by Anthony Ayiomamitis
The large-amplitude short-period pulsating star CY Aqr is one of the fastest variables known with a period of 87.9 minutes and which involves a delta mag ranging from 0.74 (V) to 0.88 (B) magnitudes during this very brief time interval. Further details from the General Variable Star Search Gateway are available here whereas an AAVSO finder chart is available here.