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The eclipsing binary system ASAS J174600-2321.3, which has shown aconspicuous brightening of ~4 magnitudes (V) in the past, was recentlyidentified as a symbiotic nova candidate. A long-term photometric monitoringprogram was initiated in July 2014. In its present active stage, the systemshows deep eclipses with an amplitude of ~3.5 magnitudes (V) that occur aboutevery 33 months. In order to monitor the eclipse of 2015, AAVSO Alert Notice510 was issued. During the ensuing campaign, AAVSO observers obtained 338measurements in Johnson B, 393 measurements in Johnson V, and 369 measurementsin Cousins I, as well as 27 visual observations. The present paper presents andanalyzes these data from the AAVSO International Database, along withobservations from the aforementioned photometric monitoring program. From thesedata, we were able to refine the orbital period to Porb = 1012.4 days.Furthermore, the data are suggestive of a slight decrease in mean brightness,which -if proven real- might indicate a decline of the outburst.

New Photometric Observations and the 2015 Eclipse of the Symbiotic Nova Candidate ASAS J174600-2321.3