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V651 Mon is the binary central star of the bipolar planetary nebula NGC 2346.The star showed the second-ever deep fading in 1996-1997, which was presumablycaused by obscuration by a dust cloud in the planetary nebula, as was proposedto explain the 1981-1985 event. The entire duration of the 1996-1997 event was\~400 d, remarkably shorter than the 1981-1985 event, suggesting that theobscuring body was smaller or had a larger tangential velocity. The mostremarkable feature in this event was the presence of a sharply definedtransient clearing (brightening). From the time-scale of the variation, wepropose an upper limit of the projected scale of several times ~10^11 cm of thestructure responsible for the brightening. This observation provides the firstevidence for a sharply defined, small lucent structure within the obscuringbody around the central star of NGC 2346Comment: 4 pages, 3 figures (using a non-standard style file

The 1996–1997 Fading of V651 Monocerotis, the Binary Central Star of the Planetary Nebula NGC 2346