SIMBAD references

The last observed superoutburst of VY Aqr occurred in April 1993 (see AAVSO Alert Notice 171), when it reached visual magnitude 10.0 and was brighter than 13.0 for 15 days. The last regular outburst to be observed occurred in April 1994, when VY Aqr reached visual magnitude 11.3 and was brighter than 13.0 for 3 days. The true nature of VY Aqr is not known, as its superhump behavior during the 1993 superoutburst did not fit the classical pattern for WZ Sge-type stars (see Patterson et al. 1993, PASP 105, 69). There is a very interesting pattern to the outbursts of VY Aqr: For four of the five superoutbursts recorded in the AAVSO International Database, there is a "regular" outburst approximately 1 year later. For the fifth superoutburst, there there are three 5- or 6-day gaps during the time when this "follow-up" regular outburst might have been expected.