Difference: StewartBoogertPhotometry20170201 (1 vs. 8)

Revision 801 Feb 2017 - LauraBevilacqua

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
  • Set star-finding threshold to 1*Sigma to include as many stars as possible
Changed:
<
<
  • Hist_dij_InputOutput_2000.png
>
>
  • Distances between true (i) and candidate stars (j):
    DistancesBetweenStars.png
  • Hist_dij_InputOutput_2000.png
 
  • Hist_dij_InputOutput_1Sigma_20.png

  • Chose a 3 pixel separation as the limit for matching stars between the input simulated data and candidate data
Line: 67 to 68
  -- AaronAndrews - 30 Jan 2017
Deleted:
<
<
  • Distances between true (i) and candidate stars (j):
    DistancesBetweenStars.png
 
META FILEATTACHMENT attachment="HR_Errors1.png" attr="" comment="HR with errors, simulated double cluster" date="1485788044" name="HR_Errors1.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors1.png" size="29535" user="zyva010" version="1"
META FILEATTACHMENT attachment="HR_Errors2.png" attr="" comment="HR with errors, simulated double cluster (zoomed)" date="1485788072" name="HR_Errors2.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors2.png" size="31797" user="zyva010" version="1"
META FILEATTACHMENT attachment="latex66f934bc71097fd1f3cb489afd441118.png" attr="h" comment="" date="1485788767" name="latex66f934bc71097fd1f3cb489afd441118.png" user="zyva010" version="1"

Revision 701 Feb 2017 - AnishaVadher

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
Line: 23 to 23
 
  • Transformation Equation:
  • CodeCogsEqn_1.png
  • Where (x,y) is the transformed coordinate, m is the transformation matrix, (x,y) is the reference pixel obtained from the header of the new fits file from Astrometry.net, and (delta_x,delta_y) is the reference pixel converted from RA/DEC.
Changed:
<
<
  • Visual Blue
    Cental Coord RA: 02h 22m 05.712s
    Dec: +57° 11' 09.516"
    Degrees (35.524, 57.186)    		 RA: 02h 22m 06.101s
    Dec: +57° 11' 07.288"
    Degrees (35.525, 57.185)
    Reference Coord
    (deg)    		 (35.5401978009, 57.173493981) (35.5475695422, 57.1718325267)
    Reference Pixel (710.564499521, 582.921770788) (691.959394509, 588.543775601)
    Transformation
    Matrix    		 [[-0.000168531158698, -5.13170131402E-06]
    [4.85829972477E-06, -0.000168690594262]]    		 [[-0.000168632203737, -5.10181679782E-06]
    [4.90637384969E-06, -0.000168703688821]]
    Inverted Matrix [[-5938.8289203, -180.66387345]
    [171.03864644, 5933.21591892]]    		 [[-5924.85229703, 179.17516318]
    [-172.31123147, -5922.34174989]]
>
>
  • Visual Blue
    Cental Coord RA: 02h 22m 05.712s
    Dec: +57° 11' 09.516"
    Degrees (35.524, 57.186)    		 RA: 02h 22m 06.101s
    Dec: +57° 11' 07.288"
    Degrees (35.525, 57.185)
    Reference Coord
    (deg) (delta)    		 (35.5401978009, 57.173493981) (35.5475695422, 57.1718325267)
    Reference Pixel (v) (710.564499521, 582.921770788) (691.959394509, 588.543775601)
    Transformation
    Matrix    		 [[-0.000168531158698, -5.13170131402E-06]
    [4.85829972477E-06, -0.000168690594262]]    		 [[-0.000168632203737, -5.10181679782E-06]
    [4.90637384969E-06, -0.000168703688821]]
    Inverted Matrix [[-5938.8289203, -180.66387345]
    [171.03864644, 5933.21591892]]    		 [[-5924.85229703, 179.17516318]
    [-172.31123147, -5922.34174989]
 
Changed:
<
<
  • Compare with coordinates from star finder
  • Work out difference between coordinates
>
>
  • Converted Reference coordinate into pixel coordinates the same way Aaron did for simulation
  • Reference Coord into Pixel coordinates (delta) = (818.31717994, 435.103886)
  • (v)' = (710.42435476, 582.99914435)
  • vstar1: [[ 171.87468786][ 80.055386 ]]
    vstar1_prime: [[ 171.73454309][ 80.13275956]]
    vstar2: [[ 957.24304638][ 93.475386 ]]
    vstar2_prime: [[ 957.10290161][ 93.55275956]]
 Error Propagation
  • Calculated flux as sum over pixels, subtracting background:
%BEGINLATEX% \begin{equation}
Line: 65 to 67
  -- AaronAndrews - 30 Jan 2017
Added:
>
>
  • Distances between true (i) and candidate stars (j):
    DistancesBetweenStars.png
 
