Difference: StewartBoogertPhotometry20161202 (2 vs. 3)

Revision 302 Dec 2016 - AaronAndrews

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2016"
-- AaronAndrews - 01 Dec 2016
Line: 6 to 6
 
  • Observation 2: 20161125
  • Took multiple luminous, red, visual, and blue frames of Double Cluster and Dragonfly Cluster.
  • Used guide scope to control star tracking. Therefore, could stack frames.
Changed:
<
<
  • Example: Double cluster, blue, total exposure time (for 5 frames) 200s:
>
>
  • Example: Double cluster, blue, total exposure time (for 5 frames) 200s - more stars visible:
 
  • DoubleCluster_200s_blue_5stack.png
Changed:
<
<
  • Uplaoded all stacked frames to astrometry.net to fit (excluding blue for Dragonfly - guide system was not set up correctly when taking frames):
>
>
  • Uplaoded all stacked frames to astrometry.net to fit:
 
Added:
>
>
 
Changed:
<
<
  • Filter RA DEC
    Double Cluster blue
    visual 02h 22m 05.818s +57 11' 11.674"
    red
    Dragonfly Cluster visual
    red
>
>
  • Filter RA DEC
    Double Cluster blue 02h 22m 06.252s +57 11' 05.203"
    visual 02h 22m 05.818s +57 11' 11.674"
    red 02h 22m 05.973s +57 11' 10.444"
    Dragonfly Cluster blue 01h 19m 21.635s +58 21' 26.031"
    visual 01h 19m 29.901s +58 21' 01.003"
    red 01h 19m 26.550s +58 21' 11.465"
Simulation: Simulation_test11.py.txt

  • Can generate background mean (or standard deviation) using taylor series:
 \begin{equation} f\left ( x;a_{ij} \right ) = \sum_{i=0}^{N_{i}} \sum_{j=0}^{N_{j}} \frac{a_{ij}}{i!j!} \left ( x-x_{0} \right )^{i} \left ( y-y_{0} \right )^{j} \end{equation}
  • In order to get parameters, set up code to do a fit over an array of values using the expansion, up to a set number of terms.
  • First applied fit directly to image of M103 from observation 1, up to 25 terms:
  • LEFT: original image, M103. RIGHT: taylor series fit (25 terms)
  • M103_VIS_60S.pngM103_Simtest_BGmean_3.png
  • Then applied median analysis to frame first, then attempted fit (25 terms):
  • LEFT: Median filter for M103. RIGHT: taylor series fit (25 terms)
  • M103_Median_65box.pngM103_Simtest_BGmean_2.png
  • Attempted to fit up to 100 terms - failed.
 
META FILEATTACHMENT attachment="Obs2_images_stacked.zip" attr="" comment="Observation2 - stacked images" date="1480585482" name="Obs2_images_stacked.zip" path="Obs2_images_stacked.zip" size="20631280" user="zyva010" version="1"
META FILEATTACHMENT attachment="DoubleCluster_200s_blue_5stack.png" attr="" comment="Double Cluster (blue) stacked" date="1480585984" name="DoubleCluster_200s_blue_5stack.png" path="DoubleCluster_200s_blue_5stack.png" size="1100020" user="zyva010" version="1"
Added:
>
>
META FILEATTACHMENT attachment="Simulation_test11.py.txt" attr="" comment="Simulation code (11)" date="1480633547" name="Simulation_test11.py.txt" path="Simulation_test11.py" size="32740" user="zyva010" version="1"
META FILEATTACHMENT attachment="latexa0be1fc22480ab7e803cf0b055b2df78.png" attr="h" comment="" date="1480635429" name="latexa0be1fc22480ab7e803cf0b055b2df78.png" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Simtest_BGmean_2.png" attr="" comment="Background mean using median" date="1480636752" name="M103_Simtest_BGmean_2.png" path="M103_Simtest_BGmean_2.png" size="102996" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Simtest_BGmean_3.png" attr="" comment="Background mean using raw image" date="1480636773" name="M103_Simtest_BGmean_3.png" path="M103_Simtest_BGmean_3.png" size="135347" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Simtest_starsBG_3.fits" attr="" comment="M103 simulation plus background directly from real image" date="1480637014" name="M103_Simtest_starsBG_3.fits" path="M103_Simtest_stars+BG_3.fits" size="12487680" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Median_65box.png" attr="" comment="M103 median" date="1480637017" name="M103_Median_65box.png" path="M103_Median_65box.png" size="95116" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_VIS_60S.png" attr="" comment="M103 - real image" date="1480637219" name="M103_VIS_60S.png" path="M103_VIS_60S.png" size="1569987" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Simtest_BG_2.txt" attr="" comment="median background fit - parameters" date="1480637260" name="M103_Simtest_BG_2.txt" path="M103_Simtest_BG_2.txt" size="682" user="zyva010" version="1"
META FILEATTACHMENT attachment="M103_Simtest_BG_3.txt" attr="" comment="direct background fit - parameters" date="1480637279" name="M103_Simtest_BG_3.txt" path="M103_Simtest_BG_3.txt" size="681" user="zyva010" version="1"
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback