Comet WilsonA victory lap after its successful study of Halley’s Comet in 1985 and 1986, the Pioneer Venus Orbiter uses its unique position at the solar system’s second planet to observe another comet, the recently-discovered Comet Wilson. Spotted for the first time only the year before, little is known about Comet Wilson, a lack of data that Pioneer Venus helps to correct by imaging the comet in the ultraviolet portion of the spectrum. Pioneer Venus will also study two other comets later in 1987.