After a long period of working in the field of astrometry, and once I´m able to use a real CCD camera (QHY9), I´m devoted again to Variable Stars detection. To warm up, I decided starting with a catalogued easy star, YZ Bootes. It´s a little less than a three hours period, and I had two good forecast nights ahead.
A very suitable 10 magnitude for my small humble 80mm refractor telescope, gave birth this beautiful graphic sinusoid.
This star is a Delta Scuti type placed in the Bootes constellation and currently it´s high in the northeast at 23.00h (Local time).
The first night was a very good one in terms of steadiness. A very accurated self-guiding, lead a very good tracking of the mount all night long. The second night brought us some tiny high clouds that made the self-guiding difficult, having to stop and restarting it twice or more.
Finally, after 70 exposures of 120 seconds the first night and 90 exposures of 120 seconds the second one, I got the period graphic of 0.104 days or what is the sane, a little more of two hours and a half.
I have to say that I was forced to put the image out of focus due to the brightness of this star, but at the same time I got the right configuration for the photometric label of FOTODIF, so these are the results.
NGC6888 Crescent Nebula
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