The objects in the Solar System with the lowest albedo are generally the asteroids. A list of a range of object in the Solar System and their geometric albedos is shown in Table \ref{tab:albedos}. The Martian satellite Phobos, a captured asteroid, is an example of such an object with a surface albedo of only 0.07. The planet with the lowest albedo in our sample is KOI 1, which has an even lower albedo than Phobos. This must be a very dark hot-Jupiter. The obtained geometric albedo of KOI 2 and KOI 13 is similar to the albedos of Mars and the Earth, respectively.

For these comparisons we have to remember that the albedos of hot-Jupiters are due to the atmosphere while for many objects in the Solar System with none or only a tiny atmosphere the measured albedo is due to the surface of the object. We notice that the three hot-Jupiters we have studied all have a lower albedo than Jupiter in the Solar System. This indicates that Jupiter might not have an atmosphere comparable to hot-Jupiters.

The highest albedo in the Solar System is found on the Saturnian moon Enceladus. This is due to the continuous renewal of fresh ice on its surface. A geometric albedo above 1 means the intensity of light scattered back is higher than is possible for any Lambertian surface. The highest geometric albedo we obtained was for KOI 72 with a geometric albedo on the order of \(10^4\). Although a geometric albedo above 1 is possible, such a high geometric albedo is unphysical and we consider this planet’s albedo unconstrainable by our model.