META FILEATTACHMENT attachment="HR_Errors1.png" attr="" comment="HR with errors, simulated double cluster" date="1485788044" name="HR_Errors1.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors1.png" size="29535" user="zyva010" version="1"
META FILEATTACHMENT attachment="HR_Errors2.png" attr="" comment="HR with errors, simulated double cluster (zoomed)" date="1485788072" name="HR_Errors2.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors2.png" size="31797" user="zyva010" version="1"
META FILEATTACHMENT attachment="latex66f934bc71097fd1f3cb489afd441118.png" attr="h" comment="" date="1485788767" name="latex66f934bc71097fd1f3cb489afd441118.png" user="zyva010" version="1"
Line: 80 to 85
 
META FILEATTACHMENT attachment="Hist_dij_InputOutput_2000.png" attr="" comment="distances between all input and output stars" date="1485876120" name="Hist_dij_InputOutput_2000.png" path="Hist_dij_InputOutput_2000.png" size="38954" user="zyvb786" version="1"
META FILEATTACHMENT attachment="Transform.png" attr="" comment="Converting RA/DEC to pixel coordinates" date="1485898382" name="Transform.png" path="Transform.png" size="52475" user="zyva858" version="1"
META FILEATTACHMENT attachment="CodeCogsEqn_1.png" attr="" comment="Transformation Equation" date="1485899269" name="CodeCogsEqn_1.png" path="CodeCogsEqn_1.png" size="1845" user="zyva858" version="1"
Added:
>
>
META FILEATTACHMENT attachment="DistancesBetweenStars.png" attr="" comment="Distances between true (i) and candidate stars (j)" date="1485946346" name="DistancesBetweenStars.png" path="DistancesBetweenStars.png" size="29423" user="zyva858" version="1"

Revision 601 Feb 2017 - LauraBevilacqua

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
Added:
>
>
  • Set star-finding threshold to 1*Sigma to include as many stars as possible
 
  • Hist_dij_InputOutput_2000.png
  • Hist_dij_InputOutput_1Sigma_20.png

Revision 531 Jan 2017 - AnishaVadher

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
Line: 18 to 18
 
  • Get Aladin coordinates of 2 bright stars for the Visual and Blue images used to make HR
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png
Changed:
<
<
  • Convert coordinates to pixel coordinates
>
>
  • Converting RA/DEC to pixel coordinates:
    Transform.png
  • Transformation Equation:
  • CodeCogsEqn_1.png
  • Where (x,y) is the transformed coordinate, m is the transformation matrix, (x,y) is the reference pixel obtained from the header of the new fits file from Astrometry.net, and (delta_x,delta_y) is the reference pixel converted from RA/DEC.
  • Visual Blue
    Cental Coord RA: 02h 22m 05.712s
    Dec: +57° 11' 09.516"
    Degrees (35.524, 57.186)    		 RA: 02h 22m 06.101s
    Dec: +57° 11' 07.288"
    Degrees (35.525, 57.185)
    Reference Coord
    (deg)    		 (35.5401978009, 57.173493981) (35.5475695422, 57.1718325267)
    Reference Pixel (710.564499521, 582.921770788) (691.959394509, 588.543775601)
    Transformation
    Matrix    		 [[-0.000168531158698, -5.13170131402E-06]
    [4.85829972477E-06, -0.000168690594262]]    		 [[-0.000168632203737, -5.10181679782E-06]
    [4.90637384969E-06, -0.000168703688821]]
    Inverted Matrix [[-5938.8289203, -180.66387345]
    [171.03864644, 5933.21591892]]    		 [[-5924.85229703, 179.17516318]
    [-172.31123147, -5922.34174989]]
 
  • Compare with coordinates from star finder
  • Work out difference between coordinates
Deleted:
<
<
  • Visual Blue
    Central Coord RA: 02h 22m 05.712s
    Dec: +57° 11' 09.516"
    Degrees (35.524, 57.186)    		 RA: 02h 22m 06.101s
    Dec: +57° 11' 07.288"
    Degrees (35.525, 57.185)
    Reference Pixel (710.564499521, 582.921770788) (691.959394509, 588.543775601)
    Transformation
    Matrix    		 [[-0.000168531158698, -5.13170131402E-06]
    [4.85829972477E-06, -0.000168690594262]]    		 [[-0.000168632203737, -5.10181679782E-06]
    [4.90637384969E-06, -0.000168703688821]]
    Inverted Matrix [[-5938.8289203, -180.66387345]
    [171.03864644, 5933.21591892]]    		 [[-5924.85229703, 179.17516318]
    [-172.31123147, -5922.34174989]]
 Error Propagation
  • Calculated flux as sum over pixels, subtracting background:
%BEGINLATEX% \begin{equation}
Line: 52 to 56
 
