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ASASSN-14dx showed an extraordinary outburst whose features are the smalloutburst amplitude (~ 2.3 mag) and long duration (> 4 years). Because we founda long observational gap of 123 d before the outburst detection, we proposethat the main outburst plateau was missed and that this outburst is just a"fading tail" often seen after the WZ Sge-type superoutbursts. In order todistinguish between WZ Sge and SU UMa-type dwarf novae (DNe), we investigatedGaia DR2 statistically. We applied a logistic regression model and succeeded inclassifying by using absolute Gaia magnitudes $M_{G}$ and Gaia colors $G_{\rmBP}-G_{\rm RP}$. Our new classifier also suggests that ASASSN-14dx is the bestcandidate of a WZ Sge-type DN. We estimated distances from the earth of knownWZ Sge stars by using Gaia DR2 parallaxes. The result indicates thatASASSN-14dx is the third nearest WZ Sge star (next to WZ Sge and V455 And), andhence the object can show the third brightest WZ Sge-type superoutburst whosemaximum is $V$ = 8-9 mag.

Third Nearest WZ Sge-Type Dwarf Nova candidate ASASSN-14dx Classified on the Basis of Gaia Data Release 2