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We have observed the fast nova V5583 Sagittarii with five B, V, y, R_C, andI_C bands, and found that these multi-band light curves are almost identicalwith those of V382 Vel 1999 until at least 100 days after outburst. A supersoftX-ray phase of V382 Vel was detected with BeppoSAX about six months afteroutburst. V5583 Sgr outbursted a few days ago the discovery on 2009 August 6.5UT near its optical peak. From a complete resemblance between these two novalight curves, we expect a supersoft X-ray phase of V5583 Sgr six months afteroutburst. Detection of supersoft X-ray turn-on/turnoff dates strongly constrainthe evolution of a nova and, as a result, mass range of the WD. For a timelyobservation of a supersoft X-ray phase of V5583 Sgr, we have calculated novaoutburst evolution based on the optically thick wind theory, which predicts thesupersoft X-ray phase: it will most probably start between days 100 and 140 andcontinue until days 200-240 after outburst. We strongly recommend multipleobservations during 2009 December, and 2010 January, February, and March todetect the turn-on and turnoff times of the supersoft X-ray phase of V5583 Sgr.

A Prediction of Supersoft X-Ray Phase of Classical Nova V5583 Sagittarii