COMMISSION 27 OF THE I.A.U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 153

                                        Konkoly Observatory
                                        Budapest
					1 September 1966

	IMPROVED ELEMENTS FOR SEVEN RR LYRAE STARS

	The following elements were derived from Harvard patrol-
plate estimates. The plates generally spanned the interval 1890-1950,
while other observers' maxima often extended coverage into the 1960's.
                     _____
An approximate value (O-C) for the residual of a single normal maximum
is given, as well as the total interval covered by the observations.

			     YZ AQUARII
		Max JD_hel = 2435364.429 + 0.5519319d  E
		Interval: 2412971-38298
                ___
		O-C: +/-0.02d

			      AA AQUARII
		Max JD_hel = 2420748.585 + 0.6088901d  E
		Interval: 2413146-37545
                ___
		O-C: +/-0.02d

			      BN AQUARII
		Max JD_hel = 2429395.742 + 0.4696410d  E + (3.3dx10^-10) E^2
		Interval: 2413762-37872
                ___
		O-C: +/-0.01d

			      BO AQUARII
		Max JD_hel = 2426589.427 + 0.6940195d  E
		Interval: 2413408-37549
                ___
		O-C: +/-0.02d

			      RU CETI
		Max JD_hel = 2426964.003 + 0.58630000d  E - (1.20dx10^-9) E^2
		Interval: 2411392-38294
                ___
		O-C: +/-0.03d

			      RX CETI
		Max JD_hel = 2429961.094 + 0.5737055d  E
		Interval: 2411659-33572
                ___
		O-C: +/-0.015d

		Max JD_hel = 2427328.366 + 0.5737092d  E - (6.57dx10^-10) E^2
		Interval: 2427328-37913
                ___
		O-C: +/-0.015d

			    RW SCULPTORIS
		Max JD_hel = 2424731.886 + 0.45170768  E
		Interval: 2411254-34309
                ___
		O-C: +/-0.02d

	A discussion of RU Ceti, RX Ceti and RW Sculptoris has been
sent to Variable Stars; it is planned to submit a paper on the other stars
to the same journal in the near future.


						L. J. ROBINSON
					     "Sky and Telescope"
					      Cambridge, Mass.
						     USA