(r4) StewartBoogertPhotometry20161202 < Public < RHUL Physics Department TWiki

-- AaronAndrews - 01 Dec 2016

Observation on 25/11/2016:

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.
Example: Double cluster, blue, total exposure time (for 5 frames) 200s - more stars visible:
Uplaoded all stacked frames to astrometry.net to fit:
- Double cluster blue: http://nova.astrometry.net/user_images/1396168#annotated
- Double cluster visual: http://nova.astrometry.net/user_images/1396165#annotated
- Double cluster red: http://nova.astrometry.net/user_images/1396166#annotated
- Dragonfly cluster blue: http://nova.astrometry.net/user_images/1396774#annotated
- Dragonfly cluster visual: http://nova.astrometry.net/user_images/1396169#annotated
- Dragonfly cluster red: http://nova.astrometry.net/user_images/1396167#annotated
Coordinates at image centers:

	Filter	RA	DEC
Double Cluster	blue	02^h 22^m 06.252^s	+57° 11' 05.203"
	visual	02^h 22^m 05.818^s	+57° 11' 11.674"
	red	02^h 22^m 05.973^s	+57° 11' 10.444"
Dragonfly Cluster	blue	01^h 19^m 21.635^s	+58° 21' 26.031"
	visual	01^h 19^m 29.901^s	+58° 21' 01.003"
	red	01^h 19^m 26.550^s	+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, origin=(0,0))
Then applied median analysis to frame first, then attempted fit (25 terms):
LEFT: Median filter for M103. RIGHT: taylor series fit (25 terms, origin=(0,0))
Attempted to fit up to 100 terms - failed.

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
png	DoubleCluster_200s_blue_5stack.png	r1	manage	1074.2 K	01 Dec 2016 - 09:53	AaronAndrews	Double Cluster (blue) stacked
png	M103_Median_65box.png	r1	manage	92.9 K	02 Dec 2016 - 00:03	AaronAndrews	M103 median
txt	M103_Simtest_BG_2.txt	r1	manage	0.7 K	02 Dec 2016 - 00:07	AaronAndrews	median background fit - parameters
txt	M103_Simtest_BG_3.txt	r1	manage	0.7 K	02 Dec 2016 - 00:07	AaronAndrews	direct background fit - parameters
png	M103_Simtest_BGmean_2.png	r1	manage	100.6 K	01 Dec 2016 - 23:59	AaronAndrews	Background mean using median
png	M103_Simtest_BGmean_3.png	r1	manage	132.2 K	01 Dec 2016 - 23:59	AaronAndrews	Background mean using raw image
fits	M103_Simtest_starsBG_3.fits	r1	manage	12195.0 K	02 Dec 2016 - 00:03	AaronAndrews	M103 simulation plus background directly from real image
png	M103_VIS_60S.png	r1	manage	1533.2 K	02 Dec 2016 - 00:06	AaronAndrews	M103 - real image
zip	Obs2_images_stacked.zip	r1	manage	20147.7 K	01 Dec 2016 - 09:44	AaronAndrews	Observation2 - stacked images
txt	Simulation_test11.py.txt	r1	manage	32.0 K	01 Dec 2016 - 23:05	AaronAndrews	Simulation code (11)

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Topic revision: r4 - 02 Dec 2016 - AaronAndrews

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