Geometric albedo node of their orbit, and hence lie on the ecliptic. In practice, measurements at small nonzero phase angles are used to derive the parameters which characterize the directional reflectance properties for the body (Hapke parameters). The reflectance function described by these can then be extrapolated to zero phase angle to obtain an estimate of the geometric albedo. For very bright, solid, airless objects such as Saturn's moons Enceladus and Tethys, whose total reflectance (Bond albedo) is close to one, a strong opposition effect combines with the high Bond albedo to give them a geometric albedo above unity (1.4 in the
Albedo One Fiction" 2006. "Albedo One" was voted 8th in the Nominations for the Hugo Award under the "Best Semiprozine" category for 2006. Although only the top five in the list are deemed to have earned a Nomination for the Hugo Award under this category, the event is notable as being the first time "Albedo One" has had a presence on the nominations list (and the first time an Irish genre magazine has had a presence). The event is also notable in that "Albedo One" was placed ahead of other well-known magazines such as "Lady Churchill's Rosebud Wristlet", "Postscripts" and "Apex Digest".