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Z And is the prototype ZAND Symbiotic Star.  The star is bright enough to be observed with small telescopes or
binoculars, especially when in outburst!

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Analysis of 1373 observations from 1993-2020 shown in the light curve above reveal a period of 643.71d +/- 9d, which is in close agreement with that shown in the GCVS.  I could find no evidence of the 758d period given in modern publications.