  We present the first high-resolution near-infrared images of the edge-on
silhouette circumstellar disk, Orion 114-426, made using NICMOS on the Hubble
Space Telescope. Images taken against the bright nebular background of the
ionized hydrogen Pa$\alpha$ line at 1.87 micron show the major axis of the disk
to be approximately 20% smaller than at 0.6 micron, from which we deduce the
structure of the edge of the disk. Continuum images of diffuse polar lobes
above and below the plane of the disk show a morphology and evolution with
wavelength consistent with predictions for reflection nebulae in a diffuse
envelope with large polar cavities, surrounding a thin, massless, Keplerian
disk, centered on an otherwise hidden central star. We make use of our
observations and reasonable assumptions about the underlying disk structure to
show that the disk mass is at least 10 earth masses and plausibly $\geq 5\times
10^{-4}$ solar masses.
