The disk of the galaxy is inclined with respect to the observer, with the inclination angle being 50°. The galaxy recedes from the Milky Way at a speed of about 256 km/s. The visible radius of Dwingeloo 1 is approximately 4.2', which at the distance of 3 Mpc corresponds to about 4 kpc. The neutral hydrogen is detected as far as 6 kpc (7.5') from the center. The total mass of the galaxy is about 1/4 that of the Milky Way out to the measured distance of 6 kpc or about 31 billion Solar masses. The distribution of the neutral hydrogen in Dwingeloo 1 is typical one for barred spiral galaxies—it is rather flat with a minimum in the center or along the bar. The total mass of the neutral hydrogen is estimated at 370–450 million Solar masses. Dwingeloo 1 is a molecular gas-poor galaxy. The total mass of the molecular hydrogen does not exceed 10% of that of neutral hydrogen. Optical observations detected around 15 H II regions situated mainly along the spiral arms. In its overall size and mass, the galaxy is comparable to Triangulum Galaxy.