The quantity p is itself a (kind of) albedo since α 2 F can be seen as the intensity, scattered back towards the source, of a normally irradiated lossless (ϖ 0 =1) Lambertian disc of the same radius a...The quantity p is itself a (kind of) albedo since α 2 F can be seen as the intensity, scattered back towards the source, of a normally irradiated lossless (ϖ 0 =1) Lambertian disc of the same radius as the planet. The factor p is called the geometrical albedo. [When albedo is used without qualification in the context of the photometry of asteroids it (usually) means geometrical albedo, in particular that observed in the Johnson V-band, p V , the visual geometrical albedo].
