the first column are for the cmd and cc diagrams
    Click here for the main x color plot.

    The y color distribution

    y=-0.270r+0.800i-0.534z+0.059

    The y color
    Quantity: Median Max|PC| Rms Width MaxWidth Nall NblueTail NredTail
    col. 1 -0.001 0.008 0.006 0.019 1.12 104 0 0
    col. 2 -0.003 0.008 0.004 0.021 1.10 118 0 0
    col. 3 -0.002 0.011 0.005 0.021 1.20 112 0 1
    col. 4 -0.008 0.006 0.003 0.020 1.24 119 1 1
    col. 5 -0.013* 0.011 0.005 0.019 1.31 114 0 0
    col. 6 -0.009 0.006 0.004 0.021 1.10 103 0 0
    mean value -0.006 0.008 0.005 0.020 1.178 111.667 0.167 0.333

    *Red entries are triggered by entry < -0.01 0 0.0 0.0 0 0 0 0
    or entry > 0.01 0.02 0.01 0.06 1.75 200 50 50
    Legend:
    y color is perpendicular to the stellar locus in the i-z vs. r-i diagram
    Blue tail is selected by y < -0.06 and red tail by y > 0.06 (for all r < 19)
    Rms is the scatter around the median, Width is the median locus width
    The links in the first column are for the cmd and cc diagrams
    Click here for the main y color plot.

    Background Brightness Analysis

    Phot. Zeropoint Corr. for Flat Sky
    band:ugriz
    col. 1 0.006 0.010 -0.003 -0.015 -0.010
    col. 2 -0.001 0.012 0.030 0.018 0.015
    col. 3 -0.006 -0.002 0.021 0.003 0.015
    col. 4 -0.001 -0.003 -0.008 -0.004 -0.001
    col. 5 -0.017 0.002 0.007 0.012 0.009
    col. 6 -0.032* -0.018 -0.010 -0.013 -0.021

    *Red entries are triggered by abs(entry) > (0.03 0.03 0.03 0.03 0.03) in (u g r i z)
    The table above lists the differences between the median sky value
    in each column and the median of all 6 medians. The values
    ARE CORRECTED for differences in bandpasses.

    Sky: RMS
    band:ugriz
    col. 1 0.000 0.000 0.000 0.000 0.000
    col. 2 0.000 0.000 0.000 0.000 0.000
    col. 3 0.000 0.000 0.000 0.000 0.000
    col. 4 0.000 0.000 0.000 0.000 0.000
    col. 5 0.000 0.000 0.000 0.000 0.000
    col. 6 0.000 0.000 0.000 0.000 0.000
    mean value 0.000 0.000 0.000 0.000 0.000

    The table above lists the rms scatter of the corrected sky as a function
    of time, around the median of all 6 columns. The sky is
    corrected by the values from the table "Col2Col corr. from Sky"

    Sky: Max Dev
    band:ugriz
    col. 1 0.006 0.000 0.002 0.004 0.002
    col. 2 0.003 0.000 0.002 0.006 0.000
    col. 3 0.000 0.001 0.001 0.001 0.003
    col. 4 0.000 0.000 0.001 0.002 0.003
    col. 5 0.000 0.000 0.001 0.001 0.001
    col. 6 0.001 0.001 0.002 0.002 0.003
    max(abs) 0.006 0.001 0.002 0.006 0.003

    The table above lists the maximum deviation of the corrected sky as
    a function of time, from the median of all 6 columns. The sky
    is corrected by the values from the table "Col2Col corr. from Sky"

    PSF Photometry

    PSF magnitudes vs. aperture magnitudes

    m(apert7)-m(psf): Max Dev
    band:ugriz
    col. 1 0.090 0.027 0.011 0.019 0.038
    col. 2 0.016 0.017 0.011 0.026 0.023
    col. 3 0.052 0.016 0.017 0.017 0.022
    col. 4 0.036 0.015 0.011 0.021 0.033
    col. 5 0.027 0.006 0.016 0.014 0.020
    col. 6 0.022 0.011 0.013 0.014 0.022
    max(abs) 0.090 0.027 0.017 0.026 0.038

    The table above lists the maximum deviation of
    m(apert7)-m(psf) from the median for the whole run
    The fields known to be bad are masked.

    m(apert7)-m(psf): Med Off
    band:ugriz
    col. 1 -0.010 -0.005 0.002 0.010 0.015*
    col. 2 -0.002 -0.003 0.004 0.009 -0.000
    col. 3 -0.015* -0.001 0.000 0.003 0.008
    col. 4 -0.008 0.000 0.002 0.006 0.005
    col. 5 -0.007 0.000 0.003 0.002 0.005
    col. 6 -0.012* 0.001 0.004 0.007 0.009
    max(abs) 0.015* 0.005 0.004 0.010 0.015*

