I observed YY Cet.

The element of GCVS is  min = 2427333.500 + 1.117455 x Cycle.

The following light curves.



I think that I differ the period.

Strohmeier et. al. found YY Cet in 1966. ( IBVS 140 )
The name is BV795.

YY Cet was registered in GCVS by the 57th name list in 1970.
The name was changed. ( BV795 ---> YY Cet )

The element of GCVS is  min = 2427333.500 + 1.117455 x Cycle.

I read the paper of this star.

Contact and near-contact binary systems - III.The semi-detached system YY Cet
T.M.McFarlane, D.J.King & R.W.Hilditch
Mon.Not.R.astr.Soc.(1986)218,159-169 ( 1986MNRAS.218..159M )

The element of this paper is  min = 2445259.0560 + 0.7904596 x Cycle.

I rewrote the light curve.



The light curve fitted.

I received the observation data of YY Cet from Mr. Anton Paschke (e-mail Anton_Paschke@swissre.com).

He is observing YY Cet on 30/August/1998, 15/December/1998 and 21/January/1999.

The ccd camera is used without a filter and average 5 images.

He calculated by the graph's below using min=2427333.500+1.117455xCycle.



He calculated by the graph's below using min=2445259.056+0.7904596xCycle.






		

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