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We present new KPNO 0.9-m optical and VLA HI spectral line observations ofthe Orion dwarf galaxy. This nearby (D ~ 5.4 Mpc), intermediate-mass (M_dyn =1.1x10^10 Solar masses) dwarf displays a wealth of structure in its neutralISM, including three prominent "hole/depression" features in the inner HI disk.We explore the rich gas kinematics, where solid-body rotation dominates and therotation curve is flat out to the observed edge of the HI disk (~6.8 kpc). TheOrion dwarf contains a substantial fraction of dark matter throughout its disk:comparing the 4.7x10^8 Solar masses of detected neutral gas with estimates ofthe stellar mass from optical and near-infrared imaging (3.7x10^8 Solar masses)implies a mass-to-light ratio of ~13. New H alpha observations show onlymodest-strength current star formation (~0.04 Solar masses per year); this starformation rate is consistent with our 1.4 GHz radio continuum non-detection.

The Stellar and Gaseous Contents of the Orion Dwarf Galaxy