 However, subsequent investigation of the data reduction techniques used suggests that the Hipparcos measurements are not precise enough to adequately characterise the orbits of substellar companions, and the true inclination of the orbit (and hence the true mass) are regarded as unknown.Given the planet's high mass, it is likely that 47 Ursae Majoris b is a gas giant with no solid surface.Because the planet has only been detected indirectly, properties such as its radius, composition, and temperature are unknown.