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Results of an international campaign to photometrically monitor the uniquepre-main sequence eclipsing object KH 15D are reported. An updated ephemerisfor the eclipse is derived that incorporates a slightly revised period of 48.36d. There is some evidence that the orbital period is actually twice that value,with two eclipses occurring per cycle. The extraordinary depth (~3.5 mag) andduration (~18 days) of the eclipse indicate that it is caused by circumstellarmatter, presumably the inner portion of a disk. The eclipse has continued tolengthen with time and the central brightness reversals are not as extreme asthey once were. V-R and V-I colors indicate that the system is slightly bluernear minimum light. Ingress and egress are remarkably well modeled by thepassage of a knife-edge across a limb-darkened star. Possible models for thesystem are briefly discussed.Comment: 19 pages, 5 figure

Fine Structure in the Circumstellar Environment of a Young, Solar‐like Star: The Unique Eclipses of KH 15D