    *Red entries are triggered by abs(entry) > (0.01 0.01 0.01 0.01 0.01) in (u g r i z)
    The table above lists the median offset of m(apert7)-m(psf)
    from the median for the whole run

    m(apert7)-m(psf): RMS
    band:ugriz
    col. 1 0.018 0.006 0.005 0.006 0.013
    col. 2 0.006 0.006 0.004 0.010 0.011
    col. 3 0.010 0.005 0.005 0.005 0.009
    col. 4 0.010 0.006 0.004 0.006 0.011
    col. 5 0.010 0.003 0.005 0.006 0.006
    col. 6 0.008 0.004 0.004 0.005 0.007
    mean value 0.010 0.005 0.005 0.006 0.009

    The table above lists the rms scatter of m(apert7)-m(psf)
    around the median for the whole run

    PSF magnitudes vs. model magnitudes

    m(mod)-m(psf): Max Dev
    band:ugriz
    col. 1 0.036 0.015 0.011 0.007 0.010
    col. 2 0.014 0.016 0.013 0.014 0.010
    col. 3 0.022 0.010 0.019 0.016 0.009
    col. 4 0.010 0.013 0.009 0.007 0.005
    col. 5 0.010 0.014 0.013 0.010 0.007
    col. 6 0.018 0.011 0.005 0.007 0.008
    max(abs) 0.036 0.016 0.019 0.016 0.010

    The table above lists the maximum deviation of
    m(mod)-m(psf) from the median for the whole run
    The fields known to be bad are masked,

    m(mod)-m(psf): Med Off
    band:ugriz
    col. 1 -0.004 -0.005 -0.002 -0.003 -0.004
    col. 2 -0.003 -0.005 -0.001 -0.002 -0.002
    col. 3 -0.005 -0.004 -0.002 -0.003 -0.001
    col. 4 -0.001 -0.003 -0.001 -0.001 -0.002
    col. 5 -0.001 -0.004 -0.001 -0.002 -0.004
    col. 6 -0.005 -0.003 -0.001 -0.004 -0.003
    max(abs) 0.005 0.005 0.002 0.004 0.004

    The table above lists the median offset of m(mod)-m(psf)
    from the median for the whole run

    m(mod)-m(psf): RMS
    band:ugriz
    col. 1 0.008 0.004 0.003 0.002 0.003
    col. 2 0.003 0.004 0.004 0.004 0.003
    col. 3 0.004 0.003 0.005 0.004 0.002
    col. 4 0.004 0.004 0.003 0.002 0.002
    col. 5 0.004 0.003 0.003 0.003 0.002
    col. 6 0.005 0.003 0.003 0.002 0.002
    mean value 0.005 0.004 0.004 0.003 0.002

    The table above lists the rms scatter of m(mod)-m(psf)
    around the median for the whole run

    Relative Astrometry

    The Band-to-band Astrometric Accuracy


    The links in the first column are for astrometric error histograms

    The Band-to-band Astrometric Accuracy
    Quantity: rowMed rowSig rowT3 rowChi colMed colSig colT3 colChi
    col. 1 0.0 22.8 5.9 0.668 0.0 28.3 4.2 0.724
    col. 2 0.0 23.7 5.4 0.730 0.0 26.8 4.3 0.745
    col. 3 0.0 23.2 4.2 0.704 0.0 25.1 4.3 0.684
    col. 4 -3.2 24.2 4.5 0.729 0.0 25.0 4.1 0.710
    col. 5 0.0 23.8 4.8 0.750 0.0 25.3 4.0 0.713
    col. 6 0.0 25.1 4.6 0.727 0.0 26.9 6.4 0.704
    mean abs(value) 0.533 23.800 4.900 0.718 0.000 26.233 4.550 0.713

    *Red entries are triggered by abs(entry) > 50 50 100 3 50 50 100 3
    Legend:
    The errors in relative astrometry (band-to-band, NOT per coordinate) are computed
    from velocities for stars, with the following conversion:
    positionErr(arcsec) = 288/24 * velocity (deg/day); T3 values are the fractions of
    3-sigma outliers compared to a Gaussian distribution with the same median and sigma
    The listed values are expressed in miliarcsec.

    Astrometric Accuracy as a Function of Time

    Relative Astrometry by Field
    Quantity: maxoffRow medoffRow sigRow maxoffCol medoffCol sigCol
    col. 1 12.7 0.0 4.1 9.5 0.0 4.3
    col. 2 9.5 0.0 3.9 9.5 0.0 4.6
    col. 3 11.1 0.0 4.2 17.5 0.0 5.6
    col. 4 12.7 -3.2 4.0 11.1 0.0 4.9
    col. 5 12.7 -0.8 4.7 9.5 0.0 5.3
    col. 6 6.4 0.0 3.8 9.5 0.0 4.5
    mean abs(value) 10.850 0.667 4.117 11.100 0.000 4.867

    *Red entries are triggered by abs(entry) > 100 50 30 100 50 30
    Legend:
    The entries are listed in miliarcsec.
    Row: along the scan, Col: perpendicular to the scan.

    Flatfield Errors and Links to Data Files

    Flatfield analysis and links to data files are listed separately.

    Click here for the summary table.
    ® SDSS QA Dept.