
META TOPICPARENT 
name="StewartBoogertPhotometry2016" 
 LauraBevilacqua  18 Oct 2016 

Anisha: 

< < 
 Corrected histrogram of number of photoelectrons for a 0.1s exposure in the dark frame with 500 bins  logarithmicly normalized:

> > 
 Corrected histrogram of number of photoelectrons for a 0.1s exposure in the dark frame with 500 bins  logarithmicly normalized:

 

< < 
 The median intensity as a function of exposure time.:

> > 
 The median intensity as a function of exposure time.:


 Line of best fit: y = 917.43 + 0.08x


< < 
 Error as a function of exposure time:

> > 
 Error as a function of exposure time:


 Line of best fit: y = 15.76 + 0.73x
%BEGINLATEX% Mean number of effective photoelectrons : \begin{equation} \nu = \nu_0 + \mu t. \end{equation} Actual number of photoelectrons: \begin{equation} n = n_0 + m, \end{equation} where $n_0$ follows a Gaussian distribution and may come from electronic noise and $m$ follows a Poisson distribution as a function of $\mu t$. Error in $m \sigma_m$ come from $\sqrt{\mu t}$. 

 Images scanned for stars and correct star count is returned
 Edge detection helps identify star position


< < 
 The maximum pixel value was found to be 65195 from the fits file below, as opposed to Aaron's given value of 65535
 Threshold of 100 set so if pixels are above this value they are set as white background, if below they are coloured black (remember reverse grayscale):
 Edge detection:

> > 
 The maximum pixel value was found to be 65195 from the fits file below, as opposed to Aaron's given value of 65535
 Threshold of 100 set so if pixels are above this value they are set as white background, if below they are coloured black (remember reverse grayscale):
 Edge detection:

 

< < 
 Maximum pixel value found to be 62673, compared to Aaron's 60000:
 Threshold set as 20 so that stars don't touch, achieves accurate count of 8:

> > 
 Maximum pixel value found to be 62673, compared to Aaron's 60000:
 Threshold set as 20 so that stars don't touch, achieves accurate count of 8:


META FILEATTACHMENT 
attachment="SkewTest2.png" attr="" comment="Testing x and y correlation (P) for P=0, P=0.5, P=0.999" date="1476827216" name="SkewTest2.png" path="SkewTest2.png" size="19013" user="zyva010" version="1" 
META FILEATTACHMENT 
attachment="Histogram_of_number_of_pixel_values_for_0.1s_exposure_500_bins.png" attr="" comment="Corrected histrogram of number of photoelectrons for a 0.1s exposure in the dark frame with 500 bins  logarithmicly normalized" date="1476982418" name="Histogram_of_number_of_pixel_values_for_0.1s_exposure_500_bins.png" path="Histogram_of_number_of_pixel_values_for_0.1s_exposure_500_bins.png" size="18847" user="zyva858" version="1" 