  • Errors shown on zoomed section of simulated candidate HR diagram:
HR_Errors2.png
Added:
>
>		Astrometry files

* http://nova.astrometry.net/user_images/1467041#annotated

* http://nova.astrometry.net/user_images/1467040#annotated

 -- AaronAndrews - 30 Jan 2017

META FILEATTACHMENT attachment="HR_Errors1.png" attr="" comment="HR with errors, simulated double cluster" date="1485788044" name="HR_Errors1.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors1.png" size="29535" user="zyva010" version="1"
Line: 67 to 77
 
META FILEATTACHMENT attachment="fractionStarsMatched.png" attr="" comment="fraction of stars matched as a function of threshold" date="1485875913" name="fractionStarsMatched.png" path="fractionStarsMatched.png" size="33675" user="zyvb786" version="1"
META FILEATTACHMENT attachment="Hist_dij_InputOutput_1Sigma_20.png" attr="" comment="distances between all input and output stars" date="1485876086" name="Hist_dij_InputOutput_1Sigma_20.png" path="Hist_dij_InputOutput_1Sigma_20.png" size="32654" user="zyvb786" version="1"
META FILEATTACHMENT attachment="Hist_dij_InputOutput_2000.png" attr="" comment="distances between all input and output stars" date="1485876120" name="Hist_dij_InputOutput_2000.png" path="Hist_dij_InputOutput_2000.png" size="38954" user="zyvb786" version="1"
Added:
>
>
META FILEATTACHMENT attachment="Transform.png" attr="" comment="Converting RA/DEC to pixel coordinates" date="1485898382" name="Transform.png" path="Transform.png" size="52475" user="zyva858" version="1"
META FILEATTACHMENT attachment="CodeCogsEqn_1.png" attr="" comment="Transformation Equation" date="1485899269" name="CodeCogsEqn_1.png" path="CodeCogsEqn_1.png" size="1845" user="zyva858" version="1"

Revision 431 Jan 2017 - AnishaVadher

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
Line: 16 to 16
 Scaling Correction
  • Goal: correct the scaling error for the real HR diagram (from 20170119 meeting)
  • Get Aladin coordinates of 2 bright stars for the Visual and Blue images used to make HR
Changed:
<
<
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png
>
>
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png
 
  • Convert coordinates to pixel coordinates
  • Compare with coordinates from star finder
  • Work out difference between coordinates
Added:
>
>
  • Visual Blue
    Central Coord RA: 02h 22m 05.712s
    Dec: +57° 11' 09.516"
    Degrees (35.524, 57.186)    		 RA: 02h 22m 06.101s
    Dec: +57° 11' 07.288"
    Degrees (35.525, 57.185)
    Reference Pixel (710.564499521, 582.921770788) (691.959394509, 588.543775601)
    Transformation
    Matrix    		 [[-0.000168531158698, -5.13170131402E-06]
    [4.85829972477E-06, -0.000168690594262]]    		 [[-0.000168632203737, -5.10181679782E-06]
    [4.90637384969E-06, -0.000168703688821]]
    Inverted Matrix [[-5938.8289203, -180.66387345]
    [171.03864644, 5933.21591892]]    		 [[-5924.85229703, 179.17516318]
    [-172.31123147, -5922.34174989]]
 Error Propagation
  • Calculated flux as sum over pixels, subtracting background:
%BEGINLATEX% \begin{equation}

Revision 331 Jan 2017 - LauraBevilacqua

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Added:
>
>		Matching Stars
  • Have to find the minimum distance between all stars that are input and the candidate stars
  • Hist_dij_InputOutput_2000.png
  • Hist_dij_InputOutput_1Sigma_20.png

  • Chose a 3 pixel separation as the limit for matching stars between the input simulated data and candidate data
Star Finding Threhold


  • Plotted fraction of stars matched in the simulated Double Cluster with varying threshold values
  • Appears 5*Sigma is an appropriate choice
fractionStarsMatched.png
 Scaling Correction
  • Goal: correct the scaling error for the real HR diagram (from 20170119 meeting)
  • Get Aladin coordinates of 2 bright stars for the Visual and Blue images used to make HR
Changed:
<
<
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png
>
>
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png
 
  • Convert coordinates to pixel coordinates
  • Compare with coordinates from star finder
Line: 50 to 64
 
META FILEATTACHMENT attachment="latexa81cccba835343cf893db80578c9ad08.png" attr="h" comment="" date="1485789048" name="latexa81cccba835343cf893db80578c9ad08.png" user="zyva010" version="1"
META FILEATTACHMENT attachment="latexf3c2caf71e7731bbc1d1742509e3c85b.png" attr="h" comment="" date="1485789107" name="latexf3c2caf71e7731bbc1d1742509e3c85b.png" user="zyva010" version="1"
META FILEATTACHMENT attachment="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" attr="" comment="Double Cluster blue frame in Aladin indicating 2 coordinates" date="1485873864" name="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" path="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" size="2042433" user="zyva858" version="1"
Added:
>
>
META FILEATTACHMENT attachment="fractionStarsMatched.png" attr="" comment="fraction of stars matched as a function of threshold" date="1485875913" name="fractionStarsMatched.png" path="fractionStarsMatched.png" size="33675" user="zyvb786" version="1"
META FILEATTACHMENT attachment="Hist_dij_InputOutput_1Sigma_20.png" attr="" comment="distances between all input and output stars" date="1485876086" name="Hist_dij_InputOutput_1Sigma_20.png" path="Hist_dij_InputOutput_1Sigma_20.png" size="32654" user="zyvb786" version="1"
META FILEATTACHMENT attachment="Hist_dij_InputOutput_2000.png" attr="" comment="distances between all input and output stars" date="1485876120" name="Hist_dij_InputOutput_2000.png" path="Hist_dij_InputOutput_2000.png" size="38954" user="zyvb786" version="1"

Revision 231 Jan 2017 - AnishaVadher

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
Added:
>
>		Scaling Correction
  • Goal: correct the scaling error for the real HR diagram (from 20170119 meeting)
  • Get Aladin coordinates of 2 bright stars for the Visual and Blue images used to make HR
  • Double Cluster blue frame in Aladin indicating 2 coordinates:
    DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png

  • Convert coordinates to pixel coordinates
  • Compare with coordinates from star finder
  • Work out difference between coordinates
 Error Propagation
  • Calculated flux as sum over pixels, subtracting background:
%BEGINLATEX% \begin{equation}
Line: 41 to 49
 
META FILEATTACHMENT attachment="latexfd96f71a14e140178fed0676462f2333.png" attr="h" comment="" date="1485789047" name="latexfd96f71a14e140178fed0676462f2333.png" user="zyva010" version="1"
META FILEATTACHMENT attachment="latexa81cccba835343cf893db80578c9ad08.png" attr="h" comment="" date="1485789048" name="latexa81cccba835343cf893db80578c9ad08.png" user="zyva010" version="1"
META FILEATTACHMENT attachment="latexf3c2caf71e7731bbc1d1742509e3c85b.png" attr="h" comment="" date="1485789107" name="latexf3c2caf71e7731bbc1d1742509e3c85b.png" user="zyva010" version="1"
Added:
>
>
META FILEATTACHMENT attachment="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" attr="" comment="Double Cluster blue frame in Aladin indicating 2 coordinates" date="1485873864" name="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" path="DoubleCluster_40s_blue_5_ASTRO_Aladin_Annotated.png" size="2042433" user="zyva858" version="1"

Revision 130 Jan 2017 - AaronAndrews

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="StewartBoogertPhotometry2016"
Error Propagation
  • Calculated flux as sum over pixels, subtracting background:
\begin{equation} F = \sum_{i,j}^{ } \left ( n_{i,j} - b_{i,j} \right ) \end{equation}
  • $ n_{i,j} $ : pixel ADU. Assume Poisson distributed, hence $ V \left [ n_{i,j} \right ] = n_{i,j} $
  • $ b_{i,j} $ : background value. Determined, along with error, via filter method.
  • Therefore variance of flux given by:
\begin{equation} V \left [ F \right ] = \sum_{i,j}^{ } \left ( n_{i,j} + V \left [ b_{i,j} \right ] \right ) \end{equation}
  • Magnitude calculated using equation:
\begin{equation} m = -2.5 \log_{10} \left ( F \right ) +c \end{equation}
  • Therefore magnitude variance given by:
\begin{equation} V \left [ m \right ] = \left ( \frac{2.5}{ \ln 10} \right )^{2} \frac{V \left [ F \right ] }{F^{2}} \end{equation}
  • Errors shown on zoomed section of simulated candidate HR diagram:
HR_Errors2.png

-- AaronAndrews - 30 Jan 2017

META FILEATTACHMENT attachment="HR_Errors1.png" attr="" comment="HR with errors, simulated double cluster" date="1485788044" name="HR_Errors1.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors1.png" size="29535" user="zyva010" version="1"
META FILEATTACHMENT attachment="HR_Errors2.png" attr="" comment="HR with errors, simulated double cluster (zoomed)" date="1485788072" name="HR_Errors2.png" path="Y:\PH4100\Analysis\DoubleClusterSim\HR_Errors2.png" size="31797" user="zyva010" version="1"
META FILEATTACHMENT attachment="latex66f934bc71097fd1f3cb489afd441118.png" attr="h" comment="" date="1485788767" name="latex66f934bc71097fd1f3cb489afd441118.png" user="zyva010" version="1"
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