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Astronomy Science Data
Kepler data, sensor pos 41


GIF movie variables, Kepler data pos 41

Kepler movie 2009 to 2013
Coordinates/Direction : RA: 290.427033o, DEC: +43.624771o. Angle calculator
Object size : sensor about 1 x 1 degrees
Object magnitude : -
Object : Area of Cygnus, Lyra and Draco
Date : 2009-08-19 to 2013-04-08
Lens/telescope : Kepler Space observatory
Film/CCD : Sensor position 41 (from sensor 41, 42, 43, 44), Kepler data, credits: STScI
Filter/Wavelength : 420 to 900 nm
Exp. time : 27 minutes x 44 frames
Image process tool : Fits viewer NASA, AstroImageJ, Fitswork, Irfanview
Processing : Flat calibrated, GIF movie
Site : Space
Comment : This is my first attempt to examine variables, each frame from one month and there are 44 of them ranging over almost four year. You will clearly see one variable. Later I can tell you which it is. Hans Bengtsson at Astronet forum was faster then me to identify the star, it's a Mira, V1503 Cyg of spectral type M8.

The horizontal and vertical lines change directions when satellite rotates 90 degree every three months. It must do that to have the solar panels directed towards the Sun.
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/Kepler (spacecraft)
https://en.wikipedia.org/ wiki/ Variable star
V1503 Cyg:
http://simbad.u-strasbg.fr

Differential Photometry of variable star V1503 Cyg

Kepler data: Variable star V1503 Cyg
Image process tool : AstroImageJ, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : In this image you can se how I have chosen the star T1 to analyze and that is the above variable star V1503 Cyg. By comparing it's light variation over the months relative stable stars, here labeled C2, C3 and C4 I can do differential photometry.
More to know : Photometry (astronomy):
https://en.wikipedia.org/ wiki/ Photometry (astronomy)
Hans Bengtsson, discovery information:
http://www.konkoly.hu/ cgi-bin/ IBVSpdf?1999 (PDF)

Light curve of variable star V1503 Cyg

Image process tool : AstroImageJ, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : Here is the light curve from above plotted, it had been better if I had a data point every week, not month. But I can't ask NASA to reprogram the Kepler space craft for me.

The Y-axis is normalized and just relative, the original data are number of detected electrons. It can easily be recalculated to magnitudes if I have the magnitude of the reference stars.
The X-axis is in Modified Julian Date time. One month for every dot.
More to know : Modified Julian Date:
http://tycho.usno.navy.mil/ mjd.html
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